GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Engine Controls Connector End Views
Table 1: Accelerator Pedal
Table 2: Automatic Transmission (A/T) Modulator
Table 3: Automatic Engine Shutdown Engine Coolant Temperature Switch
Table 4: Automatic Transmission (A/T) Modulator Shift Relay (Flasher/Relay Center)
Table 5: Air ABS Relay (Flasher/Relay Center)
Table 6: Clutch Pedal Position (CPP) Switch
Table 7: Cruise Control Switch
Table 8: Cruise Control Clutch Switch
Table 9: Data Link Connector (DLC)
Table 10: Engine Coolant Temperature Switch
Table 11: Engine Coolant Temperature (ECT) Gauge Sensor
Table 12: Engine Oil Pressure (EOP) Gauge Sensor
Table 13: Engine Oil Pressure (EOP) Indicator Switch
Table 14: Ether Injector-Engine Coolant Temperature (ECT) Switch
Table 15: Exhaust Brake Switch
Table 16: Exhaust Brake Air interlock Relay (JE5)
Table 17: Exhaust Brake Solenoid Valve
Table 18: Fuel Sender
Table 19: Fuel Heater
Table 20: Hi Idle Switch
Table 21: Low Engine Coolant Level Indicator Switch
Table 22: Multifunction Alarm Module (MFAM) C1
Table 23: Multifunction Alarm Module (MFAM) C2 (KPJ)
Table 24: Powertrain Control Module (PCM) (LG5)
Table 25: Speedo Adapter
Table 26: Stoplamps Switch C1
Table 27: Stoplamps Switch C2
Table 28: Brake Switch Interface Module
Table 29: Vehicle Speed Sensor (VSS) (Manual)
Table 30: Vehicle Speed Sensor (VSS) (Auto)

Accelerator Pedal


Object Number: 68730 Size: CH

Connector Part Information
    • 12110293
    • 3 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN/BLK

431

Reference voltage Feed -8 Volt Reference

B

BLK

808

Sensor Return

C

DK BLU

417

Throttle Position Sensor Signal

Automatic Transmission (A/T) Modulator


Object Number: 68721 Size: CH

Connector Part Information
    • 15300027
    • 2 Way F Metri-Pack 280 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN

323

Shift Solenoid Feed

B

BLK

150

Ground

Automatic Engine Shutdown Engine Coolant Temperature Switch


Object Number: 35437 Size: CH

Connector Part Information
    • 12052644
    • 2 Way F Metri-Pack 150 Series, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

ORN/BLK

535

Coolant Temperature Switch Output

B

--

--

Not Used

Automatic Transmission (A/T) Modulator Shift Relay (Flasher/Relay Center)


Object Number: 73243 Size: CH

Connector Part Information
    • 12160504
    • 36 Way (BLK)

Pin

Wire Color

Circuit No.

Function

A1-A9

--

--

Not Used

B1

PPL

6

Start Solenoid Feed

B2

--

--

Not Used

B3

ORN/BLK

434

Transmission Mounted Neutral Safety Switch Signal (Diesel)

B3

PPL

806

Fuse Output -Crank- Type III Fuse (LP4/L21)

B4

--

--

Not Used

B5

BRN

323

Shift Solenoid Feed

B6

--

--

Not Used

B7

BLK

150

Ground

B7

PNK

339

Fuse Output -Ignition- Type III Fuse (Diesel)

B8-B9

--

--

Not Used

C1

BLK

150

Ground (Diesel)

C1

YEL

447

Starter Relay Output -Coil (LP4/L21)

C2

--

--

Not Used

C3

RED

542

Fuse Output -Battery- Type II Fuse

C4

--

--

Not Used

C5

GRY

324

Shift Relay Output -Coil

C6

--

--

Not Used

C7

PNK

639

Fuse Output -Ignition 1- Type III Fuse (LG5)

C7

PNK

339

Fuse Output -Ignition 1- Type III Fuse (LXO)

C8-D9

--

--

Not Used

Air ABS Relay (Flasher/Relay Center)


Object Number: 73243 Size: CH

Connector Part Information
    • 12160504
    • 36 Way (BLK)

Pin

Wire Color

Circuit No.

Function

A1-A9

--

--

Not Used

B1-B4

--

--

Not Used

B5

BRN

1941

Fuse Output Ignition Type III Fuse

B6

--

--

Not Used

B7

BRN

341

Fuse Output Ignition Type III Fuse

B8-B9

--

--

Not Used

C1-C4

--

--

Not Used

C5

BLK

150

Ground

C6

--

--

Not Used

C7

LT GRN

147

Fuse Output -Off/Run- Type III Fuse

C8-C9

--

--

Not Used

D1-D9

--

--

Not Used

Clutch Pedal Position (CPP) Switch


Object Number: 280768 Size: CH

Connector Part Information
    • 12052832
    • 2 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN/WHT

379

Cruise Control Clutch Pedal Switch Output

B

BLK

808

Sensor Return

Cruise Control Switch


Object Number: 223368 Size: CH

Connector Part Information
    • 12020651
    • 4 Way F Edgeboard Series ECM (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

808

Sensor Return

B

GRY

397

Cruise Control On Switch Output

C

GRY/BLK

87

Cruise Control Resume/ Accel Switch Signal

D

DK BLU

84

Cruise Control Set Coast Switch Signal

Cruise Control Clutch Switch


Object Number: 309396 Size: CH

Connector Part Information
    • 12064870
    • 2 Way M (BLU)

Pin

Wire Color

Circuit No.

Function

A

BRN/WHT

379

Cruise Control Clutch Pedal Switch Output

B

BLK

808

Sensor Return

Data Link Connector (DLC)


Object Number: 68793 Size: CH

Connector Part Information
    • 12110250
    • 16 Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

1-3

--

--

Not Used

4

BLK

150

Ground

5

BLK/WHT

451

Powertrain Control Module (PCM) Ground

6

WHT/BLK

448

Diagnostic Enable Serial Power Train

7

TAN/BLK

1921

Serial Data Link-A-SAE 1708

8-11

--

--

Not Used

12

TAN/WHT

799

Diagnostic Signal ABS

13-14

--

--

Not Used

15

WHT/BLK

1922

Serial Data Link-B-SAE 1708

16

ORN

140

Fuse Output Battery Type III Fuse

Engine Coolant Temperature Switch


Object Number: 236598 Size: CH

Connector Part Information
    • 12052641
    • 2 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN

1675

Check Gauges Signal

B

--

--

Not Used

Engine Coolant Temperature (ECT) Gauge Sensor


Object Number: 68719 Size: CH

Connector Part Information
    • 12162198
    • 2 Way F Metri-Pack 150 Series, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

DK GRN

135

Coolant Temperature Sensor Signal

B

BLK

150

Ground

Engine Oil Pressure (EOP) Gauge Sensor


Object Number: 236406 Size: CH

Connector Part Information
    • 12065400
    • 2 Way F Metri-Pack 150 Series, Sealed (LT GRN)

Pin

Wire Color

Circuit No.

Function

A

TAN/WHT

331

Oil Pressure Sensor Signal

B

BLK

150

Ground

Engine Oil Pressure (EOP) Indicator Switch


Object Number: 236480 Size: CH

Connector Part Information
    • 12065299
    • 1 Way F Metri-Pack 150 Series, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

TAN/BLK

231

Oil Pressure Switch Signal

Ether Injector-Engine Coolant Temperature (ECT) Switch


Object Number: 258174 Size: CH

Connector Part Information
    • 12010973
    • 2 Way M Weather Pack (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN

37

Engine Metal Temperature Sensor Signal

B

BLK

150

Ground

Exhaust Brake Switch


Object Number: 62432 Size: CH

Connector Part Information
    • 12041492
    • 5 Way F Metri-Pack 280 Series. (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

1962

Engine Brake Solenoid Feed

B

BLK

150

Ground

C

--

--

Not Used

D

WHT

1961

Engine Brake Switch Output

E

BLK/WHT

1962

Engine Brake Solenoid Feed

Exhaust Brake Air interlock Relay (JE5)


Object Number: 39685 Size: CH

Connector Part Information
    • 12110539
    • 5 Way F Metri-Pack 280 Series, Flexlock, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

30

PPL

1146

Engine Brake Enable Signal

85

PPL

1146

Engine Brake Enable Signal

86

PNK

1905

Retarder Disable Output

87

--

--

Not Used

87A

BLK/WHT

1962

Engine Brake Solenoid Feed

Exhaust Brake Solenoid Valve


Object Number: 68721 Size: CH

Connector Part Information
    • 15300027
    • 2 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

1962

Engine Brake Solenoid Feed

B

BLK

150

Ground

Fuel Sender


Object Number: 38608 Size: CH

Connector Part Information
    • 12162188
    • 4 Way F Metri-Pack 150.2 Series, Sealed, (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

150

Ground

B-C

--

--

Not Used

D

PPL

30

Fuel Gauge Sensor Signal

Fuel Heater


Object Number: 68721 Size: CH

Connector Part Information
    • 15300027
    • 2 Way F Metri-Pack 280 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN

641

Fuse Output Ignition 3 Type III Fuse

B

BLK

150

Ground

Hi Idle Switch


Object Number: 95782 Size: CH

Connector Part Information
    • 12052833
    • 2 Way M Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

808

Sensor Return

B

DK GRN

534

High Idle Switch Output

Low Engine Coolant Level Indicator Switch


Object Number: 236598 Size: CH

Connector Part Information
    • 12052641
    • 2 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN

1478

Low Coolant Sensor Signal

B

BLK

150

Ground

Multifunction Alarm Module (MFAM) C1


Object Number: 73152 Size: CH

Connector Part Information
    • 12084944
    • 16 Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A1

LT BLU/BLK

1928

Brake Booster Fluid Flow Switch Feed

A2

YEL

53

Fuse Output-Generator-Tachometer Pulse

A3

LT BLU

20

Stop Lamp Feed

A4

ORN/BLK

434

Transmission Mounted Neutral Safety Switch Signal

A5

PNK

39

Fuse Output-Ignition

A6

TAN/WHT

33

Brake Warning Indicator Lamp Output

A7

TAN/BLK

231

Oil Pressure Switch Signal

A8

BLK

150

Ground

B1

LT GRN

1478

Low Coolant Sensor Signal

B2

YEL/BLK

68

Low Coolant Level Indicator Lamp Output

B3

YEL/BLK

1471

Brake Warning Indicator Lamp Feed-Seconday

B4

GRY

847

Brake Pedal Switch Output-Extended Travel

B5

TAN/WHT

33

Brake Warning Indicator Lamp Output

B6

BRN

1675

Check Gauges Signal

B7

LT BLU

1377

Check Gauges Indicator Lamp Output

B8

ORN

1740

Fuse Output-Battery

Multifunction Alarm Module (MFAM) C2 (KPJ)


Object Number: 280782 Size: CH

Connector Part Information
    • 12064760
    • 4 Way F Metri-Pack 150, Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

850

Ground

B

BLK

150

Ground

C

--

--

Not Used

D

GRY

535

Coolant Temperature Switch Output

Powertrain Control Module (PCM) (LG5)


Object Number: 328564 Size: CH

Connector Part Information
    • 12186584
    • 70 Way F Connector Assembly, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

1-3

--

--

Not Used

4

LT GRN/BLK

431

Reference Voltage Feed-8 Volt Reference

5

BLK

808

Sensor Return

6-7

--

--

Not Used

8

TAN/BLK

1921

Serial Data Link-A-SAE-1708

9

WHT/BLK

1922

Serial Data Link-B-SAE-1708

10-11

--

--

Not Used

12

WHT

1961

Engine Brake Switch Output

13-19

--

--

Not Used

20

GRY

324

Shift Relay Output-Coil

21

--

--

Not Used

22

BRN/WHT

379

Cruise Control Clutch Pedal Switch Output

23-27

--

--

Not Used

28

BRN/WHT

419

Check Engine Indicator Lamp Output

29-30

--

--

Not Used

31

RED

2013

High Idle Indicator Lamp Output

32

YEL

400

Vehicle Speed Sensor Signal

33-34

--

--

Not Used

35

DK BLU

84

Cruise Control Set/Coast Switch Signal

36-39

--

--

Not Used

40

DK GRN

534

High Idle Switch Output

41-43

--

--

Not Used

44

GRY/BLK

87

Cruise Control Resume/Accel Switch Signal

45

TAN

848

Brake Pedal Switch Signal-ABS

46

WHT/BLK

448

Diagnostic Enable Signal-Powertrain

47-51

--

--

Not Used

52

ORN

840

Fuse Output-Battery

53

ORN

840

Fuse Output-Battery

54-58

--

--

Not Used

59

GRY

397

Cruise Control On Switch Output

60-61

--

--

Not Used

62

ORN/BLK

1786

Transmission Park/Neutral Signal

63

--

--

Not Used

64

LT BLU

20

Stop Lamp Feed

65

BLK/WHT

451

Engine Control Module Ground

66

DK BLU

417

Throttle Position Sensor Signal

67

BLK/WHT

451

Engine Control Module Ground

68-69

--

--

Not Used

70

PNK

139

Fuse Output-Ignition

Speedo Adapter


Object Number: 73152 Size: CH

Connector Part Information
    • 12084945
    • 16 Way F Micro-Pack 100 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A1

GRY/BLK

1467

Two Speed Rear Axle Shift Motor Relay Output-Coil

A2-A8

--

--

Not Used

B1

PNK

39

Fuse Output-Ignition

B2

PPL/WHT

821

Vehicle Speed Sensor Signal

B3

LT GRN/BLK

822

Vehicle Speed Sensor Return

B4

--

--

Not Used

B5

BLK/WHT

451

Powertrain Control Module (PCM) Ground

B6

--

--

Not Used

B7

YEL

400

Vehicle Speed Sensor Signal

B8

DK GRN

389

Vehicle Speed Signal-4000 Pulses Per Mile

Stoplamps Switch C1


Object Number: 130679 Size: CH

Connector Part Information
    • 12033704
    • 4 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

ORN

640

Fuse Output Battery Type III Fuse

B

LT BLU

20

Stop Lamp Feed

C

ORN

540

Fuse Output Battery Type III Fuse

D

GRY

847

Brake Pedal Switch Output Extended Travel

Stoplamps Switch C2


Object Number: 333038 Size: CH

Connector Part Information
    • 12033709
    • 2 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

808

Sensor Return

B

TAN

848

Brake Pedal Switch Signal ABS

Brake Switch Interface Module


Object Number: 62420 Size: CH

Connector Part Information
    • 12004706
    • 6 Way F Printed Circuit Edgeboard Series Standard (BLK)

Pin

Wire Color

Circuit No.

Function

A

PNK

39

Fuse Output-Ignition

B

PNK

139

Fuse Output-Ignition

C

BLK

850

Ground

D-F

--

--

Not Used

Vehicle Speed Sensor (VSS) (Manual)


Object Number: 232831 Size: CH

Connector Part Information
    • 12162194
    • 2 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PPL/WHT

821

Vehicle Speed Sensor Signal

B

LT GRN

822

Vehicle Speed Sensor Return

Vehicle Speed Sensor (VSS) (Auto)


Object Number: 35437 Size: CH

Connector Part Information
    • 12052644
    • 2 Way F Metri-Pack 150 Series, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

PPL/WHT

821

Vehicle Speed Sensor Signal

B

LT GRN

822

Vehicle Speed Sensor Return