Air Conditioning: 1999 Freightliner Century Series C 120 Repair: System Wiring Diagrams Print Date: 17/11/2016 [PDF]
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1999 Freightliner Century Series C120 Print Date: 17/11/2016
Repair: SYSTEM WIRING DIAGRAMS
AIR CONDITIONING Fig 1: ACPU Circuit
IGNITION FUSE 10A AF5
12V IGNIT GND J1587+ J1587 THERMOSTAT FAN REQUEST A/C CLUTCH HPX HPX RETURN LPX LPX RETURN ACPU
GND BUS
POWER DISTRIBUTION MODULE
NA3
RED
F
NCA
97B
BLK
D
NCA
GND
PNK
A
NCA
J1587+
NCA
B11
VIO
B
NCA
J1587
NCA
B4
GRN
C
NCA
97T
ORG
G
NCA
234A
BLU
E
NCA
97C
NCA
H
YEL
CLUSTER
ENGINE CONTROLS SYSTEM
(NOT USED)
YEL/BLK WHT NCA
WHT/BLK NCA
NCA
NCA
NCA
NCA A/C CLUTCH
THERMOSTAT 205804
LOW PRESSURE
HIGH PRESSURE
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Fig 2: Automatic A/C Circuit (1 of 2) HOT AT ALL TIMES
HOT AT ALL TIMES MAIN POWER DISTRIBUTION MODULE
A/C CLUTCH RELAY
F7 97T
97T
NCA
A1
H 14
98N
NCA
NCA
A2 14
NCA
NCA
98
B1 14
NCA
NCA
C1 98
NCA
MAXI FUSE 55 20A
FUSE 30A
B2
FUSE 5A
97T
NCA
97T
NCA
97T
NCA
GND
NCA
LOW
HI
BINARY SWITCH
A1
NCA
A2
NCA
A3
NCA
A4
NCA
A5
NCA
98N
A6
NCA
29A
NCA
29A
A7
NCA
GND1
NCA
GND1
A11
NCA
A12
NCA
A18
NCA
B1
NCA
B2
NCA
B3
NCA
B4
NCA
B6
NCA
B7
NCA
B8
NCA
1587
B9
NCA
1587+
B11
NCA
GND
B12
NCA
98
B19
NCA
97T
A/C CLUTCH
INTERIOR LIGHTS SYSTEM
NCA
A GND
A GND
NCA CDTC SENSOR
HVAC FRONT CONTROL
1
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
NCA
5
4
3
1
6
5
4
3
1
6
5
4
3
1
6
1
3
4
98
GND NCA 6
+
CENTER CONSOLE JUNCTION BLOCK
GND
DIM +
GND1 NCA
NCA 3
10 NCA
NCA
1587
2
NCA
1
NCA B
A
1587+
NCA
M OVERRIDE SWITCH
REC/DGA STEPPER MOTOR
MODE STEPPER MOTOR
MIX STEPPER MOTOR
MOTOR
205801
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Fig 3: Automatic A/C Circuit (2 of 2) HOT AT ALL TIMES
HOT AT ALL TIMES AUXILIARY POWER MODULE
HVAC FUSE 30A
NCA
A3
NCA
A4
NCA
A5
NCA
98T
A6
NCA
98N
A7
NCA
1587
A8
NCA
1587+
B1
NCA
98G
B2
NCA
GND
B3
NCA
GND
B4
NCA
B5
NCA
B6
NCA
B7
NCA
B8
NCA
C 98N
NCA
B 98G
NCA
A NCA
A2
98G
NCA A1
OPT HVAC FUSE 10A
HVAC FUSE 5A
98M
HVAC AUXILIARY CONTROL UNIT
GND
1587+
1587
NCA
NCA
NCA
B
C
A
NCA
NCA A
B
GND
NCA C
98T
98N
GND
98M NCA
98N NCA
B
NCA 1
A
NCA 6
98G
GND NCA 1
NCA
NCA 6
NCA
NCA 5
4
NCA 4
3
NCA 3
NCA GND
GNDF
NCA
NCA
GNDH
NCA GND
NCA
NCA
GND
1
GND
NCA
CDTC SENSOR
V1
M DRIVER APILLAR GROUND STUD
MIX STEPPER MOTOR
BLOWER MOTOR
BLOWER MOTOR CONTROL POTENTIOMETER
TEMPERATURE CONTROL POTENTIOMETER
BPILLAR JUNCTION BLOCK
205802
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Fig 4: Auxiliary A/C Circuit
GND2
A
NCA
GND2
POT (CCWCOLD)
B
NCA
98U
98U
NCA
C
POT (CENTER TAP)
C
NCA
98T
98T
NCA
B
POT (CWHOT) WV
D
NCA
98J
98J
NCA
A
E
NCA
98X
WV +
F
NCA
98W
IGN PWR 12V
G
NCA
98N
WV SOLENOID +
B
NCA
98W
WV SOLENOID
A
NCA
98X
POT (CCWCOLD) POT (CENTER TAP) POT (CWHOT) REAR CONTROL PANEL POTENTIOMETER
THERMISTER
WATER VALVE (NO)
M
AUXILIARY HVAC UNIT
POWER DISTRIBUTION SYSTEM
281869
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Fig 5: CDTC Circuit A/C MINI SWITCH
BLOWER SPEED SWITCH
E
A
NCA
B
NCA
POWER DISTRIBUTION SYSTEM
NCA
NCA 98A
98
D
C
NCA 98B
F
NCA 98C
1
NCA 98D
2
NCA 98T
FLP2 FRONT CONTROL HEAD
THERMOSTAT
C
NCA 98T
NCA 97A
B
A
NCA COLD
NCA COM
HOT
98 D
C
NCA
98A
A
NCA
98B
D
NCA
98C
B
NCA
CN3
NCA
C
COLD
NCA
B
98
NCA
G
GND
NCA
A
338W
NCA
E
NCA
F
NCA B
NCA
M A
TEMPERATURE CONTROLLER
NCA
CN2 NCA
BLOWER SCROLL
97A
ENGINE CONTROLS SYSTEM
97T
98F
98D
98F
NCA
B
A
338W NCA
338W+ NCA
GND
NCA
NCA
NCA
NCA
A
B
C
D
CONNECTOR CN1
NCA
THERMOSTAT
WATER VALVE
205803
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ANTILOCK BRAKES Fig 1: Antilock Brakes Circuit, Bendix HOT AT ALL TIMES
HOT AT ALL TIMES
CONSTANT PWR CIRCUIT BREAKER 15A
HOT IN IGNITION ON
CONSTANT PWR CIRCUIT BREAKER 15A
NCA
EXTERIOR LIGHTS SYSTEM
376C
376C*
376A
NCA
376T
376B
NCA
NCA NCA
AUXILIARY POWER DISTRIBUTION MODULE
IGN PWR CIRCUIT BREAKER 10A
A1
NCA
GND6
A2
NCA
GND5
A3
NCA
GND4
B1
NCA
376C***
B2
NCA
1922+A
B3
NCA
1922A
C1
NCA
378RF
C2
NCA
376S
NCA
378RFI
NCA
378RFO
E3
NCA
376L*
F1
NCA
378LFO
F2
NCA
376T
G1
NCA
378LFI
G2
NCA
1587+A
G3
NCA
1587A
H1
NCA
378LF
H2
NCA
377RF+
H3
NCA
377RF
J1
NCA
377LF+
J2
376A*
NCA
ATC SWITCH (W/ ATC)
GND2
NCA
376C*
NCA
376C**
NCA
376A*
NCA
85 86
30 87A
NCA NCA
GND1
ENGINE DIAGNOSTIC CONNECTOR
376A**
87
NCA
IGNITION RELAY
C3 D1 D2
376L*
NCA
376C**
NCA
85
GND3
NCA
30
376L
NCA
87A
86
D3 E1 E2
F3
NCA
377LF
K1
NCA
376R
K2
NCA
376A***
K3
NCA
376B*
NCA
378RR
NCA
378RRI
87 DIAGNOSTIC CONNECTOR
WARNING LAMP RELAY
376L
NCA
ABS WARNING LAMP
J3 RETARDER INTERRUPT CONNECTOR (OPTIONAL) 376S
NCA
EC1
A1
WHEEL SPIN LAMP (W/ ATC)
A2 A3 B1 B2
378RF
NCA
B
378RFI
NCA
C
378RFO
NCA
A
B3 C1
NCA
378RRO
D1
NCA
378LRO
D2
NCA
378T+
D3
NCA
378T
E1
NCA
378LRI
E2
NCA
377RR+
E3
NCA
377RR
C2 RIGHT FRONT MODULATOR VALVE
C3
F1
NCA
378LR
F2
NCA
377LR+
F3
NCA
377LR
WABCO CABLE
NCA
A
378LFI
NCA
C
378LF
NCA
B LEFT FRONT MODULATOR VALVE
EC2 ABS ECU
378LFO
WABCO CABLE
WABCO CABLE
WABCO CABLE
LEFT REAR WHEEL SPEED SENSOR
RIGHT REAR WHEEL SPEED SENSOR
ATC VALVE (W/ ATC)
LEFT REAR MODULATOR VALVE
377RF+
NCA
377RF
BRN
NCA BLK
377LF+
NCA
377LF
BRN
BLK
378RR
378RRI
NCA
NCA B
NCA
378RRO
C
A
378LRO
378LRI
NCA
NCA A
NCA
378LR
C
B
378T+
NCA
378T
NCA
NCA
377RR+
NCA
377RR
BRN
NCA BLK
377LR+
NCA
377LR
BRN
BLK
NCA
WABCO CABLE
RIGHT REAR MODULATOR VALVE
LEFT FRONT WHEEL SPEED SENSOR
RIGHT FRONT WHEEL SPEED SENSOR
205923
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Fig 2: Antilock Brakes Circuit, Eaton
NCA
RED NCA
BRN
RED/WHT
YEL/BLU
NCA
376E
LCO NCA
31
NCA
4A 376C
NCA
376C
NCA
NCA
1922+A
J1922 D/L+
1 3
GND GND GND J1587 D/L J1587 D/L+ WHL SPIN LT RETARDER INTERRUPT SIG TRCTR ABS IND LT SIG LEFT FWD VALVE, OUT LEFT FWD VALVE, IN LEFT FWD VALVE, GND
376L
NCA
376L
NCA
A
1922A
376L
NCA
A3
NCA
1922+A
376F
NCA
A6
1587A
NCA
B3
1587+A
NCA
B10
376S
NCA
B4
4 376T
NCA
376C
8
NCA
376B
9
NCA
376A
10
NCA
GND3
11
NCA
GND2
NCA
GNDE
12
NCA
GND1
NCA
GNDE
13
NCA
1587
14
NCA
1587+
A NCA
DATA LINK JUNCTION BLOCK
GNDE ABS GROUND
NCA
376S
17
NCA
376R
18
NCA
376L
1
NCA
378LFO
2
NCA
378LFI
3
NCA
378LF
IND 3 1708A 1708+A WHEEL SPIN WARN LT ABS WARNING LIGHTS/CLUSTER
BLU
2
BRN
3
GRN/YEL
1
15 16
TRACTOR ABS WARN LT
B
NCA
7
GNDE
6
A
B
+12V SPLY
NCA
NCA
A
+12V SPLY
NCA
GND3
2
NCA
IGN SPLY
GND3
1922A
5 ATC SW MUD/SNOW SIG
ABS CHECK SWITCH
376D
ELECTRONIC ENGINE BULKHEAD CONNECTOR J1922 D/L
POWER DISTRIBUTION MODULE
ABS TRAILER CIRCUIT BREAKER 30A
2A
NCA
NCA
30
HOT AT ALL TIMES
(OPTIONAL) ABS TRAILER CONNECTOR 5 4 3 2 1
AUXILIARY POWER MODULE
ABS BATT 1 CIRCUIT BREAKER 15A
376B
376T
NCA
NCA
2C
5B
ATC NORM/SPIN SWITCH
HOT AT ALL TIMES
ABS BATT 2 CIRCUIT BREAKER 15A
BRN/BLU
HOT AT ALL TIMES
ABS IGNITION CIRCUIT BREAKER 10A
376A
IGNITION POWER
RETARDER INTERRUPT CONNECTOR (OPTIONAL)
LH OUT LH IN LH GND LEFT FORWARD VALVE
A NCA
378
STOP LIGHT SWITCH
LEFT FWD SENSOR, HI LEFT FWD SENSOR, LO (EATON ABS)
STOP LT SIG
4
NCA
377LF+
5
NCA
377LF
6
NCA
376J
4
NCA
377RF+
5
NCA
377RF
7
NCA
378RFO
8
NCA
378RFI
9
NCA
378RF
1
NCA
378LRO
2
NCA
378LRI
3
NCA
378LR
4
NCA
378T
5
NCA
377LR+
6
NCA
377LR
7
NCA
378T+
8
NCA
377RR+
9
NCA
377RR
10
NCA
378RRO
11
NCA
378RRI
12
NCA
378RR
NCA
378
B 1 2 3
RIGHT FWD SENSOR, HI RIGHT FWD SENSOR, LO RIGHT FWD VALVE, OUT RIGHT FWD VALVE, IN RIGHT FWD VALVE, GND LEFT REAR VALVE, OUT LEFT REAR VALVE, IN LEFT REAR VALVE, GND ATC VALVE GND LEFT REAR SENSOR, HI LEFT REAR SENSOR, LO ATC VALVE PWR RIGHT REAR SENSOR, HI RIGHT REAR SENSOR, LO RIGHT REAR VALVE, OUT RIGHT REAR VALVE, IN RIGHT REAR VALVE, GND
6
C
13 14 15
205924
RIGHT REAR WHEEL SPEED SENSOR
LEFT REAR WHEEL SPEED SENSOR
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377LF+
NCA
377LF
BRN A NCA
NCA BLK B NCA
377RF+
NCA BRN A NCA
377RF
NCA BLK B NCA
378RFO
NCA
378RFI
BLU 2
NCA BRN 3
RH IN
RH OUT
378RF
NCA GRN/YEL
LEFT REAR COMB SOLENOID VALVE
RH GND
1
378LRO
NCA
378LRI
BLU 2
378LR
NCA
LH IN
BRN 3
NCA
378T
RIGHT REAR
LH OUT
ATC VALVE
LH GND
GRN/YEL 1
NCA BLK B
LO
378T+
NCA BRN A
378RRO
RH OUT
HI
NCA
378RRI
NCA
BLU 2
NCA
378RR
RH IN
BRN 3
GRN/YEL RH GND
1
377LR+
NCA BRN A NCA
377LR
NCA
377RR+
BLK B NCA
NCA BRN A NCA
NCA BLK B NCA
377RR
D ABS ECU
RIGHT FRONT ABS VALVE
RIGHT FRONT WHEEL SPEED SENSOR
LEFT FRONT WHEEL SPEED SENSOR
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Fig 3: Antilock Brakes Circuit, Rockwell WABCO
NCA
RED NCA
BRN
RED/WHT
YEL/BLU
NCA
376E
LCO NCA
31
NCA
4A 376C
NCA
376C
NCA
NCA
1922+A
J1922 D/L+
1 3
GND GND GND J1587 D/L J1587 D/L+ WHL SPIN LT RETARDER INTERRUPT SIG TRCTR ABS IND LT SIG LEFT FWD VALVE, OUT LEFT FWD VALVE, IN LEFT FWD VALVE, GND
376L
NCA
376L
NCA
A
1922A
376L
NCA
A3
NCA
1922+A
376F
NCA
A6
1587A
NCA
B3
1587+A
NCA
B10
376S
NCA
B4
4 376T
NCA
376C
8
NCA
376B
9
NCA
376A
10
NCA
GND3
11
NCA
GND2
NCA
GNDE
12
NCA
GND1
NCA
GNDE
13
NCA
1587
14
NCA
1587+
A NCA
DATA LINK JUNCTION BLOCK
GNDE ABS GROUND
NCA
376S
17
NCA
376R
18
NCA
376L
1
NCA
378LFO
2
NCA
378LFI
3
NCA
378LF
IND 3 1708A 1708+A WHEEL SPIN WARN LT ABS WARNING LIGHTS/CLUSTER
BLU
2
BRN
3
GRN/YEL
1
15 16
TRACTOR ABS WARN LT
B
NCA
7
GNDE
6
A
B
+12V SPLY
NCA
NCA
A
+12V SPLY
NCA
GND3
2
NCA
IGN SPLY
GND3
1922A
5 ATC SW MUD/SNOW SIG
ABS CHECK SWITCH
376D
ELECTRONIC ENGINE BULKHEAD CONNECTOR J1922 D/L
POWER DISTRIBUTION MODULE
ABS TRAILER CIRCUIT BREAKER 30A
2A
NCA
NCA
30
HOT AT ALL TIMES
(OPTIONAL) ABS TRAILER CONNECTOR 5 4 3 2 1
AUXILIARY POWER MODULE
ABS BATT 1 CIRCUIT BREAKER 15A
376B
376T
NCA
NCA
2C
5B
ATC NORM/SPIN SWITCH
HOT AT ALL TIMES
ABS BATT 2 CIRCUIT BREAKER 15A
BRN/BLU
HOT AT ALL TIMES
ABS IGNITION CIRCUIT BREAKER 10A
376A
IGNITION POWER
RETARDER INTERRUPT CONNECTOR (OPTIONAL)
LH OUT LH IN LH GND LEFT FORWARD VALVE
A NCA
378
STOP LIGHT SWITCH
LEFT FWD SENSOR, HI LEFT FWD SENSOR, LO (EATON ABS)
STOP LT SIG
4
NCA
377LF+
5
NCA
377LF
6
NCA
376J
4
NCA
377RF+
5
NCA
377RF
7
NCA
378RFO
8
NCA
378RFI
9
NCA
378RF
1
NCA
378LRO
2
NCA
378LRI
3
NCA
378LR
4
NCA
378T
5
NCA
377LR+
6
NCA
377LR
7
NCA
378T+
8
NCA
377RR+
9
NCA
377RR
10
NCA
378RRO
11
NCA
378RRI
12
NCA
378RR
NCA
378
B 1 2 3
RIGHT FWD SENSOR, HI RIGHT FWD SENSOR, LO RIGHT FWD VALVE, OUT RIGHT FWD VALVE, IN RIGHT FWD VALVE, GND LEFT REAR VALVE, OUT LEFT REAR VALVE, IN LEFT REAR VALVE, GND ATC VALVE GND LEFT REAR SENSOR, HI LEFT REAR SENSOR, LO ATC VALVE PWR RIGHT REAR SENSOR, HI RIGHT REAR SENSOR, LO RIGHT REAR VALVE, OUT RIGHT REAR VALVE, IN RIGHT REAR VALVE, GND
6
C
13 14 15
205924
RIGHT REAR WHEEL SPEED SENSOR
LEFT REAR WHEEL SPEED SENSOR
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377LF+
NCA
377LF
BRN A NCA
NCA BLK B NCA
377RF+
NCA BRN A NCA
377RF
NCA BLK B NCA
378RFO
NCA
378RFI
BLU 2
NCA BRN 3
RH IN
RH OUT
378RF
NCA GRN/YEL
LEFT REAR COMB SOLENOID VALVE
RH GND
1
378LRO
NCA
378LRI
BLU 2
378LR
NCA
LH IN
BRN 3
NCA
378T
RIGHT REAR
LH OUT
ATC VALVE
LH GND
GRN/YEL 1
NCA BLK B
LO
378T+
NCA BRN A
378RRO
RH OUT
HI
NCA
378RRI
NCA
BLU 2
NCA
378RR
RH IN
BRN 3
GRN/YEL RH GND
1
377LR+
NCA BRN A NCA
377LR
NCA
377RR+
BLK B NCA
NCA BRN A NCA
NCA BLK B NCA
377RR
D ABS ECU
RIGHT FRONT ABS VALVE
RIGHT FRONT WHEEL SPEED SENSOR
LEFT FRONT WHEEL SPEED SENSOR
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ANTITHEFT
SLEEPER CAB SECURITY SWITCHES
Fig 1: Antitheft Circuit 1
NCA
GND
2
NCA
GND
1
NCA
GND
2
NCA
GND2
1
NCA
GND
NCA
GND2
POWER DISTRIBUTION MODULE SECURITY LED
NCA GND2
A NCA
B
B
A
NCA
NCA
NCA
A
H
B NCA
NCA
G
F
NCA
NCA
NCA
D
E NCA
A
C
NCA
NCA
LED
LED+
46
46X
443
443
EFO
EF0
EE0
EE0
81C
81C
B2 B5 B9
GND
1
D439A
A8
NCA
2
A5
GND D439B
NCA
NCA
NCA
B
A2
2 3
NCA
GND3
4
NCA
GND2
5
NCA
UNLOCK
185
NCA
D2
46X
NCA
C1
46XY
NCA
D3
46AA
NCA
C3
GND
NCA
D1
185
NCA
D5
6 7 8
NCA
LOCK
9
NCA
LED+
10 11 GND
NCA
FLASHER
14
NCA
D439B
15
NCA
D439A
16
NCA
GND4
RELAY 6
46
NCA
C4
46A
NCA
C6
GND
NCA
D4
EF0
NCA
D8
NCA
NCA
13
46XY
NCA
C7
GND
12
185
NCA
C9
GND
NCA
D7
GND
NCA
B3
GND3
NCA
A1
108D
NCA
A3
GND
NCA
B1
EE
NCA
B6
17 18 19
NCA
LED
20 21
NCA
81C RELAY 5
22 23 24 25 26
NCA
EE
NCA
SECURITY SYSTEM ELECTRONIC CONTROL MODULE A
GND4
B
NCA
GND
PROGRAM SWITCH
NCA GND
NCA
46A
B
NCA
46AA
RELAY 1 NCA GND NCA
A
GND
SECURITY HARNESS CONNECTORS
RELAY 4
NCA GND GND
NCA
NCA
INTERIOR LIGHTS SYSTEM
NCA
GND
41
NCA
A4
108D
NCA
A6
GND
NCA
B4
EF
NCA
B8
EFP
NCA
A7
GND
NCA
B7
46A
NCA
A9
46A
NCA
108D
NCA
LOCK
A
NCA
443
G
NCA
443A
DOOR
B
NCA
443B
LOCK
D
NCA
443BB
ACTUATORS
E
NCA
443AA
RELAY 3
C5 C8
GND
ROCKWELL RELAY MODULE
C2
24A
C
A NCA
LOCK (GND) LOCK POWER
24A
UNLOCK
B NCA
24A
NCA
443A
NCA
F
A NCA
D
443B
46AA
B NCA
NCA
443A
46A
C
A NCA
EF0P
NCA
443B
GND
NCA
B NCA
UNLOCK (GND)
NCA
E
443BB
HORN (GND)
F A
RELAY 2
B NCA
FLASHER PWR
FLASHER
443AA
BATT POWER
NCA
A NCA
PRIMARY GND FLASHER PWR
B
NCA
FLASHER PWR
D6 D9 PDM RELAY MODULE
205960
MAIN SECURITY HARNESS MATING CONNECTOR
RIGHT DOOR HARNESS MATING CONNECTOR
LEFT DOOR HARNESS MATING CONNECTOR
BULKHEAD SECURITY HARNESS CONNECTOR
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COMPUTER DATA LINES Fig 1: Computer Data Lines Circuit, ICU1
NCA
1587+C
NCA
1587C
NCA
1587+E
NCA
1587E
NCA
1587+P
NCA
1587P
NCA
1587+
NCA
1587
NCA
1587+J
NCA
1587J
1587+C
NCA
B10
1587C
NCA
B3
LEFT ICU LEFT ICU INSTRUMENTATION CONTROL UNIT
1587+E
NCA
N27
NCA 27
1587E
NCA
N08
NCA
8 ENGINE ECU
DATA LINK JUNCTION BPANEL
1587+P
NCA
A
1587P
NCA
B
ACPU ECU
NCA
NCA 1587+
1587
NCA
NCA 1587+
1587
NCA
1587L
1587
NCA 1587+A
1587+L
NCA
1587A
1587+
NCA
P114
1587
NCA
NCA
1587A
NCA
P113
1587+A
NCA
NCA 1587
1587
NCA
1587+
1587+
NCA
B
1587
NCA
NCA
1587+
NCA
A
NCA
NCA
ELECTRONIC TRANSMISSION ECU
A6 NCA
1587+J
NCA
1587J
NCA
A5
DATA LINK JUNCTION BPILLAR
NCA
1587+
DIAGNOSTIC CONNECTOR
205957
DATA LOGGING UNIT
ABS ECU
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Fig 2: Computer Data Lines Circuit, ICU2L, ICU2M, ICU3
NCA
1587+C
NCA
1587C
NCA
1587C
NCA
1587+C
NCA
1587+E
NCA
1587E
NCA
1587+P
NCA
1587P
NCA
1587+
NCA
1587
NCA
1587+J
NCA
1587J
1587+C
NCA
B10
1587C
NCA
B3
1587C
NCA
1587+C
NCA
LEFT ICU LEFT ICU
A5
RIGHT ICU
A4
RIGHT ICU INSTRUMENTATION CONTROL UNIT
1587+E
NCA
N27
NCA 27
1587E
NCA
N08
NCA
8 ENGINE ECU
DATA LINK JUNCTION BPANEL
1587+P
NCA
A
1587P
NCA
B
ACPU ECU
NCA
NCA 1587+
1587
NCA
NCA 1587+
1587
NCA
1587L
1587
NCA 1587+A
1587+L
NCA
1587A
1587+
NCA
P114
1587
NCA
NCA
1587A
NCA
P113
1587+A
NCA
NCA 1587
1587
NCA
1587+
1587+
NCA
B
1587
NCA
NCA
1587+
NCA
A
NCA
NCA
ELECTRONIC TRANSMISSION ECU
A6 NCA
1587+J
NCA
1587J
NCA
A5
DATA LINK JUNCTION BPILLAR
NCA
1587+
DIAGNOSTIC CONNECTOR
205959
DATA LOGGING UNIT
ABS ECU
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CRUISE CONTROL Fig 1: Cruise Control Circuit, Caterpillar HOT IN IGNITION
HOT AT ALL TIMES
IGN CONTROLLED CB 15A
NCA
C993
A
NCA
C992
A NCA
NCA
NCA
52 A
DIAGNOSTIC CONNECTOR
B
J1587
NCA
B
A
J1587+
NCA
A
J1587+
NCA
A
J1587
NCA
B
C715
A6
AC1 C987
NCA
IGNITION SWITCH
IGN FUSE 10A
52
POWER DISTRIBUTION MODULE
JUNCTION BLOCK
SERVICE BRAKE C/O SWITCH (MAIN AIR JUNCTION BLOCK) B
NCA
C993
C A
NCA
C986
NCA
C985
J1587
NCA
B3
J1587+
NCA
B10
J1587E
NCA
B2
J1587+E
NCA
A11
C659
NCA
C16
C799
NCA
C15
THROTTLE POSITION SENSOR (ON THROTTLE PEDAL)
J1587 BUS J1587 BUS J1587 BUS J1587 BUS ENGINE PROTECTION LAMP (RED) CHK ENGINE LAMP (YEL) INSTRUMENT CLUSTER
81C
INTERIOR LIGHTS SYSTEM
NCA
9 OFF
+8V TPS SIG SERVICE BRAKE SW BATTERY (+) J1587 J1587+ CRU CTRL ON/OFF WARNING LAMP CHECK ENGINE LAMP SET RESUME +BAT EVENT RECORD CLUTCH SW J1922+ J1922 VEHICLE SPEED IN VEHICLE SPEED IN SENSOR COMMON BATTERY ()
35
NCA
C985
37
NCA
C986
14
NCA
C992
6
NCA
C987
1
NCA
C792
NCA
J1587E
7
NCA
C793
NCA
J1587+E
20
NCA
C975
27
NCA
C659
22
NCA
C799
7 29A
NCA
10 ON 8
25
NCA
C978
15
NCA
C979
4
NCA
C715
24
NCA
C977
9
NCA
C721
NCA
J1922+
3
NCA
C720
NCA
J1922
12
NCA
C785
18
NCA
C784
29
NCA
C993
5
NCA
C988
NCA
C993
NCA
2
C975
NCA
3
GND
NCA
6
C993 5 CRUISE ON/OFF SWITCH (AUX SWITCH PANEL)
40PIN
29A
NCA
INTERIOR LIGHTS SYSTEM
ENGINE CONTROL MODULE
CYL HD GND STUD A NCA
C440
NCA
C993
LOW COOLANT LEVEL PROBE
10
GND
NCA
8
C978
NCA
1
C979
NCA
3
C993
NCA
2
SET
C993 B RED
C977 NCA
NCA C BLK
A
ENGINE BRAKE CONNECTOR
RESUME CRUISE SET/RESUME SWITCH (AUX SWITCH PANEL)
WHT
SET A
RES B
COM D
PAUSE B
PAUSE A SHIFTER
C993
NCA B
9
CRUISE CONTROL SWITCH (IF EQUIPPED)
205815
NCA
7 NCA
NCA
C978
NCA
C
C979
NCA D
A
C993
C977
NCA
C993
NCA
C979
NCA
J1922+
C
J1922
NCA
B
NCA
A
VEHICLE SPEED SENSOR F DATA LINK E CONNECTOR
29A
SWITCH LIGHT GROUND
C785 C978
NCA
NCA
C784
C977
B
NCA
NCA
BLK
A
D
BLK
GND
CRUISE CONTROL CLUTCH SWITCH
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Fig 2: Cruise Control Circuit, Cummins HOT IN IGNITION POWER DISTRIBUTION MODULE
HOT AT ALL TIMES
IGN CONTROLLED CB 10A
HOT AT ALL TIMES DIAGNOSTIC CONNECTOR
FUSE 15A
B
J1587
NCA
B
A
J1587+
NCA
A
J1587+
NCA
A
J1587
NCA
B
A
NCA
NCA
NCA
NC22
NCA
NC20
NCA
(MAIN AIR JUNCTION BLOCK) SERVICE BRAKE C/O SWITCH A
NC26
AC1
FUSE 15A
JUNCTION BLOCK
N10
J1587
NCA
B3
J1587+
NCA
B10
J1587 BUS J1587 BUS
J1587E
NCA
B2
J1587+E
NCA
A11
N16
NCA
C14
STOP ENG IND (RED)
N25
NCA
C15
CHK ENGINE IND (YEL)
N01
NCA
C16
ENGINE PROT IND (RED)
J1587 BUS J1587 BUS
N13
(ON THROTTLE PEDAL) TPS/IVS NCA F
N10
E
NCA
N06
D
NCA
N09
C
NCA
N18
B A
NCA
N19
NCA
N11
INSTRUMENT CLUSTER (LEFT CLUSTER) 81C
INTERIOR LIGHTS SYSTEM
NCA
9 ON
7
TPS +5V DC VALIDATION IDLE SIG SERVICE BRAKE SW
NCA
N11
19
NCA
N19
18
NCA
N18
9
NCA
N09
6
NCA
N06
13
NCA
N13
BATT+ BATT+
STOP ENG LAMP CRUISE ON SIG CHECK ENG LAMP ENG WARN LAMP CRU SET SIG CRU RESUME SIG IDLE DECREMENT IDLE DECREMENT CLUTCH SW IN
N10
NCA
8 2
N02
NCA
3
GND
NCA
OFF
NC26
NCA
B
NCA
NC09
1
NCA
A
NCA
NC20
NCA
C
NCA
NC22
6 4 5
NCA
N08
NCA
J1587E
27
NCA
N27
NCA
J1587+E
16
NCA
N16
2
NCA
N02
29A
NCA
10
25
NCA
N25
GND
NCA
1
NCA
N01
N10
NCA
8 2
12
NCA
N12
NA16
NCA
3
22
NCA
N22
14
NCA
N14
23
NCA
N23
4
NCA
CRUISE ON/OFF SWITCH (AUX SWITCH PANEL)
CHECK ENGINE SWITCH (LEFT SWITCH PANEL)
N04
28PIN CONN
J1922
VSS INPUT SIGNAL
10
8
J1922+
VSS INPUT RET
NCA
3PIN CONN
DIAGN TEST SW
SWITCH COMMON
NCA
21PIN CONN
BATT
J1587
A
NCA
IGN INPUT
J1587+
29A
28PIN CONN
NCA
V
NCA
NA16
NCA
N
NCA
NA05
NCA
J1922+
NCA
P
NCA
NA23
NCA
J1922
29A
21PIN CONN 10
NCA
N10
7
NCA
N07
3
NCA
N03
NCA
GND
N10
TPS INPUT RET VALID OFFIDLE SIG
11
NCA
TPS INPUT SIG
INTERIOR LIGHTS SYSTEM
NCA
PANEL LIGHT GROUND 7
28PIN CONN
29A
NCA
DEC
10
ENGINE CONTROL MODULE 9 BLK
BLK
A
B
NCA
NCA
N03
N07
GND
NCA
N10
NCA
8 2
N14
NCA
3
N23
NCA
1
INC
VEHICLE SPEED SENSOR N22
N12
NCA
8
29A
NCA
10
N12
NCA
1
SET
N22
NCA NCA
3 2
RESUME
N10
9
RESUME
SET
C NCA
B RED
A NCA
BLK
SET
N10
CRUISE SET/RESUME SWITCH (AUX SWITCH PANEL) NCA
N10
WHT
A
RES B
COM D
PAUSE B
A
PAUSE
N04
CRUISE CONTROL SWITCH (IF EQUIPPED)
SHIFTER
GND NCA
NCA
7
B
C
N10 NCA A
N04 NCA
N22
N10 NCA
D
B
NCA
J1922+
NCA
NCA
C
J1922 NCA
NCA
D
F DATA LINK E CONNECTOR
A
N04
N12
IDLE INC/DEC SWITCH (LEFT SWITCH PANEL)
ENGINE BRAKE CONNECTOR 205816
CRUISE CONTROL CLUTCH SWITCH
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Fig 3: Cruise Control Circuit, Detroit Diesel HOT IN IGNITION POWER DISTRIBUTION MODULE
HOT AT ALL TIMES
IGN CONTROLLED CB 10A
HOT IN IGNITION DIAGNOSTIC CONNECTOR
NCA
A
NCA
J1587
NCA
B
J1587+
NCA
A
J1587+
NCA
A
J1587
NCA
B
81C
NCA
D240
NCA
D439
NCA
(MAIN AIR JUNCTION BLOCK) SERVICE BRAKE CUTOUT SWITCH A
B A
A
AC1
FUSE 15A
JUNCTION BLOCK
D953
D543
J1587
NCA
B3
J1587+
NCA
B10
J1587E
NCA
B2
J1587+E
NCA
A11
J1587 BUS J1587 BUS J1587 BUS J1587 BUS
A
NCA
D510
C
NCA
D916
D419
NCA
C15
CHK ENGINE (YEL)
D952
D509
NCA
C16
ENGINE PROTECTION (RED)
NCA NCA
B
NCA REMOTE TPS C A
NCA
B
NCA
INSTRUMENT CLUSTER (LEFT CLUSTER)
NCA D417
81C
THROTTLE POSITION SENSOR (ON THROTTLE PEDAL) TPS SIG TPS +5V DC TPS GND PTO/VSG SERVICE BRAKE SW IGN INPUT IGN INPUT
NCA
9 7
D2
NCA
D417
A3
NCA
D916
C3
NCA
D952
D1
NCA
D510
G2
NCA
D543
B3
NCA
D439
29A
NCA
10
D953
NCA
8 2
D544
NCA
3
GND
NCA
6
30PIN CONN C
NCA
D439
COMM CONN 5
INJECTOR GND ECM POWER ECM POWER
B
NCA
D151
A
NCA
D240
C
NCA
D241
NCA
CRUISE ON/OFF SWITCH (AUX SWITCH PANEL)
D240
ECM POWER CONN 29A
CRUISE ENABLE CHECK ENG LAMP S/D LAMP SET/ACCEL RESUME/COAST DIAG REQ S/D O/R CLUTCH SWITCH PARK BRAKE VEHICLE SPEED () VEHICLE SPEED (+) INJECTOR GROUND ECM GROUND J1922+ J1922
INTERIOR LIGHTS SYSTEM
NCA
D901
NCA
J1587E
C2
NCA
D900
NCA
J1587+E
F2
NCA
D544
B1
NCA
D419
B2
NCA
D509
J1
NCA
D541
G3
NCA
D545
G1
NCA
D528
J2
NCA
D531
29A
NCA
10
H2
NCA
D524
GND
NCA
8
E3
NCA
D557
E2
NCA
D556
GND
30PIN CONN E
NCA
D150
D
NCA
D150
NCA
SWITCH GROUND
9
NCA
D953
NCA
7 2
D528
NCA
3
NCA
ECM POWER CONN A
NCA
D800
B
NCA
D801
COMM CONN
1 NCA
D150
J1587+ DATA LINK
NCA
C1
NCA
J1587 DATA LINK
ENGINE CONTROLS SYSTEM
D953
DIAGNOSTIC REQUEST & S/D OVERRIDE (LEFT SWITCH PANEL)
ENGINE CONTROL MODULE F DATA LINK E CONNECTOR
NCA
J1922
NCA
J1922+
BLK
A
NCA
D556
BLK
B
NCA
D557
GND
NCA
8 7
D541
NCA
1
SET
D545
NCA
RESUME
D953
NCA
3 2
B RED
CRUISE CONTROL CLUTCH SWITCH
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D953
C NCA BLK
WHT
D541
CRUISE SET/RESUME SWITCH (AUX SWITCH PANEL)
D531 A NCA
A NCA D953
A NCA D524
SET
RES B
10
D953
A
PARK BRAKE CUTOUT SWITCH (MAIN AIR JUNCTION BLOCK)
NCA
NCA
D953
D545 NCA
NCA
NCA B
C
A
D531 NCA D
D545
D953 NCA
NCA
NCA B
C
COM D
PAUSE
PAUSE A
SHIFTER
205817
A
D531 NCA D CRUISE CONTROL SWITCH (IF EQUIPPED)
B
VEHICLE SPEED SENSOR
D541
9 29A
SENSOR COMMON TAP (OPTIONAL)
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Fig 4: Cruise Control Circuit, Mercedes Benz W/ Shift and Cruise Eaton (1 of 2) CRUISE ON/OFF SWITCH
HOT AT ALL TIMES
IGNITION
5
4
6 GND3
NCA
3 440D
2 440
NCA
NCA
8
10 NCA
29AC
7
9 81C
NCA
1
81C
440C
NCA
NCA
81C
440C*
NCA
NCA
A
439C
C
NCA
B
B
CIRCUIT BREAKER 15A
A
POWER DISTRIBUTION MODULE
B CLUTCH SWITCH 81C
NCA
440
NCA
GND3
NCA
1
1 CLUTCH IDLE VALID 5V GND CC SET/COAST CC RESUME/ACCEL CC ON/OFF SWITCH
2
NCA
440C
3
NCA
440G
4
NCA
440E
5
NCA
440F
6
NCA
440D 29AC
NCA
9 440E
10
NCA
11 12
A/C STATUS FAN OVERRIDE
3
7 8
SHUT DOWN OVERRIDE
2
13
NCA
440U
14
NCA
440Y
15
NCA
440Z
1
NCA
439B
2
NCA
439A
3
440F
NCA
440U
NCA
440Z
NCA
440H
NCA
431C
NCA
440A
NCA
440G
NCA
16
4 5 6 7 8
17 18 VC3
NCA
440V1
440V1
NCA
13
NCA
440V2
440V2
NCA
14
NCA
440P
440P
NCA
15
NCA
440B
440P
NCA
16 17
NCA
1587+E
(OR J1587+)
A
18
NCA
1587E
NCA
J1939+
(OR J1587) 2
B
19 20 21
NCA
J1939
NCA
439N
4
DATA LINK CONNECTOR
DIAGNOSTIC CONNECTOR
B
NCA
C
GND
NCA
A 440D
NCA
439N
NCA
440L
NCA
439S+
440F
NCA
4
NCA
439S
440E
NCA
5
440
NCA
6
12D
NCA
440C*
NCA
440
NCA
120D
NCA
7
NCA
440L
8 9
NCA
431D
10
NCA
431B
NCA
439D+
NCA
439D
12 13 14 15 16 17 18
GND
NCA
A
97C
NCA
B
30
NCA
A
30G
NCA
B
19 20 21 22 23 24 25 26 27 28
11 NCA 439C
13 14 15
A/C COMPRESSOR
VEHICLE SPEED SENSOR
472M
472L
NCA
NCA G
30G NCA
F
30 NCA
E
97C NCA C
D
120B NCA B
12D NCA
472K
A
440
NCA
FRONTWALL HARNESS
H
G
439L
NCA F
440Y NCA
439L
NCA
E
NCA
D
C
NCA 439C 6
BAT POWER
NCA GNDE 11 NCA GNDE
ECU GND
NCA 439D+ 1
9
ECU GND
VCU/PDU CAN LOW
VCU/PDU CAN HIGH
439S+
BLK
2
NCA 439D
NCA B
439S
VC4
BLK 205818
D
NCA
439A
NCA
A
VEHICLE CONTROL UNIT
NCA
431B
3
NCA
VUC/PDU CAN LOW
NCA
431D
2
12 VUC/PDU CAN HIGH
GND
ENGINE BLOCK
VC1 1
11
AIR INTAKE HEATER
472J
GRID HTR/FLAME STRT
12
472H
FLAME STRT FUEL VLV
NCA
NCA
COOLANT LEVEL
440T
NCA
VSS GND
440T
B
VSS SIGNAL
NCA
A
TRANS SW NEUTRAL
11
55PIN CONN
J1939
NCA
40 NCA 472M
J1587 J1939+
440P+
439A
J1587+
440P+
10
51 NCA 472J 42 NCA 472L
SERVICE BRAKE
NCA
9
NCA
TPS SENSOR COMMON
8
43 NCA 439L+ 12 NCA 472H
IDLE VALIDATE SW2
431C
41 NCA 439L+
IDLE VALIDATE SW1
440A
NCA
11 NCA 472K
TPS SIGNAL
NCA
7
17PIN CONN
TPS PWR
440H
6
NCA 439C
PREHTR IND LP SIG
440
NCA
IGN PWR
STOP ENG CHECK ENG
NCA
5
9 10
4
15 NCA 439A
SENSOR COMMON
POWER DISTRIBUTION SYSTEM
439A
NCA
5
SWITCHED BATT +
POWER DISTRIBUTION SYSTEM
BAT POWER
UN SW BAT+
TRANSMISSION TEMPERATURE SENSOR
FRONTWALL HARNESS CONNECTOR
ENGINE CONTROL MODULE
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Fig 5: Cruise Control Circuit, Mercedes Benz W/ Shift and Cruise Eaton (2 of 2) FAN SWITCH
ON
SENSOR COMMON SPLICE PACK
OFF
3
4 5 6 7 8
9 10
81C
NCA
440
NCA
A
C
B
NCA
NCA
NCA
440
440
5
4
6 GND4
1
NCA
3 440Z
2 440
NCA
8
NCA
29AF
7
10 NCA
81C
NCA
NCA
29AF
NCA
29AB
9 2
NCA
GND2
NCA 1
440
INTERIOR LIGHTS SYSTEM
2
440
NCA
GND3
GND7
NCA
8
NCA
29AC
29AD
NCA
10
NCA
440E
440E
NCA
1
SET
NCA
440F
440F
NCA
3
RESUME
NCA
440U
NCA
440Z
NCA
440H
7 9
NCA
CRUISE SET/RESUME SWITCH (AUX SWITCH PANEL)
440H
431C
431C
NCA
C14
NCA
LC2 C6
STOP ENGINE IND GRID HEATER IND
LC1 440A
NCA
CHK ENGINE IND
C15 LC2
11 12 13 14 15 16 17 18
NCA
440A
NCA
440G
NCA
440P+
NCA
440T
NCA
440V1
NCA NCA NCA
440P
INSTRUMENT CLUSTER 440G
NCA
F
440V1
NCA
D
440V2
440V2
NCA
E
440P
440T
NCA
A
440P+
NCA
C
440P
NCA
B
NCA
B
TPS
120D
THROTTLE PEDAL
12D
NCA
A
IVS
7
23 24 25 26 27
440L
NCA
440F
NCA
440E
NCA
440
NCA
12D
NCA
440C*
NCA
440
NCA
120D
RESUME INTERIOR LIGHTS SYSTEM
29AE
NCA
10
GND5
NCA
8
SET
1
440U
NCA
3
NCA
2
440 NCA 440
28
439N
NCA
440
22
NCA
440
21
NCA
20
9
NCA
19
A/C COMPRESSOR NCA 440D
36G
36G
NCA
NCA
NCA
36G
B NCA
36G
A NCA
36
87A
440B
NCA 30
36G
NCA
NCA
440
GND
85
86
87
NCA
NCA
440L
NCA A
440
NCA B
440F
440E
NCA
NCA E
F
440D
440
NCA
440
NCA B
A
NCA D
440K
NCA E
440J
440J
NCA
440K
NCA
NCA F
12
439N
13
27
NCA
NCA
SHUTDOWN O/R
SERVICE BRAKE SWITCH
ENGINE FRONTWALL CONNECTOR
SHIFTER ENGINE BRAKE SWITCH
EATON SHIFTER KNOB
LOW COOLANT LEVEL
SERVICE BRAKE RELAY
BRAKE SWITCH
SERVICE BRAKE
205819
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Fig 6: Cruise Control Circuit, Mercedes Benz W/ Shift and Cruise Meritor (1 of 2) CRUISE ON/OFF SWITCH
HOT AT ALL TIMES
IGNITION POWER DISTRIBUTION MODULE
4
5
GND3
6
1 440D
NCA
2
3 440
NCA
8
NCA
81C
NCA
29AC
NCA
81C
NCA
81C
7
440C
10
440C*
NCA
NCA
NCA
A
9
C
439C
NCA
B
A
B
CIRCUIT BREAKER 15A
B CLUTCH SWITCH 81C
NCA
1
1 CLUTCH IDLE VALID 5V GND CC SET/COAST CC RESUME/ACCEL CC ON/OFF SWITCH
2
NCA
440C
3
NCA
440G
4
NCA
440E
5
NCA
440F
6
NCA
440D
440
NCA
GND3
NCA
29AC
NCA
9 440E
10
NCA
11 12
A/C STATUS FAN OVERRIDE
3
7 8
SHUT DOWN OVERRIDE
2
13
NCA
440U
14
NCA
440Y
15
NCA
440Z
1
NCA
439B
2
NCA
439A
3
440F
NCA
440U
NCA
440Z
NCA
16
4 5 6 7 8
17 18 VC3
SENSOR COMMON STOP ENG CHECK ENG PREHTR IND LP SIG TPS PWR TPS SIGNAL IDLE VALIDATE SW1 IDLE VALIDATE SW2 TPS SENSOR COMMON SERVICE BRAKE J1587+ J1587 J1939+ J1939
TRANS SW NEUTRAL VSS SIGNAL VSS GND
NCA
440
5
NCA
440H
6
NCA
440A
7
NCA
431C
POWER DISTRIBUTION SYSTEM
439A
NCA
8
440P+
NCA
440T
440T
NCA
12
NCA
440V1
440V1
NCA
13
NCA
440V2
440V2
NCA
14
NCA
440P
440P
NCA
15
NCA
440B
440P
NCA
16 17
NCA
1587+E
(OR J1587+)
A
18
NCA
1587E
(OR J1587)
B
19
NCA
J1939+
2
20 21
NCA
J1939
NCA
439N
4
AIR INTAKE HEATER
DATA LINK CONNECTOR
DIAGNOSTIC CONNECTOR
1
GND
ENGINE BLOCK
VC1
NCA
431D
NCA
431B
NCA
B
439A
NCA
C
NCA
A
GND
440D
NCA
439N
NCA
440L
NCA
3
NCA
439S+
440F
NCA
4
NCA
439S
440E
NCA
440
NCA
12D
NCA
NCA
440L
440C*
NCA
440
NCA
9
NCA
431D
120D
NCA
10
NCA
431B
NCA
439D+
NCA
439D
5 7 8
11 12 13 14 15 16 17 18
GND
NCA
A
97C
NCA
B
19 20 21 22 23 24 25 26 27 28
11 NCA 439C
13 14 15
A/C COMPRESSOR
30
30G
472M
472L
NCA
NCA
NCA
E
F
G
97C NCA C
NCA
120B NCA
D
12D NCA
472K
B
440
NCA G
A
440Y
NCA F
FRONTWALL HARNESS
H
439L
NCA
439L
NCA
NCA C
E
472J NCA B
D
472H NCA A
55PIN CONN
40 NCA 472M
42 NCA 472L
51 NCA 472J
12 NCA 472H
43 NCA 439L+
41 NCA 439L+
11 NCA 472K
NCA 439C
17PIN CONN
IGN PWR
15 NCA 439A
NCA GNDE
NCA 439D+
NCA 439C
BAT POWER
6
9
1
11 NCA GNDE
ECU GND
ECU GND
VCU/PDU CAN LOW
VCU/PDU CAN HIGH
439S+
BLK
BLK
2
NCA 439D
NCA B
439S
VC4
VEHICLE SPEED SENSOR 207746
9 10
D
2
A
VEHICLE CONTROL UNIT
NCA
440P+
NCA
VUC/PDU CAN LOW
NCA
440G
NCA
12 VUC/PDU CAN HIGH
440A
NCA
5
GRID HTR/FLAME STRT
NCA
10
BAT POWER
FLAME STRT FUEL VLV
NCA
11
9
6 COOLANT LEVEL
440H 431C
4
439A
SWITCHED BATT +
POWER DISTRIBUTION SYSTEM
NCA
UN SW BAT+
30
NCA
A
30G
NCA
B TRANSMISSION TEMPERATURE SENSOR
FRONTWALL HARNESS CONNECTOR
ENGINE CONTROL MODULE
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Fig 7: Cruise Control Circuit, Mercedes Benz W/ Shift and Cruise Meritor (2 of 2) FAN SWITCH
ON
SENSOR COMMON SPLICE PACK
OFF
3
4 5 6 7 8
9 10
A
C
B
NCA
NCA
NCA
440
440
4
5
440
NCA
440Z
GND4
6
1
2
3 440
NCA
7
8
NCA
29AF
NCA
81C
NCA
NCA
29AF
NCA
29AB
9 2
GND2
NCA 1
10
INTERIOR LIGHTS SYSTEM
NCA
81C
NCA
440
440
NCA
2
NCA
GND3
GND7
NCA
8
NCA
29AC
29AD
NCA
NCA
440E
440E
NCA
1
SET
NCA
440F
440F
NCA
3
RESUME
NCA
440U
NCA
440Z
NCA
440H
7 9
NCA
10
CRUISE SET/RESUME SWITCH (AUX SWITCH PANEL)
440H
431C
431C
NCA
C14
NCA
LC2 C6
STOP ENGINE IND GRID HEATER IND
LC1 440A
NCA
CHK ENGINE IND
C15 LC2
11 12 13 14 15 16 17 18
NCA
440A
NCA
440G
NCA
440P+
NCA
440T
NCA
440V1
NCA NCA NCA
440P
INSTRUMENT CLUSTER 440G
NCA
F
440V1
NCA
D
440V2
440V2
NCA
E
440P
440T
NCA
A
440P+
NCA
C
440P
NCA
B
ENGINE FRONTWALL CONNECTOR
27
2
NCA
IVS
TPS
439N
NCA
440D
THROTTLE PEDAL 7 9
26 27
440
NCA
12D
NCA
440C*
NCA
440
NCA
120D
440
440E
NCA
NCA
NCA
RESUME INTERIOR LIGHTS SYSTEM
29AE
NCA
10
GND5
NCA
8
SET
1 NCA
440 440U
NCA
3
NCA
2
440 SHUTDOWN O/R
RES
SHIFTER (IF EQUIPPED)
36G
36G
NCA
NCA
NCA
36G
B NCA
36G
A NCA
36
87A
440B
NCA 30
36G
NCA
NCA
GND
85
440
NCA 87
86
NCA SERVICE BRAKE SWITCH
COM A/C COMPRESSOR
440L
NCA A
440
NCA B
440
NCA D
C
B SET
440F
NCA
440E
NCA
440
NCA
PAUSE
A
440C*
A
NCA B
12D
120D
NCA A
B
NCA
NCA
NCA 440
28
440F
440
25
440L
NCA
NCA
24
439N
NCA
440F
22 23
440D
NCA
NCA
21
NCA
440E
20
NCA
19
LOW COOLANT LEVEL
SERVICE BRAKE RELAY
BRAKE SWITCH
SERVICE BRAKE
207747
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Fig 8: Cruise Control Circuit, Mercedes Benz W/O Shift and Cruise (1 of 2) CRUISE ON/OFF SWITCH
HOT AT ALL TIMES
IGNITION POWER DISTRIBUTION MODULE
4
5
GND3
1
6 NCA
440D
NCA
3
2 440
8
NCA
81C
NCA
29AC
NCA
81C
NCA
81C
7
440C
10
440C*
NCA
NCA
NCA
A
9
C
439C
NCA
B
A
B
CIRCUIT BREAKER 15A
B CLUTCH SWITCH 81C
NCA
1
1 CLUTCH IDLE VALID 5V GND CC SET/COAST CC RESUME/ACCEL CC ON/OFF SWITCH
2
NCA
440C
3
NCA
440G
4
NCA
440E
5
NCA
440F
6
NCA
440D
440
NCA
GND3
NCA
29AC
NCA
9 440E
10
NCA
11 12
A/C STATUS FAN OVERRIDE
3
7 8
SHUT DOWN OVERRIDE
2
13
NCA
440U
14
NCA
440Y
15
NCA
440Z
1
NCA
439B
2
NCA
439A
3
440F
NCA
440U
NCA
440Z
NCA
16
4 5 6 7 8
17 18 VC3
SENSOR COMMON STOP ENG CHECK ENG PREHTR IND LP SIG TPS PWR TPS SIGNAL IDLE VALIDATE SW1 IDLE VALIDATE SW2 TPS SENSOR COMMON SERVICE BRAKE J1587+ J1587 J1939+ J1939
TRANS SW NEUTRAL VSS SIGNAL VSS GND
NCA
440
5
NCA
440H
6
NCA
440A
7
NCA
431C
POWER DISTRIBUTION SYSTEM
439A
NCA
8
440P+
NCA
440T
440T
NCA
12
NCA
440V1
440V1
NCA
13
NCA
440V2
440V2
NCA
14
NCA
440P
440P
NCA
15
NCA
440B
440P
NCA
16 17
NCA
1587+E
(OR J1587+)
A
18
NCA
1587E
(OR J1587)
B
19
NCA
J1939+
2
20 21
NCA
J1939
NCA
439N
4
AIR INTAKE HEATER
DATA LINK CONNECTOR
DIAGNOSTIC CONNECTOR
1
GND
ENGINE BLOCK
VC1
NCA
431D
NCA
431B
NCA
B
439A
NCA
C
NCA
A
GND
440D
NCA
439N
NCA
440L
NCA
3
NCA
439S+
440F
NCA
4
NCA
439S
440E
NCA
440
NCA
12D
NCA
NCA
440L
440C*
NCA
440
NCA
9
NCA
431D
120D
NCA
10
NCA
431B
NCA
439D+
NCA
439D
5 7 8
11 12 13 14 15 16 17 18
GND
NCA
A
97C
NCA
B
19 20 21 22 23 24 25 26 27 28
11 NCA 439C
13 14 15
A/C COMPRESSOR
30
30G
472M
472L
NCA
NCA
NCA
E
F
G
97C NCA C
NCA
120B NCA
D
12D NCA
472K NCA G
B
440 NCA
A
440Y NCA
FRONTWALL HARNESS
H
439L NCA
F
439L NCA C
E
472J NCA B
D
472H NCA A
55PIN CONN
40 NCA 472M
42 NCA 472L
51 NCA 472J
12 NCA 472H
43 NCA 439L+
41 NCA 439L+
11 NCA 472K
NCA 439C
17PIN CONN
IGN PWR
NCA 439C
NCA GNDE
15 NCA 439A
6
ECU GND
BAT POWER
NCA 439D+
NCA 439D
11 NCA GNDE
1
2
9
ECU GND
VCU/PDU CAN LOW
BLK
BLK
VCU/PDU CAN HIGH
439S+
NCA B
439S
VC4
VEHICLE SPEED SENSOR 207740
9 10
D
2
A
VEHICLE CONTROL UNIT
NCA
440P+
NCA
VUC/PDU CAN LOW
NCA
440G
NCA
12 VUC/PDU CAN HIGH
440A
NCA
5
GRID HTR/FLAME STRT
NCA
10
BAT POWER
FLAME STRT FUEL VLV
NCA
11
9
6 COOLANT LEVEL
440H 431C
4
439A
SWITCHED BATT +
POWER DISTRIBUTION SYSTEM
NCA
UN SW BAT+
30
NCA
A
30G
NCA
B TRANSMISSION TEMPERATURE SENSOR
FRONTWALL HARNESS CONNECTOR
ENGINE CONTROL MODULE
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Fig 9: Cruise Control Circuit, Mercedes Benz W/O Shift and Cruise (2 of 2) FAN SWITCH
ON
SENSOR COMMON SPLICE PACK
OFF
3
4 5 6 7 8
9 10
A
C
B
NCA
NCA
NCA
440
440
4
5
440
NCA
440Z
GND4
6
1
2
8
3 440
NCA
NCA
29AF
7
NCA
81C
NCA
NCA
29AF
NCA
29AB
9 2
GND2
NCA 1
10
INTERIOR LIGHTS SYSTEM
NCA
81C
NCA
440
440
NCA
2
NCA
GND3
GND7
NCA
8
NCA
29AC
29AD
NCA
NCA
440E
440E
NCA
1
SET
NCA
440F
440F
NCA
3
RESUME
NCA
440U
NCA
440Z
NCA
440H
7 9
NCA
10
CRUISE SET/RESUME SWITCH (AUX SWITCH PANEL)
440H
431C
431C
NCA
C14
NCA
LC2 C6
STOP ENGINE IND GRID HEATER IND
LC1 440A
NCA
CHK ENGINE IND
C15 LC2
11 12 13 14 15 16 17 18
NCA
440A
NCA
440G
NCA
440P+
NCA
440T
NCA
440V1
NCA NCA NCA
440P
INSTRUMENT CLUSTER 440G
NCA
F
440V1
NCA
D
440V2
440V2
NCA
E
440P
440T
NCA
A
440P+
NCA
C
440P
NCA
B
IVS
TPS
THROTTLE PEDAL 7 9
24 25 26 27
440L
NCA
440F
NCA
440E
NCA
440
NCA
12D
NCA
440C*
NCA
440
NCA
120D
RESUME INTERIOR LIGHTS SYSTEM
29AE
NCA
10
GND5
NCA
8
SET
1
440U
NCA
3
NCA
2
440 SHUTDOWN O/R
36G
36G
NCA
NCA
NCA
36G
B NCA
36G
A NCA
36
87A
440B
NCA 30
36G
NCA
NCA
GND
85
440
NCA 87
86
NCA
440L
NCA A
440
NCA B
12D
120D
NCA A
NCA B
440D
439N
NCA
440F
NCA
440E
NCA 2
27
4
3
NCA
NCA
NCA 440
28
439N
NCA
440
22 23
440D
NCA
440
21
NCA
NCA
20
NCA
19
SERVICE BRAKE SWITCH
ENGINE FRONTWALL CONNECTOR A/C COMPRESSOR
LOW COOLANT LEVEL
SERVICE BRAKE RELAY
BRAKE SWITCH
SERVICE BRAKE
207741
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ELECTRONIC SUSPENSION Fig 1: Electronic Suspension Circuit IGNITION
ECAS AUTO LOAD TRANSFER OFF INDICATOR LIGHT (AMBER LENS) (CENTER GAUGE PANEL) BLK NCA A
BLK NCA B
GND
434B
81C
NCA B
81C
NCA
434
NCA
NCA A
BLK
ECAS SYSTEM FAIL INDICATOR LIGHT (RED LENS) (CENTER GAUGE PANEL)
IGN SUPPLIED CB 500MA
BLK
CONSTANT PWR CB 15A
434C
HOT AT ALL TIMES
NCA
NCA
434A
1
NCA
434
2
NCA
J1587+
NCA
A
NCA
J1587
NCA
B
NCA
434A
NCA
81C
81C
81C
NCA
81C
NCA
NCA
STOPLIGHT SWITCH (AIR/OIL JUNCTION BLOCK)
3 4
DIAGNOSTIC CONNECTOR
5 6 7 8 9 10 11 12 NCA
434F 434F
NCA
3
15
NCA
434G
434G
NCA
2
16
NCA
434M
434H
NCA
1
17
NCA
434N
GND
NCA
4
20
NCA
434K
21
NCA
434E
81C
NCA
E
22
NCA
434L 434M
NCA
B
X12
NCA
A
13 14
18 19
SOLENOID VALVE
23 24 25
NCA
434J
NCA
GND
NCA
434H
26 27
C
28 D
29 30 31
434C
NCA
F
32 33
NCA
434B
NCA
434D
ECAS AUTO LOAD TRANSFER ON/OFF SWITCH (SWITCH PANEL)
34 35 ECAS ECU
CLOCK DATA IGN PWR GND
3 NCA
434D
4 NCA
434E
1 NCA
81C
2 NCA
GND
DISTANCE SENSOR
X12
NCA 12
GND NCA
LOAD TRANSFER MOMENTARYON SWITCH (SWITCH PANEL)
GND
434J NCA
1
NCA
GND NCA
2
A
434N C NCA
434K NCA
SPEED SIGNAL SENDER
B NCA
434L NCA
HAND CONTROL RECEPTACLE ASSY
ABS ECU
205997
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ENGINE ACCESSORIES Fig 1: Engine Brake Circuit
INTERIOR LIGHTS SYSTEM (INSTRUMENT ILLUMINATION)
81C
NCA
CATERPILLAR
ENGINE CONTROL MODULE
DETROIT DIESEL
CATERPILLAR
DETROIT DIESEL
NCA
9
7
NCA
NCA
5
NCA
NCA
6
NCA
NCA
4
NCA
NCA
K2
13
NCA
C717
D583
NCA
3
NCA
NCA
K3
19
NCA
C716
D979
NCA
1
NCA
NCA
C993
D953
NCA
2
NCA
29A
NCA
8
NCA
GND
NCA
10
NCA
SENSOR COMMON
INTERIOR LIGHTS SYSTEM (INSTRUMENT ILLUMINATION)
205998
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ENGINE BRAKE SWITCH
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Fig 2: Low Coolant Level Circuit, W/ Cummins or Caterpillar Engines
NCA
C997
NCA
C983
NCA
C993
A
NCA
C984
CATERPILLAR ENGINES L+5V
NCA
A
NCA
PROB
B
NCA
LNOR
LNOR
NCA
C
NCA
C971
C
NCA
LGND
LGND
NCA
A
NCA
C745
D
NCA
LLOW
LLOW
NCA
B
E
NCA
L+5V 234R
NCA
E
234F
NCA
F
NCA
NA22
NCA
NA18
NCA
NA13
NCA
NA09
NCA
NA08
NCA
NC07
LCL MODULE FRONTWALL HARNESS A
NCA
PROB
B
NCA
LGND
LCL PROBE CUMMINS ENGINES
CATERPILLAR ENGINE HARNESS
CUMMINS ENGINE HARNESS
205407
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Fig 3: Low Coolant Level Circuit, W/ Detroit Diesel Engines
LCL PROBE
A
NCA
D115
B
NCA
D953
FRONTWALL HARNESS
D953
NCA
A
NCA
D953
D115
NCA
D
NCA
D115
234R
NCA
E
NCA
D542
234F
NCA
F
NCA
D555
DETROIT DIESEL ENGINE HARNESS
205413
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ENGINE PERFORMANCE For engine performance wiring diagrams, see ENGINE PERFORMANCE WIRING DIAGRAMS article.
EXTERIOR LIGHTS Fig 1: Backup Lamps Circuit
HOT IN ON BACKUP 10A
POWER DISTRIBUTION MODULE
NF5 NCA
120
BACKUP LAMP SWITCH
NCA 120B
NCA 120B
NCA 120B BACKUP LAMP
NCA
BACKUP LAMP
NCA
207588
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Fig 2: Exterior Lamps Circuit HOT AT ALL TIMES FLASHER UNIT
HOT AT ALL TIMES
TURN SIGNAL CIRCUIT BREAKER 20A
STOPLIGHT CIRCUIT BREAKER 25A
TRAILER MRKR TAIL 30A
85
30
86
87
HOT AT ALL TIMES
HOT IN ON & ACC
ACC POWER BREAKER 15A
TRAILER TAIL MINI RELAY
85
86
HOT AT ALL TIMES
TRAILER MRKR BREAKER 30A
30
87
HOT AT ALL TIMES
TRACTOR TAIL BREAKER 15A
TRAILER MRKR MINI RELAY
AF2
AA5
NF6
AB7
NA2
AD2
NCA 36
NCA 23A
NCA 29C
NCA 16A
NCA 20A
AE3
TRACTOR TAIL/MRKR MICRO RELAY
3
1
NCA 38A
4
5
2
EH0
NC5
NC7
NCA 46 NCA 46
POWER DISTRIBUTION MODULE
LEFT HEADLIGHT BREAKER 15A
NC6
NC8
NCA 46E
AD3
AE1 NCA 20
NCA 46F
NCA 23F
NCA 23D
NCA 23
BRAKE LIGHT SWITCH
20A
NCA 36B
NCA HEADLIGHT SWITCH
PANEL DIMMER
NCA
38A
NCA
36A
23D
NCA
INTERRUPT SWITCH NCA K1
23A 16A
NCA
A3
36B
NCA
K2
38R
NCA
K3
38L
NCA
B4
7 WAY CONNECTOR
NCA
39L
NCA
38L
NCA
NCA
38R
NCA
RHB1
38L
NCA
LHC8
INSTRUMENTATION CONTROL UNIT 38L
NCA
K
38R
NCA
F
379R
NCA
E
379L
NCA
A
39R
38R
DRL MODULE
TURN SIGNAL SWITCH
46E
NCA
46F
NCA
LEFT DOOR MARKER LIGHT
NCA
379R RIGHT DOOR MARKER LIGHT
NCA NCA
23
RIGHT DRL PARK LIGHT
46
NCA
NCA
NCA
NCA
46
NCA
NCA
46
NCA
NCA
46
NCA
NCA
46
NCA
NCA
23
NCA NCA
46
379L
LEFT DRL PARK LIGHT
RIGHT FRONT TURN PARK LIGHT
NCA NCA
LEFT FRONT TURN PARK LIGHT
NCA
NCA NCA
NCA
LEFT TAIL LIGHT NCA
NCA 46
NCA 46
NCA 23
LEFT REAR STOP TURN TAIL LIGHT
NCA 23
NCA 39L
RIGHT REAR STOP TURN TAIL LIGHT
NCA 23
NCA 23
NCA 39R
NCA 38L
NCA 23
NCA 23
NCA 38R
CAB MARKER LIGHTS
RIGHT TAIL LIGHT NCA
NCA
SIDE MARKER LIGHT NCA
SIDE MARKER LIGHT NCA
NCA
205917
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HEADLIGHTS Fig 1: Headlights Circuit
INFO NOT AVAILABLE
23D
NCA
382
GRY
30 86 87A 87
BLK
85
GND
TTRM & T RELAY
A
BLK
GND
B
BLU
383
C
PPL
222
D
WHT
386
E
YEL
387
F
BRN
379
G
GRY
382
H
RED
381
RED
381
NCA
20
NCA
29D
NCA
20
NCA
359
NCA
20L
E
NCA
20A
F
NCA
20R
NCA
20A
INFO NOT AVAILABLE
29D
NCA
383
BLU
30 86 87A 87
29D
NCA
85
DRL MODULE
PNL LAMPS RELAY
379
BRN
A B C
NCA PARK BRAKE SWITCH
INFO NOT AVAILABLE
D
RIGHT SWITCH PANEL
E4
NCA
NCA
E3
22D
INFO NOT AVAILABLE
29D
NCA
20R
NCA
INFO NOT AVAILABLE
71
NCA
22D
NCA
387
YEL
21D
NCA
21D
222
PPL
222
NCA
30 86 87A 87 85 RIGHT HEADLAMP RELAY
INFO NOT AVAILABLE
E2
NCA
E1
NCA
INFO NOT AVAILABLE
22 21
BULKHEAD CONNECTOR
23D
NCA
20L
NCA
71
NCA
71
NCA
22
NCA
386
WHT
21
NCA
21B
NCA
222
NCA
222
NCA
30 86 87A 87 85 LEFT HEADLAMP RELAY
10B
C16
NCA
21B
222
NCA
L
C1 LIGHTBAR/ IE CLUSTER
VIGIL/KYSOR
TURN SIGNAL SWITCH
1E CLUSTER
281872
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Fig 2: Headlights Circuit, W/ DRL HOT AT ALL TIMES
HOT IN RUN OR ACC
HOT AT ALL TIMES POWER DISTRIBUTION MODULE
ACC POWER CIRCUIT BREAKER 15A
1
3
379A
NCA
NCA
AF1
LE0
4 21L
NCA
ND7
5 21H
NCA
CF0 379D
NCA
AB6 21A
NCA
NB8
2
RIGHT HEADLIGHT MICRO RELAY
4 NC3 20L
NCA
NE1 20H
NCA
AB5 20H
NCA
20D
AD7 NCA
CA0 379C
NCA
AD2 NCA
20A
AE1 NCA
20
AD4 21
5
2
LEFT HEADLIGHT MICRO RELAY
NCA
DRL CIRCUIT BREAKER 10A
3
CLUSTER CIRCUIT BREAKER 10A
379
LEFT HEADLIGHT CIRCUIT BREAKER 15A
1
RIGHT HEADLIGHT CIRCUIT BREAKER 15A
20A
NCA
DIMMER SWITCH
NCA
RHB2
21A
NCA
HEADLIGHT SWITCH
HIGH BEAM INDICATOR LIGHT
379
C
NCA
379B
B
NCA
GND
A
NCA
379L
EXTERIOR LIGHTS SYSTEM
NCA
NCA
379L
NCA
DRL MODULE
RIGHT SIDE DRL
PARKING BRAKE SWITCH
LEFT HEADLIGHT
RIGHT HEADLIGHT
NCA
NCA
NCA
NCA
NCA
LEFT SIDE DRL
21L
NCA
NCA
D
EXTERIOR LIGHTS SYSTEM
21H
379R
NCA
NCA
NCA
38R
E
20L
NCA
NCA
379A
F
20H
NCA
NCA
379D
G
NCA
379C
NCA
379B
NCA
H
NCA
J
EXTERIOR LIGHTS SYSTEM
379R
38L
NCA
NCA
NCA
K
205906
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Fig 3: Headlights Circuit, W/O DRL HOT AT ALL TIMES
POWER DISTRIBUTION MODULE
HOT IN RUN OR ACC
1
3
LEFT HEADLIGHT CIRCUIT BREAKER 15A
1
RIGHT HEADLIGHT CIRCUIT BREAKER 15A
3
ACC POWER CIRCUIT BREAKER 15A
4 ND7
5 NCA
21H
NCA
21L
NCA
21H
NCA
21L
AB6 21A
NCA
AD2 20A
20L 20L
NCA
NCA NCA
NB8
4 NC3
5 20H 20H
NE1 NCA NCA
AB5 20H
RHB2
20A
RIGHT HEADLIGHT ASSEMBLY
GND1
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NCA
NCA
LEFT HEADLIGHT ASSEMBLY
NCA
NCA
21A
HIGH BEAM INDICATOR LIGHT
DIMMER SWITCH
205907
NCA
AD7 NCA
20D
AE1 NCA
20
AD4 21
NCA
NCA
HEADLIGHT SWITCH
2
RIGHT HEADLIGHT MICRO RELAY 2
LEFT HEADLIGHT MICRO RELAY
GND4
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HORN Fig 1: Horn Circuit
HOT AT ALL TIMES HORN CIRCUIT BREAKER 15A
POWER DISTRIBUTION MODULE
D8 NCA 24
NCA 26 B ELECTRONIC HORN
A NCA 25
NCA 24A A HORN BUTTON ASSEMBLY
205992
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INSTRUMENT CLUSTER Fig 1: Clock Circuit
HOT AT ALL TIMES CIRCUIT BREAKER 16 10A
POWER DISTRIBUTION MODULE
A
NCA
172
B
NCA
GND
C
NCA
172
NCA
AA4
INTERIOR LIGHTS SYSTEM
D
NCA GND
OVERHEAD CLOCK
205878
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Fig 2: Data Logging Circuit
NCA
HOT AT ALL TIMES
442
NCA
HOT IN IGNITION
442A
NCA
NCA
BPILLAR JUNCTION BLOCK
A1 A2 A3 A4
NCA
GND
A5
NCA
J1587
A6
NCA
A7
NCA
442B
A8
NCA
442A
A9
NCA
15A
A11
NCA
GNDE
A12
NCA
442
442B
STARTER
A10
NCA
A2
INSTRUMENTATION CONTROL UNIT
NCA 205938
GROUND (LEFT CORNER OF CAB FLOOR)
GNDS
DATA LOGGING UNIT
BPILLAR GROUND
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Fig 3: Instrument Cluster Circuit (1 of 2) HOT IN IGNITION ON
INSTRUMENT CLUSTER 10A
PANEL LIGHTS DATA OPTIONAL IND 5 OPTIONAL IND 4 TRAILER ABS IND OPTIONAL IND 2 OPTIONAL IND 1 WASHER LEVEL
INSTRUMENT CLUSTER 10A
AE2
ISO BUS
RIGHT HEADLIGHT 15A
AD1
AD2
AE1 NCA
AA3
POWER DISTRIBUTION MODULE
DOME LIGHT 15A
AC5
NB3
NCA
320A
NCA
29A
NCA
1587C
29A
NCA
F
437D
NCA
C
B5
NCA
437D
437C
NCA
B6
NCA
437C
437F
NCA
E
B7
NCA
437F
437B
NCA
A
B8
NCA
437B
437E
NCA
D
B9
NCA
437E
437G
NCA
H
B10
NCA
1587+C
GND
NCA
G
NCA
437Z
NCA
NCA
NCA
108
376F
108
NCA
20
442B
20A
29A
NCA
359
NCA
A2
NCA
A1
437A
442B 437
NCA
NCA
DATA LOGGING 6 UNIT CONNECTOR
HOT AT ALL TIMES
NCA
HOT AT ALL TIMES
INTERIOR LIGHTS SYSTEM
A3 A4 A5 A6 A7
ANTILOCK BRAKES SYSTEM
437
NCA
320A
NCA
1
A8 A9
2
A10 A11 A12
KEYPAD PANEL LIGHTS J1587 DATABUS () WIRE 3 WIRE 2 WIRE 5 WIRE 1 WIRE 4 J1587 DATABUS (+) BUZZER ENABLE
B1 B2 B3 B4
B11 B12
COMPUTER DATA LINES SYSTEM
COMPUTER DATA LINES SYSTEM
B
KEYPAD
LEFT 1 NCA C1 C2
IGNITION KEY SW LT DOOR OPEN PARKING BRAKE PYROMETER (+) AMBIENT AIR (+) LEFT TURN COOLANT LEVEL RECIRC PRESSURE
C3
NCA
108K
C4
NCA
437W
C5
NCA
125
C6
NCA
218A+
C7
NCA
299
C8
NCA
38L
C9
NCA
173
C10
NCA
98K
NCA
N16
NCA
C799
NCA
D419
NCA
N25
NCA
C659
NCA
D509
NCA
N01
NCA
GND2
D6
NCA
218A
D7
NCA
299A
D11
NCA
437G
D12
NCA
GND
D13
NCA
GND1
D14
NCA
437
D15
NCA
437A
D16
NCA
359
125
INTERIOR LIGHTS SYSTEM
NCA PARK BRAKE SWITCH
ENGINE CONTROLS SYSTEM EXTERIOR LIGHTS SYSTEM
437Z
NCA
173
NCA
437A
NCA
3 4
C11 C12 C13
C14 ENGINE PROTECTION (CUMMINS ONLY) C15 CHECK ENGINE C16 ENGINE SHUTDOWN
5
ENGINE CONTROLS SYSTEM
D1 D2 D3 D4 D5 PYROMETER () AMBIENT AIR ()
ENGINE CONTROLS SYSTEM
299
NCA
299A
NCA
GND1
NCA
D8
6 7
D9 D10 KEYPAD PANEL GND KEYPAD LIGHT GND GROUND JUMPER BATTERY IGNITION HEADLIGHTS
8
LEFT 2
RECIRCULATION AIR SWITCH
HEADLIGHT SWITCH
LEFT DOOR SWITCH
108
NCA
108D
NCA
108
NCA
108D
NCA
20
NCA
20A
NCA
NCA
98K
NCA
INSTRUMENTATION CONTROL UNIT
RIGHT DOOR SWITCH
205873
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Fig 4: Instrument Cluster Circuit (2 of 2)
A1 A2 ANTILOCK BRAKES SYSTEM
COMPUTER DATA LINES SYSTEM 1 2
NCA NCA
INTERIOR LIGHTS SYSTEM
437
STARTING/CHARGING SYSTEM
320A
376L
NCA
A3
1587+C
NCA
A4
1587C
NCA
A5
29A
NCA
A6
437Z
NCA
A7
15D
NCA
A8 A9
OPTIONAL IND 7 OPTIONAL IND 6 TRACTOR ABS J1587+C J1587C PANEL LIGHTS BUZZER ENABLE STARTER LOCKOUT
A10 437
NCA
38R
NCA
A11
20H
NCA
B2
18
NCA
B3
376S
NCA
B4
47
NCA
B5
47G
NCA
B6
A12 EXTERIOR LIGHTS SYSTEM NCA
HEADLIGHTS SYSTEM
18
ANTILOCK BRAKES SYSTEM NCA
18A
B1
B7 PRIMARY LOW AIR PRESSURE SWITCH
BATTERY RIGHT TURN HEADLIGHTS LOW AIR PRESSURE WHEEL SPIN FUEL LEVEL (+) FUEL LEVEL ()
B8 B9 B10 NCA
437
18A
NCA
B11 B12
BATTERY
RIGHT 1 NCA SECONDARY LOW AIR PRESSURE SWITCH
C1 C2 C3 43G
NCA
C4
42G
NCA
C5 C6
3 4
NCA
437Z
NCA
173
C7 C8 C9 C10 C11 C12 C13 C14
5
NCA
437A SUPPLEMENTAL RESTRAINTS SYSTEM
437A
NCA
C15
GND1
NCA
C16
454L
NCA
D1 D2 D3
43
NCA
D4
42
NCA
D5
30G
NCA
D6
30
NCA
D7 D8 D9
6 7
NCA
299
D10
NCA
299A
D11 D12 D13 D14 D15
OPTIONAL IND 8 OPTIONAL GAUGE REARMOSTAXLE OIL TEMP SENS () FORWARDAXLE OIL TEMP SENS () GAUGE RETURN (AU07) GAUGE RETURN (AU08) GAUGE RETURN (AU09) GAUGE GROUND (AU06) GAUGE POWER (AU06) GAUGE POWER (AU07) GAUGE POWER (AU08) GAUGE POWER (AU09) IGNITION CHASSIS GROUND AIR BAG OPTIONAL BUZZER C POWER OPTIONAL GAUGE TYPE 2D (+) REARMOSTAXLE OIL TEMP SENS (+) FORWARDREARAXLE OIL TEMP SENS (+) TRANS FLUID TEMP GAUGE () TRANS FLUID TEMP GAUGE (+) OPTIONAL GAUGE TYPE 2E () OPTIONAL GAUGE TYPE 2E (+) OPTIONAL GAUGE TYPE 2F () OPTIONAL GAUGE TYPE 2F (+) OPTIONAL GAUGE TYPE 2G () OPTIONAL GAUGE TYPE 2G (+) OPTIONAL BUZZER D
D16 8
NCA
RIGHT 2
GND1
INSTRUMENTATION CONTROL UNIT
42
NCA
43
NCA
42G
NCA
43G
NCA
47G
NCA
47
299
NCA
299A
NCA
NCA
H8
H4
H6
H2
G9
B9
D7
D9
30
NCA
30G
BULKHEAD CONNECTOR
J2
320A
NCA
NCA F1
J3
F4
173
NCA
NCA
CHASSIS CONNECTOR
205874
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Fig 5: Instrument Cluster Circuit, Level I,ICU3
HOT AT ALL TIMES
NCA
PANEL LIGHTS LOW AIR PRESSURE IND TRANSMISSION TEMP IND AIR FILTER RESTRICTION IND OPTIONAL IND 2 OPTIONAL IND 3 OPTIONAL IND 4 (OPTIONAL)
NO CHARGE IND
A1
NCA
29A
A3
NCA
18
A4
NCA
30G
A5
NCA
183A
A2
A6
437
INTERIOR LIGHTS SYSTEM 18
ENGINE AIR INDUCTION SYSTEM
NCA
NCA
A7
PRIMARY LOW AIR PRESSURE INDICATOR SWITCH
A8 A9
NCA
137
NCA
20H
NCA
1587C
A10
STARTING/CHARGING SYSTEM
A11 HIGH BEAM IND OPTIONAL IND 5 J1587 DATALINK ()
A12 B1
NCA
HEADLIGHTS SYSTEM
B2 B3 B4
NCA
COMPUTER DATA LINES SYSTEM
SECONDARY LOW AIR PRESSURE INDICATOR SWITCH
B5 B6 B7 OPTIONAL IND 6 J1708/J1587 (+) TRACTOR ABS IND OPT BUZZER INPUT
OPTIONAL IND 8
B8
30G
NCA
B9 B10
NCA
1587+C
B11
NCA
376L
B12
NCA
437Z
NCA
125
C1
COMPUTER DATA LINES SYSTEM
NCA
ANTILOCK BRAKES SYSTEM ANTITHEFT SYSTEM
TRANSMISSION TEMPERATURE INDICATOR SWITCH
C1 C2 C3 C4
PARK BRAKE IND
C5
125
NCA
C6 C7
LEFT TURN SIGNAL RECIRC AIR IND OPTIONAL IND 7 TRANS OIL TEMP SENSOR () TRANS OIL TEMP SENSOR (+) OPTIONAL IND 1 (STOP ENGINE LIGHT; CUMMINS)
C8
NCA
38L
C10
NCA
98K
C11
NCA
376S
C12
NCA
30G
C13
NCA
30
NCA
C799
NCA
D419
NCA
N25
NCA
C659
NCA
D509
C9
C15
C16 ENGINE PROTECTION IND (SHUTDOWN WARNING; OPTIONAL)
FUEL LEVEL () PANEL LIGHT GND () OPTIONAL IND 9 J1939 (+)
PARK BRAKE SWITCH
AIR CONDITIONING SYSTEM ANTILOCK BRAKES SYSTEM
C14
CHECK ENGINE IND
FUEL LEVEL (+)
NCA
EXTERIOR LIGHTS SYSTEM
NCA
N01
D1
NCA
47
D2
NCA
47G
D3
NCA
GND1
NCA
1939+C
D8
NCA
38R
D9
NCA
1939C
D10
NCA
GNDC
D11
NCA
1939
D12
NCA
376F
D13
NCA
GND1
D14
NCA
437
D15
NCA
437A
D16
NCA
359
ENGINE CONTROLS SYSTEM
D4 D5 D6
COMPUTER DATA LINES SYSTEM
D7
C2
POWER DISTRIBUTION SYSTEM
30G
IGN PWR (+)
ANTILOCK BRAKES SYSTEM
NCA
BAT PWR (+) HEADLIGHT PWR (+)
ANTILOCK BRAKES SYSTEM
30
PC BOARD GND ()
NCA
TRAILER ABS (OPTIONAL)
COMPUTER DATA LINES SYSTEM
47
J1939 (SHIELD)
EXTERIOR LIGHTS SYSTEM
NCA
EMI GND ()
47G
J1939 ()
NCA
RIGHT TURN SIGNAL
HEADLIGHTS SYSTEM
INSTRUMENT CLUSTER
FUEL LEVEL SENDER
TRANSMISSION OIL TEMPERATURE SENSOR
205875
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Fig 6: Instrument Cluster Circuit, Level II,ICU2L
HOT AT ALL TIMES NCA
NCA
NCA
437
SECONDARY LOW AIR PRESSURE SWITCH NCA PANEL LIGHTS LOW AIR PRESSURE IND OPTIONAL IND 3 OPTIONAL IND 2 OPTIONAL IND 1 LOW OIL PRESSURE IND COOLANT TEMPERATURE IND OIL TEMPERATURE SENSOR (+) OIL TEMPERATURE SENSOR () HIGH BEAM IND OIL TEMPERATURE SENSOR (+) J1587 DATABUS () OIL TEMPERATURE SENSOR ()
A1
NCA
29A
NCA
18
A2 A3
INTERIOR LIGHTS SYSTEM 18
NCA
A4
PRIMARY LOW AIR PRESSURE SWITCH
A5 A6 A7
NCA
GND
A8
NCA
GND
A10
NCA
42
A11
NCA
42G
A12
NCA
20H
B2
NCA
43
B3
NCA
1587C
B4
NCA
43G
B10
NCA
1587+C
B11
NCA
376L
A9
B1
ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM
HEADLIGHTS SYSTEM
42
NCA
+
42G
NCA
FORWARD REAR AXLE OIL TEMPERATURE SENSOR
COMPUTER DATA LINES SYSTEM
B5 B6 B7 B8 B9
J1587 DATABUS (+) TRACTOR ABS IND
B12
43
NCA
+
43G
NCA
COMPUTER DATA LINES SYSTEM ANTILOCK BRAKES SYSTEM
C1
RECIRCULATION PRESSURE IND
C1
NCA
98K
C5
NCA
125
C6
NCA
218A+
NCA
38L
C11
NCA
376S
C12
NCA
30G
C13
NCA
30
C14
NCA
N16
C15
NCA
C799
NCA
D419
NCA
N25
NCA
C659
NCA
D509
C2
REARMOST AXLE OIL TEMPERATURE SENSOR
AIR CONDITIONING SYSTEM
C3 C4
PYROMETER (+) LEFT TURN IND
C7 C8 C9
125
NCA
ENGINE CONTROLS SYSTEM NCA
EXTERIOR LIGHTS SYSTEM
PARK BRAKE SWITCH
C10
CHECK ENGINE IND C16 ENGINE PROTECTION IND (SHUTDOWN WARNING; OPTIONAL)
TRAILER ABS IND GROUND BATTERY IGNITION HEADLAMPS
D5 D6
NCA
218A
D8
NCA
38R
D9
NCA
437Z
D10
NCA
GND
D12
NCA
376F
D13
NCA
GND
D14
NCA
437
D15
NCA
437A
D16
NCA
359
D7 EXTERIOR LIGHTS SYSTEM
C2
NCA
30
ANTITHEFT SYSTEM
D11 ANTILOCK BRAKES SYSTEM
EMI GND
GND
D4
NCA
RIGHT TURN IND OPT BUZZER INPUT
NCA
+
PYROMETER GROUND
47G
D3
47
OPTIONAL IND 4
47
NCA
NCA
PANEL LIGHT GROUND
N01
NCA
D2
47G
FUEL LEVEL ()
NCA D1
+
FUEL LEVEL (+)
ENGINE CONTROLS SYSTEM
NCA
OPTIONAL IND 1 (STOP ENGINE LIGHT; CUMMINS)
ANTILOCK BRAKES SYSTEM
WHEEL SPIN IND TRANS FLUID TEMP GAUGE () TRANS FLUID TEMP GAUGE (+)
30G
PARKING BRAKE IND
POWER DISTRIBUTION SYSTEM HEADLIGHTS SYSTEM
INSTRUMENT CLUSTER
FUEL SENDER
TRANSMISSION FLUID TEMPERATURE SENSOR
205876
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Fig 7: Instrument Cluster Circuit, Level III,ICU2M
HOT AT ALL TIMES
NCA PANEL LIGHTS EVENT KEY LOW AIR PRESSURE IND (OPTIONAL)
AUTO TRANS WARN
(OPTIONAL)
ALTER NO CHRG WARN
(OPTIONAL) (OPTIONAL)
TRAIL ABS IND ECAS FAIL WARN
(OPTIONAL)
ECAS TRANSFER IND WASHER LEVEL WARNING
OIL TEMPERATURE SENSOR (+) OIL TEMPERATURE SENSOR () HIGH BEAM IND OPTIONAL IND 6 OIL TEMPERATURE SENSOR (+) J1587 DATABUS () OIL TEMPERATURE SENSOR () WIRE 3 (KEYPAD) WIRE 2 (KEYPAD) WIRE 5 (KEYPAD) WIRE 1 (KEYPAD) WIRE 4 (KEYPAD) J1587 DATABUS (+) TRACTOR ABS IND
A1
NCA
29A
A3
NCA
18
A4
NCA
31
A5
NCA
137
A6
NCA
376F
A7
NCA
434B
A8
NCA
434P
A9
NCA
320A
A10
NCA
42
A11
NCA
42G
A12
NCA
20H
B2
NCA
43
B3
NCA
1587C
B4
NCA
43G
B10
NCA
1587+C
B11
NCA
376L
A2
B1
437
INTERIOR LIGHTS SYSTEM 18
NCA
TRANSMISSIONS SYSTEM LOW AIR PRESSURE SWITCH
STARTING/CHARGING SYSTEM ANTILOCK BRAKES SYSTEM TRANSMISSIONS SYSTEM TRANSMISSIONS SYSTEM WIPER/WASHER
HEADLIGHTS SYSTEM
42
NCA
+
42G
NCA
FORWARD REAR AXLE OIL TEMPERATURE SENSOR
COMPUTER DATA LINES SYSTEM
B5 B6 B7 B8 B9
43
B12
NCA +
COMPUTER DATA LINES SYSTEM ANTILOCK BRAKES SYSTEM 43G
NCA
C1
(OPTIONAL)
LOW VOLTAGE WARN
C1
NCA
19B
C5
NCA
125
C6
NCA
218A+
NCA
38L
C11
NCA
376S
C12
NCA
30G
C13
NCA
30
C14
NCA
N16
C15
NCA
C799
NCA
D419
NCA
N25
NCA
C659
NCA
D509
C2
REARMOST AXLE OIL TEMPERATURE SENSOR
STARTING/CHARGING SYSTEM
C3
CHECK ENGINE IND C16 ENGINE PROTECTION IND (SHUTDOWN WARNING)
RIGHT TURN IND OPT BUZZER INPUT EMI GND KEYPAD PANEL GND TRAILER ABS IND GROUND BATTERY IGNITION HEADLAMPS INSTRUMENT CLUSTER
NCA
GND
D6
NCA
218A
D7
NCA
299A
D8
NCA
38R
D9
NCA
444K
D10
NCA
GND
D12
NCA
376F
D13
NCA
GND
D14
NCA
437
D15
NCA
437A
D16
NCA
359
D4 D5 ENGINE CONTROLS SYSTEM AIR CONDITIONING SYSTEM EXTERIOR LIGHTS SYSTEM WARNING SYSTEM
D11
C2
ANTILOCK BRAKES SYSTEM 30G
AMBIENT AIR ()
47G
D3
NCA
OPTIONAL DEVICE PYROMETER GND
47
NCA
30
OPTIONAL IND 8
N01
NCA
D2
ENGINE CONTROLS SYSTEM
POWER DISTRIBUTION SYSTEM HEADLIGHTS SYSTEM
FUEL SENDER
PANEL LIGHT GND
NCA D1
ANTILOCK BRAKES SYSTEM
NCA
FUEL LEVEL ()
PARK BRAKE SWITCH
+
FUEL LEVEL (+)
NCA
EXTERIOR LIGHTS SYSTEM
47
STOP ENG IND (CUMMINS ONLY)
NCA
C10
NCA
WHEEL SPIN IND TRANS FLUID TEMP GAUGE () TRANS FLUID TEMP GAUGE (+)
C9
47G
HVAC INPUT
C8
+
LEFT TURN IND OPTIONAL DEVICE
125 ENGINE CONTROLS SYSTEM
NCA
AMBIENT AIR SNS (+)
C7
PYROMETER (+)
C4
GND
PARKING BRAKE IND
NCA
DOOR OPEN IND
TRANSMISSION FLUID TEMPERATURE SENSOR
205877
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INTERIOR LIGHTS Fig 1: Dome Light Circuit HOT AT ALL TIMES POWER DISTRIBUTION SYSTEM
SLEEPER PD10S CIRCUIT BREAKER 60A
NCA
41S
B
NCA
GND
NCA
D
NCA
41A+
41A
2
NCA
41A+ NCA
NCA
CURTAIN BOW LIGHT REAR SWITCH 2
NCA
41A+
3
NCA
41A
3
NCA
41A
2
NCA
41A+
2
NCA
41A
3
NCA
41A+
NCA
NCA
41R
41S
NCA 14S
NCA
NCA 14S
14S
NCA 14S
2A
NCA
A
NCA
NCA
B
NCA
41B+
NCA
C
NCA
41B
NCA
D
NCA
NCA
GND
PWR GND CNTRL CNTRL
41A
CURTAIN BOW FLUORESCENT 3
2C
GND
41A
NCA
1C
REAR WALL DOME LIGHT
41A+
C
1A
GND
NCA
NCA
5A
41S NCA
NCA
CTRL
A
NCA
MA0
CLOSED 15A
41B+
NCA
2
41B
NCA
3 UPPER BACK WALL DOME LIGHT SWITCH
41A+
CTRL
NCA
41A
GND
NCA
PWR
CLOSED 15A
41B
NCA
3
41B+
NCA
2 LOWER BACK WALL DOME LIGHT SWITCH
LOWER MAIN DOME LIGHT SWITCH
GND
NCA
NCA
113
NCA
113
NCA
113
NCA
113
B
NCA
113
A
NCA
113A
D
GND
NCA
B
41R
NCA
41RB
NCA
2
3 UPPER READING LIGHT SWITCH
DOME LIGHT SWITCH
C
A
41R
NCA
B
NCA
REAR WALL FLUORESCENT
UPPER MAIN DOME LIGHT SWITCH
A
41S
GND
NCA
41RB
NCA
B
NCA
GND
NCA
A
NCA UPPER READING LIGHT
BAGGAGE AREA LIGHT SWITCH
41R
NCA
41RA
NCA
3
2 LOWER READING LIGHT SWITCH
BUNK LIGHT SWITCH
205970
LEFT BAGGAGE DOOR SWITCH
BUNK LIGHT SPLICE PACK
RIGHT BAGGAGE LIGHT
NCA
113A NCA
113
GND
113
A NCA
B
NCA
D
B NCA
A
NCA
C
B NCA
113A B
NCA
A
A NCA
113A NCA
113A NCA
113A NCA
113A
113A
NCA
NCA
113A
A RIGHT BAGGAGE DOOR SWITCH
41RA
NCA
113
113
NCA
NCA
B
GND NCA
GND
NCA
A
NCA
NCA
B
NCA CONTROL PANEL READING LIGHT
LEFT BAGGAGE LIGHT
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Fig 2: Overhead Console Lamps Circuit HOT AT ALL TIMES
HOT AT ALL TIMES
CLUSTER CIRCUIT BREAKER 16 10A
NCA
172
A NCA
172
NCA
GND
B NCA
GND
NCA
29A
C NCA
29A
D
NCA
POWER DISTRIBUTION MODULE
CIRCUIT BREAKER 43 15A
AA4
NB4
AC6
AC5
NB3
NCA 172
NCA 41
NCA 105
NCA 108
NCA 108
108
NCA
A
108D
NCA
B
(NOT USED)
RIGHT CAB DOOR SWITCH
OVERHEAD CLOCK
PWM DIMMER SWITCH CONNECTOR
NCA
29A
108
NCA
A
108D
NCA
B LEFT CAB DOOR SWITCH
108D
A NCA
108D
DIFFUSE DOME
NCA
NCA
41
B NCA
41
NCA
GND
C NCA
GND
NCA
437W
C4
DOOR SWITCH SENSE CLUSTER
RED
WHITE SPOT
NCA
108D
NCA
GND
NCA
GND3 NCA GND
RIGHT MAP/DOME LIGHT
GND3
NCA
B
GND
NCA
108A
NCA
A
PWR
NCA
D TO PDM MAIN F7, GND BUS
RIGHT FLOOR WELL LIGHT
GROUND SPLICE PACK
A
B
GND1
NCA
A
PWR
NCA
108A
NCA
B
GND
NCA LEFT FLOOR WELL LIGHT
NCA
GND
C NCA
GND
NCA
41
B NCA
41
DIFFUSE DOME
WHITE SPOT
RED
NCA GND1
NCA
108D
A NCA
108D
(NOT USED)
9
(NOT USED)
7
108A
NCA
3
108A
NCA
108
NCA
2
GND2
NCA
8
29A
NCA
10
LEFT MAP/DOME LIGHT
GROUND STUD
GND2
NCA
EXTERIOR LIGHTS SYSTEM
FOOTWELL LIGHT SWITCH
205971
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NAVIGATION Fig 1: Navigation Circuit
J1
NCA
P1
NCA
W31
P1
NCA
W31
P7
NCA
W30
J4
NCA
W24
J2
NCA
W32
J3
NCA
AUXILIARY POWER DISTRIBUTION MODULE
CELLULAR ANTENNA
TRANSCEIVER NCA W30
P3 P4 W24
P1
NCA
MICROPHONE
CIRCUIT BOARD
GPS ANTENNA
NCA
CH2
J1
NCA
J2
NCA
NCA W22 W23
NCA W32
NCA W25
P1
J1
NCA
NCA
NCA
CH1 J1
NORITAKE DISPLAY DISPLAY UNIT
GPS RECEIVER CONTROL UNIT 206239
MOTOROLA HANDSET
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POWER DISTRIBUTION
1 W/O ISO RELAY
16
NCA
Fig 1: Power Distribution Circuit (1 of 4) DEPOPULATION STUD
16
NCA
NCA
(OR 52E)
16
NCA
6
NCA
15B
16C
NCA
16
NCA
30
NCA
14
NCA
14
NCA
14
NCA
14
NCA
6
87
NCA BATTERY 4 DEEP CYCLE CAB BATTERY
W/O ISO RELAY
BATTERY 3
POWER DISTRIBUTION MODULE
SLEEPER (EBOX) MAXI FUSE 60A
MA
BA
NB4
JE
AB1
UTILITY LT CB 15A
NB3
AC8
AC7
DOME CB 15A
AC6
EF
EE
OPT SW 2 CB 15A
AC5
OPT SW 1 CB 15A
TO ACC RELAY (DIAGRAM 1 OF 4)
A
B
NCA
AE1
HVAC MINI RELAY
CIGAR CB 15A
14C
14B
NCA
NCA
LD
HVAC HIGH SPEED MINI RELAY
RIGHT HEADLIGHT CB (CYCLING) 15A
AF3
LEFT HEADLIGHT CB (CYCLING) 15A
3
TO STOPLIGHT CB, 25A (DIAGRAM 2 OF 4)
14
NCA
DD
HVAC MAXI CB 30A 5
52E
14A
JG
NCA NCA
B
57
TO IGN RELAY (DIAGRAM 1 OF 4)
D
(OR 16C)
ALTERNATOR
AD4
BATTERY 2
14
BATT+
W/ ISO RELAY
16C W/ ISO RELAY
STARTER
MAGNETIC SWITCH
BATTERY 1
7V ISO RELAY
D
C
1
BATT+
BATT PWR
NCA
NCA
NCA
NCA
NCA
15B
NCA
1 E
CIGAR LIGHTER ELEMENT
GROUND DISTRIBUTION SYSTEM
TO IGNITION CB (DIAGRAM 2 OF 4) A
86
85
LOCK
NCA
GND
NCA
GND+
NCA
52A ACC RELAY
30
85
87
14C
NCA
52B
NCA
14A
NCA
52D
NCA
D 52D
NCA
86
87
G
15K (OR 15)
IGNITION RELAY
30
TO WIPER CB, 15A (DIAGRAM 2 OF 4)
OFF
C
W/O ISO RELAY 52B
NCA
RUN
JUMPER
B
A
FROM RIGHT HEADLIGHT CB, 15A, CYCLING (DIAGRAM 1 OF 4)
FROM OPT SW 2 CB, 15A (DIAGRAM 1 OF 4)
TO ENG ECM CB, 10A (DIAGRAM 1 OF 4)
15A
15K 15A
NCA
NCA NCA
B
NCA
ACC
START
W/ ISO RELAY
F
B
OFF
NCA
RUN
15
A NCA
ACC LOCK
START
OFF
52D
RUN
C
ACC LOCK
START
52C
NCA
NCA GND 52
IGNITION SWITCH
GND+
NCA
NCA
C715
STARTING/CHARGING SYSTEM
C
A
NCA
F
NCA
MAGNETIC SWITCH
IGN POWER OPT CB 15A
INST CLUSTER CB 10A
ENG FAN CB 10A
BACKUP LIGHT CB 10A
A/C CLUTCH CB 10A
AIR DRYER CB 15A
IGN POWER OPT CB 30A
FB
DA
ND6
AF5
NF5
AE5
BF
BE
BD
AB3
AC1 NCA
W/ ISO RELAY
AB4
STARTER LOCKOUT MICRO RELAY AF1
NC1
JD
DE
FUEL HTR MINI RELAY
OPT GA IGN PWR CB 10A
POWER DISTRIBUTION MODULE
1
AE2
2
ENG ECM CB 10A
52D
START SIG
52C
A9 DATA LOGGING UNIT (DLU)
FROM
G IGNITION SWITCH, PIN C (DIAGRAM 1 OF 4)
206277
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Fig 2: Power Distribution Circuit (2 of 4) FROM ACC RELAY (DIAGRAM 1 OF 4)
52A
WINDSHIELD FAN CB 10A
SPOTLIGHT CB 10A
POWER DISTRIBUTION MODULE
JC
JA
LF
GB
RIGHT HEADLIGHT MICRO RELAY DB
LEFT HEADLIGHT MICRO RELAY
ACC POWER OPT CB 30A
2
JH
EC
AD5
2
HVAC MINI RELAY
HIGH WIPER MICRO RELAY AB2
LOW WIPER MICRO RELAY
2
3
CB RADIO CB 10A
JF
2
RADIO CB 10A
ED
2
ACC POWER CB 15A
DF
MIRROR CB 15A
JB
WIPER CB 15A
CD
NCA
C
POWER DISTRIBUTION MODULE
FROM RIGHT HEADLIGHT CB (CYCLING), 15A (DIAGRAM 1 OF 4)
D E TRAILER ABS CB 30A
LC
POWER SEAT CB 30A
DC
KB
GA
FA
TRAILER AUX MAXI CB 30A
KC
BAT PWR OPT DOOR LOCK CB
BC
RIGHT WINDOW CB 15A
LA
LEFT WINDOW CB 15A
CE
LE
AA5
DRL CB 10A
CC
HORN CB 15A
ND8
STOPLIGHT CB 25A
TO CLUSTER CB, 10A (DIAGRAM 2 OF 4)
POWER DISTRIBUTION MODULE
FROM TRAILER ABS CB, 30A (DIAGRAM 2 OF 4)
E
CLUSTER CB 10A
EBOX MAXI FUSE 40A
IGNITION CB 10A 3
TRAILER TAILLIGHTS MAXI CB 30A
TRAILER MARKER MINI RELAY
FUEL HTR MAXI CB 30A 3
FUEL HEATER MINI RELAY
ROAD LIGHT CB 20A
FLASHER CB 20A 5
3
ROAD LAMP RELAY
TRACTOR TAILLIGHTS CB 15A
FLASHER RELAY
TRACTOR TAIL/MRKR MICRO RELAY
PANEL LAMP CB 15A 5
PANEL LAMP MICRO RELAY
52
AA6 NCA
MB
BB
AA4
AA3
AA7
TRAILER TAILLIGHT MINI RELAY
3
TRAILER MARKER MAXI CB 30A
F FROM IGNITION SWITCH, PIN A (DIAGRAM 1 OF 4)
206278
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Fig 3: Power Distribution Circuit (3 of 4) CAB OVER ENGINE C
NCA
52R
A
NCA
14E
14S
14S
A3 NCA
14S
A4 NCA
14S
A7 NCA
14S
14S
14S
A6 NCA
14S
G6 NCA
14S
G7 NCA
52R
G5 NCA
52R
52R
G3 NCA
G4 NCA
14E
A2 NCA
14E
A1 NCA
14E
G1 NCA
14E
G2 NCA
NCA
A8 NCA
NCA
52R
NCA
14E
NCA
CONNECTOR P6
AUXILIARY POWER MODULE
41R
NCA
57B
NCA
B7 41S
READ/ BAG FUSE 15A
B3
LEFT RCPT FUSE 15A
B4
SLPR DOME FUSE 15A
NCA
B8 NCA
B6 NCA
+12V
H6 NCA
RIGHT RCPT FUSE 15A
HVAC CIRCUIT BREAKER 30A
57A
COM BATT FUSE 15A
OPT+
H7 57C
G8
NCA
ACC+
52K
NCA
PNL RCPT FUSE 15A
H8
OPT ACC FUSE 10A
NCA
442A
NCA
376C
NCA
H4 434R
DLU IGN FUSE 10A
H5
ABS IGN FUSE 10A
H3
COM IGN FUSE 10A
NCA
331
NCA
NCA
DIAGNOSTIC/ OPS FUSE 10A
B2
ABS BATT 1 FUSE 15A
376A
H1 NCA
376B
H2 442
NCA
ABS BATT FUSE 15A
B1
DLU BATT FUSE 10A
AIR CONDITIONING SYSTEM A
NCA
434R
B
NCA
376C
C
NCA
442
D
NCA
376B
E
NCA
98Y
F
NCA
376A
G
NCA
331
H
NCA
97A
CONNECTOR P1
A
NCA
52K
B
NCA
57C
C
NCA
OPT+
D
NCA
442A
E
NCA
GND
F
NCA
G
NCA
98Z
H
NCA
ACC+
AIR CONDITIONING SYSTEM
AIR CONDITIONING SYSTEM
GND AIR CONDITIONING SYSTEM
NCA
98S
B
NCA
98H
C
NCA
57C
D
NCA
52K
E
NCA
ACC+
F
NCA
ACC+
G
NCA
98H
H
NCA
98L
NCA
14S
NCA
57A
C
NCA
41S
D
NCA
GND
E
NCA
GND
F
NCA
98R
G
NCA
57B
H
NCA
41R
GND
NCA NCA
B
AIR CONDITIONING SYSTEM
AIR CONDITIONING SYSTEM
CONNECTOR P3
A
98H
ACC+
A
NCA
CONNECTOR P2
NCA
GND
AIR CONDITIONING SYSTEM AIR CONDITIONING SYSTEM
CONNECTOR P4
C
NCA
GND
A
NCA
14S
NCA
14S
CONNECTOR P5
206279
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Fig 4: Power Distribution Circuit (4 of 4) CONVENTIONAL
C
NCA 14S
B
NCA GNDS
A
NCA GNDF
CONNECTOR CH2
98L
B NCA
98R
A NCA
98S
AIR CONDITIONING SYSTEM AIR CONDITIONING SYSTEM
CONNECTOR SH1
C
NCA 14E
B
NCA GNDE
52R
NCA
A
52K
NCA
B
97A
NCA
C
98Y
NCA
E
98Z
NCA
F
D
AIR CONDITIONING SYSTEM
CONNECTOR CH3 NCA
14S
POWER RCPT 1 CB 15A
AUXILIARY POWER MODULE
NCA
57B
8A
4A
POWER RCPT 2 CB 15A
NCA
41R
NCA 5A
14S
7A
NCA
14S
2C
READ/ BAG LAMP CB 15A
NCA
41S
NCA
8B 57C
NCA
14S
1C
NCA 1A
MAIN DOME LAMP CB 15A
2A
POWER RCPT 3 CB 15A
NCA
8A 98P
NCA
OPT+
2A
14S
9B
14S
NCA 7A
14S
3A
NCA
52K
14S
SLEEPER HVAC CB 30A
OPT BATT PWR CB 15A
NCA
NCA
8D
OPT IGN ACC CB 10A
ACC+
331
NCA
2A 376A
NCA 9D
14E
NCA 7A
DIAGNOSTIC/ ECAS BATT CB 10A
8A
ABS BATT 1 CB 15A
NCA
376B
NCA
442
14E
NCA 1A
14E
5A ABS BATT 2 CB 15A
4A
6D
DLU BATT CB (OPT) 10A
NCA
434R
NCA
14E
NCA
52R
5D
NCA 7C NCA
376C
NCA
4C 442A
ECAS IGN CB (OPT) 10A
8C
ABS IGN PWR CB 10A
2C
DLU IGN CB (OPT) 10A
NCA
52R
NCA
52R
1C
5C
NCA
NCA
NCA
NCA 14E
CONNECTOR CH1
52R
NCA
A
14S
GNDF
C NCA
57A
D NCA
AIR CONDITIONING SYSTEM A
NCA
442A
B
NCA
442
C
NCA
GNDE
CONNECTOR DLU F
NCA
GNDE
E
NCA
GNDE
D
NCA
GNDE
C
NCA
376C
B
NCA
376B
A
NCA
376A
CONNECTOR DC1
C
NCA
GNDE
B
NCA
331
A
NCA
434R
CONNECTOR DC2
A
NCA
GNDE
B
NCA
331
NCA
331
CONNECTOR CH4
A
NCA
ACC+
B
NCA
OPT+
C
NCA
GND
CONNECTOR DC3
H
NCA
GND
NCA
GND
G
NCA
GND
NCA
GND
F
NCA
GND
NCA
GND
E
NCA
41S
D
NCA
41R
C
NCA
57C
B
NCA
57B
A
NCA
57A
AIR CONDITIONING SYSTEM
CONNECTOR SH2
206280
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POWER DOOR LOCKS Fig 1: Power Door Locks Circuit HOT AT ALL TIMES MAIN POWER DISTRIBUTION MODULE
BAT PWR OPT DOOR LOCK CB 10A
FA
9
GA 9
7
NCA 443
NCA 443 7
5B
NCA
443U1
6
NCA
GND
TO MIRROR
443U2
NCA
5B
443U1
NCA
6
4 4 3
NCA
443
1
NCA
GND
2B
NCA
443L1
8
NCA
GND
10
NCA
29A
NCA
3
443L1
NCA
1
443L2
NCA
2B
MIRRORS SYSTEM
GND
NCA
8
INTERIOR LIGHTS SYSTEM
29A
NCA
10
MIRRORS SYSTEM INTERIOR LIGHTS SYSTEM
LEFT DOOR LOCK SWITCH
A
B
NCA
443U
A NCA
443U
443L 443L
RIGHT DOOR LOCK SWITCH
NCA
NCA B NCA NCA
443U
A NCA NCA
443L
B NCA
KEYLESS ENTRY CONNECTOR
NCA 205872
443 TO MIRROR
M
M
LEFT DOOR LOCK ACTUATOR
RIGHT DOOR LOCK ACTUATOR
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POWER SEATS Fig 1: Power Seats Circuit
HOT AT ALL TIMES
HOT IN ON OR START
CIRCUIT BREAKER 24 21A
HOT AT ALL TIMES
CIRCUIT BREAKER 51 21A
HOT IN ON OR START
CIRCUIT BREAKER 46 21A
CIRCUIT BREAKER 51 21A
GND BUS
A
NCA
GND BUS
LC0
DA0
AF7
DC0
FB0
HB0
NCA 242B
NCA 242C
NCA GND
NCA 242
NCA 242A
NCA GNDP
242B 242A
C
NCA
MAIN POWER DISTRIBUTION MODULE
NCA
C
242
NCA
A
GND
NCA
B
242C A
B
PASSENGER SEAT
NCA
GND
B
C SPLICE PACK CONNECTOR P1
DRIVER'S SEAT
205996
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POWER WINDOWS Fig 1: Driver Power Window Circuit
HOT AT ALL TIMES MAIN POWER DISTRIBUTION MODULE
LEFT WINDOW CIRCUIT BREAKER 25 15A CC NCA 363
10
NCA
29A
2B
NCA
363A
NCA
363A
1
NCA
GND
3
NCA
363
NCA
363
363
NCA
A
NCA
363E
NCA
B
NCA
INTERIOR LIGHTS SYSTEM
4
M LEFT WINDOW REGULATOR MOTOR 363
NCA
A
363B
NCA
B
6
NCA
GND
363A
NCA
C
5B
NCA
363B
363E
NCA
D
LEFT WINDOW SWITCH
IGN DOWN UP MOTOR WINDOW EXPRESS MODULE
205868
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Fig 2: Driver/Passenger Power Window Circuit
HOT AT ALL TIMES MAIN POWER DISTRIBUTION MODULE
RIGHT WINDOW CIRCUIT BREAKER 18 15A
LA
NCA
363D1
6
NCA
GND
NCA
A
NCA
363D
NCA
B
NCA
M RIGHT WINDOW REGULATOR MOTOR
CE
NCA 363R 5B
363D
NCA 363R 363D
NCA
5B
363D1
NCA
6
4
4
3
NCA
363R
363R
NCA
3
1
NCA
GND
363D1
NCA
1
2B
NCA
363D1
363D
NCA
2B
8
NCA
GND
GND
NCA
8
10
NCA
29A
29A
NCA
10
INTERIOR LIGHTS SYSTEM
LEFT WINDOW SWITCH
RIGHT WINDOW SWITCH
205867
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RADIO Fig 1: Radio Circuit, Delco
NCA NCA
RIGHT FRONT TWEETER A 95F+
NCA
B
NCA
95F
NCA
C
NCA
95F+
NCA
E
95F
NCA
F
95AL+
NCA
E
95AR+
NCA
C
95AR
NCA
D
95AL
NCA
B
D
B
RIGHT FRONT MIDRANGE
A
NCA
NCA
NCA
NCA
95F+ 95F
NCA
F
NCA
C STEREO CONNECTOR
LEFT FRONT MIDRANGE
NCA NCA
LEFT FRONT TWEETER
A1 A2 A3
NCA
95WL+
A4
NCA
95WR+
NCA
GRD
GRD
NCA
NCA
295E
295E
NCA
B3
NCA
95WL
B4
NCA
95WR
A5 A6 A7 A8 A9 A10 A11 A12 B1
PDM
B2 95AR
NCA
95AR+
NCA
B5 B6 B7 LEFT REAR MIDRANGE
B8 B9
NCA
95WR+
B10
NCA
95WR
B11
NCA
95WR+
B12
NCA
95WL
SUB AMPLIFIER NCA
95WL
95AL+
NCA
NCA
95WR+
95AL
NCA RIGHT REAR MIDRANGE
RIGHT SUB WOOFER NCA
95WR
NCA
95WR+
LEFT SUB WOOFER
281876
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STARTING/CHARGING Fig 1: Charging Circuit, W/ Conventional Batteries
C
NCA
16
D
NCA
14
E
NCA
16
POWER DISTRIBUTION SYSTEM
DEPOPULATION STUD
STARTING CIRCUIT
16
GNDA NCA
NCA
15B NCA
NCA 1
GNDA
16
NCA
6
NCA
GND
GND STRAP
6
NCA
BATT+
NCA
NCA 1
BATTERY 1
NCA
BATTERY 2
NCA 1
BATTERY 3
NCA 1
NCA 6
NCA 6
NCA 6
NCA 6
STARTER GND
ALTERNATOR
206263
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Fig 2: Charging Circuit, W/ Isolated Batteries
NCA
16C
87
NCA
16
NCA
30
86
NCA
428R
85
NCA
GND
52E/16C
NCA
16C
NCA
16
NCA
16
NCA
14
POWER DISTRIBUTION SYSTEM
DEPOPULATION STUD
7V ISO RELAY
15B
NCA
STARTING CIRCUIT
16 NCA 6 NCA
BATT+
6
NCA
6 NCA
GNDA NCA
GND
16
GNDA
NCA
NCA
NCA 428R NCA
GND STRAP
6
NCA
BATTERY 4 DEEP CYCLE CAB BATTERY
NCA 1
NCA 1 NCA
BATTERY 3
NCA 1
NCA 1
BATTERY 2
NCA 1
BATTERY 1
6
NCA
6
NCA
6
NCA
STARTER
1 ALTERNATOR
GND
206265
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Fig 3: Starting Circuit, W/ Conventional Batteries HOT AT ALL TIMES POWER DISTRIBUTION MODULE
C715
NCA
A NCA
A
EVENT RECORDER (CATERPILLAR)
52
AA6
IGNITION CIRCUIT BREAKER 10A
IGNITION SWITCH ACC
START
15
OFF
15A
NCA
A9
A
NCA B
RUN
15 (OR 15K)
DATA LOGGING UNIT (DLU)
GND
NCA
CHARGING CIRCUIT
GND
15A
NCA
START
15B
NCA
BATT
15C
NCA
CRANK
6
BATTERY 2
MAGNETIC SWITCH BATTERY 1
1
15B NCA
NCA GNDA
16 NCA
15C
6 NCA
NCA
6 NCA
GND ALTERNATOR
BATT+
STRTR
GND
STARTER NCA
NCA
NCA
NCA 1
NCA 1
NCA 1
GNDA
GND
GND STRAP
NCA 6
NCA 6 BATTERY 3
NCA
NCA 6
NCA
GND
15K
NCA
B
NCA
JUMPER
M 206262
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Fig 4: Starting Circuit, W/ Isolated Batteries HOT AT ALL TIMES IGNITION CIRCUIT BREAKER 10A
POWER DISTRIBUTION MODULE
NCA
EVENT RECORDER (CATERPILLAR)
C715
52
C1 A NCA
A IGNITION SWITCH ACC
START RUN
OFF
NCA
A
15
15A
DATA LOGGING UNIT (DLU)
NCA
GND
15A
NCA
START
15B
NCA
BATT
15C
NCA
CRANK
STRTR
GNDA
15B NCA
1
GND
GND ALTERNATOR
NCA
16
15C
6
NCA
BATT+
NCA
6
NCA
NCA
GND
STARTER NCA GND STRAP
NCA 1
BATTERY 4 DEEP CYCLE CAB BATTERY
NCA
NCA 6 BATTERY 3
NCA 1
MAGNETIC SWITCH
NCA 6
NCA 6 BATTERY 2
NCA 1
NCA
CHARGING CIRCUIT
NCA 6
NCA 6 NCA 1 NCA 1
GND
15K
NCA
GND
CHARGING CIRCUIT
NCA
A9
JUMPER
B
BATTERY 1
NCA
15 (OR 15K)
NCA
B
M
206264
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SUPPLEMENTAL RESTRAINTS Fig 1: Dual Air Bags Circuit HOT AT ALL TIMES POWER DISTRIBUTION MODULE
1
SUPPLEMENTAL RESTRAINTS (SPACE SYSTEM) AIR BAG FUSE
SPACE FUSE 5A A1
NOTE: CIRCUIT BREAKER POSITION 17 IS DESIGNATED "IGNITION POWERED OPTIONS"
EMI SHIELD GND
SPACE CIRCUIT BREAKER 17 15A
B1
NCA
454G
454
NCA
81C
NCA
81C
NCA
E
454G
NCA
2
2
3
DRIVER SRS PASS SPACE+ PASS SPACE SRS WARN LP
NCA
4
454
5
NCA
454A+
6
NCA
454A
5
7
NCA
454D+
454D+
NCA
7
8
NCA
454D
454D
NCA
8
9
NCA
454L (OR 454)
10
NCA
6
9
NCA
1587+B
14
NCA
1587B
15
NCA
454
454
NCA
15
16
NCA
GND
GND
NCA
16
13
2B 2A
B A
NCA NCA
1587B
3
1
GRY
VIO
454G
NCA
DRIVER SIDE SPACE MODULE
NCA
14
GND
GROUND
12
13
NCA
IGNITION +12V
PASS SPACE
11
12
SAE D/L 1587
PASS SPACE+
10
11
SAE D/L 1587+
EM1 SHIELD GND
3
4 DRIVER SRS+
1
IGNITION+12V GROUND PASSENGER SIDE SPACE MODULE
NCA
GROUND STUD
1587+B
CLOCKSPRING
JUNCTION BLOCK DIAGNOSTIC CONNECTOR GRY AIR BAG IND
D1
NCA
454L (OR 454)
CLUSTER
205969
NCA
VIO
2
1 AIR BAG CONNECTOR
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Fig 2: Single Air Bag Circuit HOT AT ALL TIMES
1
NCA
454 454
81C
NCA
B1
81C
E NCA
SUPPLEMENTAL RESTRAINTS (SPACE SYSTEM) AIR BAG FUSE
SPACE FUSE 5A A1
NOTE: CIRCUIT BREAKER POSITION 17 IS DESIGNATED "IGNITION POWERED OPTIONS"
EMI SHIELD GND
SPACE CIRCUIT BREAKER 17 15A
NCA
POWER DISTRIBUTION MODULE
NCA
454G
5
NCA
454A+
6
NCA
454A
9
NCA
454L (OR 454)
10
NCA
2 3 4
DRIVER SRS+ DRIVER SRS PASS SPACE+ PASS SPACE SRS WARN LP
7 8
11
GROUND
1587+B
NCA
1587B
15
NCA
454
16
NCA
GND
NCA
DRIVER SIDE SPACE MODULE
454G
IGNITION +12V
NCA
14
NCA
SAE D/L 1587
13
NCA
SAE D/L 1587+
GND
12
NCA
NCA
3
1
GRY
VIO
NCA CLOCKSPRING
2A
B A
NCA NCA
1587+B
GROUND STUD
GRY
AIR BAG IND
D1
NCA
JUNCTION BLOCK DIAGNOSTIC CONNECTOR
1587B
454L (OR 454)
2B
NCA 2
VIO 1 AIR BAG CONNECTOR
CLUSTER 205967
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TRANSMISSION Fig 1: Transmission Circuit, Meritor EOA Range Shift
NCA
NCA
NCA
NEUTRAL SWITCH
B
NCA
A
NCA
B
LOW SOLENOID
NCA NCA
A
B
HIGH SOLENOID
NCA
A
NCA
NCA
B
NCA
A
NCA NCA J2
F
E NCA
B BLU
YEL
A
D
B GRN
C
A WHT
BLK
SET SWITCH
SHIFT KNOB
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NCA
D NCA
C NCA
B NCA
B
A BLU
RESUME SWITCH
HI NCA
LO
CONNECTS TO VEHICLE WIRING
YEL
B GRN
NCA
D
A
BLK
ORG
C WHT NCA
NCA 281875
HI
A NCA
CONNECTS TO VEHICLE WIRING
CONNECTS TO VEHICLE WIRING
LO
B NCA
B NCA
A NCA
A NCA
SOLENOID ASSEMBLY REVERSE SWITCH (OPTIONAL)
PAUSE SWITCH
SHIFT KNOB (OPTIONAL)
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Fig 2: Transmission Circuit, Meritor Smart Shift HOT AT ALL TIMES
HOT IN ON OR START PDF
M2 223A
464A
NCA
464C
NCA
223A
464B
NCA
NCA
NCA
C
232
B A
NCA
B
FUSE 2
SMART SHIFT 1 2 COMPUTER DATA LINES SYSTEM 1
NCA
1939+T
3
NCA
1939T
4
NCA
1587T
5
NCA
1587+T
6
NCA
223R1
7
NCA
464A
8
NCA
464C
9
NCA
223R2
11
NCA
464B
12
NCA
223T1
13
NCA
223P2
14
NCA
223P1
15
NCA
223T2
17
NCA
223P3
18
NCA
223P
2
COMPUTER DATA LINES SYSTEM
1587T
NCA
3
1587+T
NCA
4
GND+
NCA
5
223A
NCA
6 TRANSMISSION DISPLAY
COMPUTER DATA LINES SYSTEM
10
GND+
NCA
GND
NCA GND SPLICE PACK
16
T1
A2
1 2
GND
NCA
A1
223M
NCA
C2
GND
NCA
GND
NCA
223M+
NCA
3 4
NCA
223M
5 6 7
NCA
223L
8
NCA
223H
9
NCA
223S4
10
NCA
223S1
11
NCA
223S2
12
NCA
223S3
13
NCA
232
14
NCA
223A
15
NCA
GNDE
NCA
GNDE
A
NCA
223S3
B
NCA
223S4
C
NCA
223S1
D
NCA
223S2
E
NCA
223L
F
NCA
223H
NCA
GNDE
A
NCA
223T1
B
NCA
223T2
C
NCA
223P3
D
NCA
223P2
E
NCA
223P1
G
NCA
223R1
H
NCA
223R2
NCA
223P
B2
C1 INDICATOR LIGHT RELAY
T2 TRANSMISSION ECU
BATT GND
223M+
NCA
C1
CHECK TRANSMISSION INDICATOR DASH CLUSTER
G H M8
F
J K M10 TRANSMISSION HARNESS VENDOR SUPPLIED
281873
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For additional transmission wiring diagrams, see TRANSMISSION WIRING DIAGRAMS article.
WARNING SYSTEMS Fig 1: Collision Warning Circuit, Eaton Vorad EVT200 HOT AT ALL TIMES
HOT IN ON OR START
CIRCUIT BREAKER 13 18A
HOT AT ALL TIMES
CIRCUIT BREAKER 11 17.5A
CIRCUIT BREAKER 18
MAIN POWER DISTRIBUTION MODULE
FLASHER RELAY
AB3 NCA
ANTENNA 1 ANTENNA 2 ANTENNA 3 ANTENNA 4 ANTENNA 5 ANTENNA 6 ANTENNA 7 ANTENNA 8 SIGR TBSD ISP GND + 12V GND SIGRTBSSENS +12V RSTEERSMSR GND LSTEERSMSR +12 COUANALOG +12V COUDATA COUCLK GND SPEAKER RTTURSIG BRAKE IGNITION 1587+ 1587 GND
AF2 444
NCA
AA5 38A
NCA
1
NCA
NCA
2
NCA
NCA
3
NCA
NCA
4
NCA
NCA
5
NCA
NCA
6
NCA
NCA
7
NCA
8
NCA
C12
NCA
444L
C13
NCA
444M
C11
NCA
444K
D13
NCA
444U
D12
NCA
444T
D11
NCA
444A
D8
NCA
444I
D7
NCA
444G
C8
NCA
444G
C7
NCA
444F
C5
NCA
444D
C6
NCA
444E
C4
NCA
444C
D4
NCA
444N
D5
NCA
444P
D6
NCA
444R
C2
NCA
38R
444U
NCA
A
GND
NCA
C1
NCA
36B
444T
NCA
B
SIGRTBSSENS
NCA
D1
NCA
444
444A
NCA
C
+12V
NCA
D9
NCA
J1587+W
D10
NCA
J1587W
NCA
GND
NCA NCA FRONT ANTENNA ECU
444L
NCA A
444M
NCA B
444K
NCA C D
SIGR TBSD ISP GND +12V NOT USED SIDE SENSOR DISPLAY UNIT
SIDE SENSOR UNIT
38R
NCA
12
38A
NCA
39L
NCA
38L
1
3
NCA
6
36A
NCA
7
28D
NCA
2
HEADLIGHTS SYSTEM
GND1
GND1
NCA 11
NCA
TURN SIGNAL SWITCH
EXTERIOR LIGHTS SYSTEM
NCA
38L
39L
28D NCA
39R
NCA
38R
NCA
NCA
NCA
36B NCA B STOP LIGHT SWITCH
NCA
NCA STEERING SENSOR UNIT
9
36B NCA A
444I A NCA +12V
444G B NCA LSTEERSNSR
444G C NCA GND
444F D NCA RSTEERSNSR
COUANALOG
444E
444D A NCA
DRIVER DISPLAY UNIT
+12V
444C C NCA
B NCA
444N D NCA COUCLK
COUANALOG
444P GND
444R NCA F
E NCA
EXTERIOR LIGHTS SYSTEM
SPEAKER
1587+A 10B NCA 1788 +A
1587+A 3B NCA 1788 A LEFT SIDE CLUSTER
NCA
NCA ANTILOCK BRAKES SYSTEM
2A
2B
36B
DATA LINK JUNCTION BLOCK (LEFT B PILLAR)
39R
36B
NCA J1587W 3A
NCA
NCA 3B
J1587+W
EATON VORAD EVT200 ELECTRONIC CONTROL UNIT
HEADLIGHTS SYSTEM
205964
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Fig 2: Collision Warning Circuit, Eaton Vorad EVT300 HOT IN ON OR START
MAIN POWER DISTRIBUTION MODULE
CIRCUIT BREAKER 13 10A BDG
NCA 444
POWER GND VBUS+ VBUS IGNITION POWER GND
C3
NCA
444J1
444J1
NCA
4
C9
NCA
444J2
444J2
NCA
3
C5
NCA
444J+
444J+
NCA
2
C6
NCA
444J
444J
NCA
1
C1
NCA
444
C2
NCA
GND1
C15 SIGNAL GND SIGNAL POWER 1587+ 1587 POWER GND VBUSPOS VBUSNEG BRAKE GND FRAME GND
NCA
POWER DCRIN VBUSPOS VBUSNEG FRONT ANTENNA
38R
NCA
444L
C14
NCA
444A
C13
NCA
444U
C12
NCA
444T
C7
NCA
C8
NCA
D3
NCA
444E
D4
NCA
444P
D5
NCA
D6
NCA
C9
NCA
36B
NCA
GND
38R
TO EXTERIOR LIGHTS (RF TURN SIGNAL)
NCA
J1587+W J1587+W
444R 444N
EATON VORAD EVT300 CPU
444L
NCA
4
444M
NCA
3
444K
NCA
2 1
SIGNAL GND POWER NOT USED SIDE DISPLAY
444A
NCA
A
GND
NCA
444U
NCA
B
SIGNAL
NCA
444T
NCA
C
+12V
NCA
444E
1587+W
1587+W
NCA
NCA
444P
NCA D
444R
NCA C
444N
NCA
NCA
B
NCA
NCA
36B
SIDE SENSOR
POWER
GND
DRIVER DISPLAY
B
A 1587+ 5A
STOP LIGHT
1587 5B
OPTION CONNECTOR
VBUSPOS
A VBUSNEG
A
36B
VORAD DATA BUS JUNCTION BLOCK
205966
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Fig 3: Low Voltage Disconnect Circuit
HOT AT ALL TIMES
VIN WARNING BUZZER CTRL VOUT
447B
NCA
GND
NCA
14B
NCA
447J
NCA
14BS
NCA
14BS
GND
NCA
GND
NCA
NCA GROUND
NCA
447B
VSENSE FUSE 15A
VSENSE
MAIN POWER DISTRIBUTION MODULE
LOW VOLTAGE DISCONNECT GROUND FUSE 15A
POWER DISTRIBUTION SYSTEM
POWER DISTRIBUTION SYSTEM
447J
NCA
14BS
NCA
14BS
NCA
LOW VOLTAGE DISCONNECT MODULE
WARNING BUZZER
205965
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WIPER/WASHER Fig 1: Intermittent Wiper/Washer Circuit
315
NCA
CIRCUIT BREAKER 15A
INTERMITTENT WIPER & WINDSHIELD WIPER SWITCHES NCA NCA
7
NCA
3
NCA
NCA 315
NCA
318
5
NCA
316
9
NCA
29A
10
NCA
GND
NCA
87
317
NCA
87A
NCA
1
315
30
315
NCA
INTERIOR LIGHTS SYSTEM
85
NCA
315A
86 INTERMITTENT WIPER RELAY ("A" PANEL)
315 NCA
318
317 NCA
NCA
NCA
316
WIPER SWITCH (ON LEFT SIDE DASH PANEL)
WIPER MOTOR
315
NCA
A
BLU
GND
NCA
B
BLK
315A
NCA
C
YEL
320
NCA
D
RED INTERMITTENT WIPER/WASHER SLIDER SWITCH (ON DASH PENAL BELOW WIPER SWITCH)
M
NCA
GND
NCA
NCA
320
281871
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M WASHER MOTOR
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Fig 2: Wiper/Washer Circuit HOT IN ON OR ACC POWER DISTRIBUTION MODULE
NCA
315A
1
NCA
315
5
NCA
320
2
NCA
29A
6
NCA
AE6 AE8
AD5 AD5 NCA
85
NCA 315B
NCA
NCA
86
INTERIOR LIGHTS SYSTEM
NCA
LHA9
INSTRUMENTATION CONTROL UNIT
NCA 320A NCA
WASHER LEVEL SENSOR
GND
B 12V
A
NCA
315C
NCA
315H
NCA
315P
E
C
HIGH
LOW
D
NCA
M
WASHER PUMP
NCA
NCA
WIPER SWITCH
205946
NE6 NE8
BLUE
GND
4
315L
ILL
315B
NB5 NB5
87
320
W
NCA
NCA
L 12V
3
87A
30
AD6 AD8
NCA 315L H
85
NCA
NB6 NB6
SPRAGUE TRICO
86
315H
87
315P
87A
315A
30
HIGH SPEED RELAY
315
LOW SPEED RELAY
WIPER CIRCUIT BREAKER 15A
WIPER MOTOR
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