GM Service Manual Online
For 1990-2009 cars only
Table 1: Cigar Lighter (Front/Rear)
Table 2: Underhood Junction Block C1
Table 3: Underhood Junction Block C2
Table 4: Underhood Junction Block C3
Table 5: Underhood Junction Block C4
Table 6: Underhood Junction Block C5
Table 7: Rear Junction Block C1
Table 8: Rear Junction Block C2
Table 9: Rear Junction Block C3
Table 10: Rear Junction Block C4

Cigar Lighter (Front/Rear)


Object Number: 38228  Size: CH

Connector Part Information

    • 12047699
    • 2 Way (GRY)

Pin

Wire Color

Circuit No.

Function

A

ORN

2040

Fuse Output - Battery

B

BLK

350

Ground

Underhood Junction Block C1


Object Number: 73172  Size: CH

Connector Part Information

    • 15303512
    • 68 Way F Metri-Pack 280 Series(GRY)

Pin

Wire Color

Circuit No.

Function

A1

ORN

57

Cornering Lamp Feed

A2-A3

--

--

Not Used

A4

BRN/WHT

309

Park Lamp Feed

A5

LT BLU

14

Turn Signal Lamp Feed

A6

--

--

Not Used

A7

GRY

532

Coolant Fan Motor Feed - Secondary

A8

BLK

58

Cornering Lamp Feed

A9

PNK

1200

Headlamp Lamp Output - High Beam

A10-A11

--

--

Not Used

A12

DK GRN

29

Horn Feed (F Note)

B1-B3

--

--

Not Used

B4

PPL

709

Park Lamp Feed

B5

DK BLU

15

Turn Signal Lamp Feed

B6

--

--

Not Used

B7

BLK

250

Ground

B8-B11

--

--

Not Used

B12

DK GRN

29

Horn Feed (A Note)

C1-C4

--

--

Not Used

C5

TAN/WHT

312

RH Low Beam Headlamp Feed

C6

GRY

691

RH Low Beam Headlamp Relay Output - N.O. Contact (Export)

C7-C9

--

--

Not Used

C10

PPL

34

Fog Lamp Feed

C11

PPL

34

Fog Lamp Feed

C12

--

--

Not Used

D1-D9

--

--

Not Used

D10

WHT

504

Coolant Fan Motor Output

D11-D12

--

--

Not Used

E1-E4

--

--

Not Used

E5

YEL

712

LH Low Beam Headlamp Feed

E6-E9

--

--

Not Used

E10

LT BLU

409

Coolant Fan Motor Feed

E11-E12

--

--

Not Used

F1-F5

--

--

Not Used

F6

LT GRN/BLK

311

RH High Beam Headlamp Feed

F7

DK GRN/WHT

711

LH High Beam Headlamp Feed

F8-F10

--

--

Not Used

F11

BLK

250

Ground

F12

--

--

Not Used

Underhood Junction Block C2


Object Number: 73168  Size: CH

Connector Part Information

    • 15303514
    • 68 Way F Metri-Pack 280 Series (BRN)

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

YEL/BLK

625

Vehicle Anti-Theft System Starter Enable Relay Control

A3-A12

--

--

Not Used

B1-B3

--

--

Not Used

B4

PPL

709

Park Lamp Feed-Left

B5

BRN/WHT

309

Park Lamp Feed-Right

B6

ORN

240

Battery Positive Voltage (B+)

B7-B9

--

--

Not Used

B10

LT GRN/BLK

592

Daytime Running Lamp Relay Control

B11

--

--

Not Used

B12

ORN

2040

Battery Positive Voltage (B+)

C1

ORN

57

Cornering Lamp Feed-Left

C2

BLK/WHT

1969

High Beam Headlamp Relay Control

C3

YEL

43

Ignition Positive Voltage

C4

YEL

43

Ignition Positive Voltage

C5

--

--

Not Used

C8

PNK

639

Ignition Positive Voltage

C9-C10

--

--

Not Used

C11

DK GRN/WHT

1317

Fog Lamp Relay Output - Coil

C12

--

--

Not Used

D1

DK GRN

1483

Headlamp Control Power Output

D2

BRN

4

Ignition Switch Output Accessory

D3

--

--

Not Used

D4

PNK/WHT

1970

Low Beam Headlamp Relay Control

D5

ORN

440

Positive Voltage (B+)

D8-D9

--

--

Not Used

D10

BLK

28

Horn Relay Coil Control

D11

--

--

Not Used

D12

PNK

70

Ignition Positive Voltage

E1-E4

--

--

Not Used

E5

DK BLU

15

Turn Signal Lamp Feed-Right Front

E6-E9

--

--

Not Used

E10

PNK

3

Ignition Positive Voltage

E11

--

--

Not Used

E12

ORN

3540

Positive Voltage (B+)

F1

--

--

Not Used

F2

YEL

43

Ignition Positive Voltage

F3

YEL

143

Ignition Positive Voltage

F4

--

--

Not Used

F5

LT BLU

14

Turn Signal Lamp Feed

F6-F7

--

--

Not Used

F8

BLK

58

Cornering Lamp Feed

F9

BLK

911

Cavity Plug

F10-F12

--

--

Not Used

Underhood Junction Block C3


Object Number: 73167  Size: CH

Connector Part Information

    • 15303513
    • 68 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A1-A3

--

--

Not Used

A4

PNK

139

Ignition Positive Voltage

A5

--

--

Not Used

A6

PNK

139

Ignition Positive Voltage

A7

--

--

Not Used

A8

PNK

339

Ignition Positive Voltage

A9-A10

--

--

Not Used

A11

DK GRN/WHT

459

Air Conditioning Compressor Control Relay Output-Coil

A12

--

--

Not Used

B1-B3

--

--

Not Used

B4

PNK/BLK

139

Ignition Positive Voltage

B5

--

--

Not Used

B6

PNK

139

Ignition Positive Voltage

B7

PNK

139

Ignition Positive Voltage

B8

--

--

Not Used

B9

PNK/BLK

239

Ignition Positive Voltage

B10

DK BLU

473

High Speed Fan Relay Control

B11-B12

--

--

Not Used

C1-C3

--

--

Not Used

C4

PNK

139

Ignition Positive Voltage

C5

--

--

Not Used

C8

PNK

439

Ignition Positive Voltage

C9

PNK

539

Ignition Positive Voltage

C10

--

--

Not Used

C11

DK GRN

59

Air Conditioning Compressor Clutch Feed

C12

--

--

Not Used

D1-D3

--

--

Not Used

D4

PNK

139

Ignition Positive Voltage

D5

ORN

240

Battery Positive Voltage (B+)

D8

PNK

439

Ignition Positive Voltage

D9

PNK

539

Ignition Positive Voltage

D10-D12

--

--

Not Used

E1-E2

--

--

Not Used

E3

YEL

269

Starter Enable Relay Coil Control

E4-E6

--

--

Not Used

E7

DK GRN

335

Low Speed Fan Relay Control

E8-E9

--

--

Not Used

E10

PNK

39

Ignition Positive Voltage

E11-E12

--

--

Not Used

F1-F2

--

--

Not Used

F3

PPL

6

Starter Solenoid Feed

F4-F8

--

--

Not Used

F9

PNK

839

Ignition Positive Voltage

F10-F12

--

--

Not Used

Underhood Junction Block C4


Object Number: 258627  Size: CH

Connector Part Information

    • 12160605
    • 2 Way (GRN)

Pin

Wire Color

Circuit No.

Function

A

RED

342

Battery Positive Voltage (B+)

B

RED/WHT

442

Battery Positive Voltage (B+)

Underhood Junction Block C5


Object Number: 258677  Size: CH

Connector Part Information

    • 12146037
    • 2 Way (BLK)

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used

B

RED

642

Battery Positive Voltage (B+)

Rear Junction Block C1


Object Number: 73172  Size: CH

Connector Part Information

    • 15303512
    •  68 Way F Metri-Pack 280 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A1

ORN

1340

Battery Positive Voltage (B+)

A2

--

--

Not Used

A3

BRN/WHT

309

Park Lamp Feed - Right

A4

YEL

32

Fuse Output - Lamps

A5

YEL

32

Fuse Output - Lamps

A6

YEL

32

Fuse Output - Lamps

A7

YEL

32

Fuse Output - Lamps

A8 - A9

--

--

Not Used

A10

BRN

141

Ignition Positive Voltage

A11

ORN

300

Ignition Positive Voltage

A12-B1

--

--

Not Used

B2

YEL

1139

Ignition Positive Voltage

B3

BRN/WHT

309

Park Lamp Feed - Right

B4

PPL

709

Park Lamp Feed - Left

B5

PNK/BLK

1615

Park Relay Output - Coil

B6

LT GRN

275

Transmission Mounted Neutral Safety Switch Output - Park

B7

DK GRN

646

Reverse Relay Coil Control (Export)

B8

LT GRN

24

Back-up Lamp Feed

B9

--

--

Not Used

B10

BRN

141

Ignition Positive Voltage

B11-C1

--

--

Not Used

C2

YEL

1139

Ignition Positive Voltage

C3-C4

--

--

Not Used

C5

ORN

1640

Battery Positive Voltage (B+)

C8

LT GRN

24

Back-Up Lamp Feed

C9

ORN

540

Battery Positive Voltage (B+)

C10

BRN

41

Ignition Positive Voltage

C11

BRN

41

Ignition Positive Voltage

C12

BRN

241

Ignition Positive Voltage

D1

--

--

Not Used

D2

BLK

750

Ground

D3

--

--

Not Used

D4

DK GRN

1483

Control Power Output

D5

--

--

Not Used

D6-D8

--

--

Not Used

D9

PNK

70

Ignition Positive Voltage

D10

DK GRN

1399

Cigar Relay Coil Control

D11

BRN

41

Ignition Positive Voltage

D12

--

--

Not Used

E1

YEL

1139

Ignition Positive Voltage

E2

GRY

120

Fuel Pump Motor Feed - Back

E3

--

--

Not Used

E4

PPL

709

Park Lamp Feed - Left

E5 - E8

--

--

Not Used

E9

ORN

540

Battery Positive Voltage (B+)

E10

ORN

540

Battery Positive Voltage (B+)

E11

BRN

41

Ignition Positive Voltage

E12

ORN

3740

Ignition Positive Voltage

F1

DK GRN/WHT

465

Fuel Pump Relay Feed - Coil

F2

GRY

120

Fuel Pump Motor Feed

F3

WHT

1080

Park Lamp Relay Control

F4

--

--

Not Used

F5

ORN

840

Battery Positive Voltage (B+)

F6-F10

--

--

Not Used

F11

BRN

41

Ignition Positive Voltage

F12

ORN

3740

Battery Positive Voltage (B+)

Rear Junction Block C2


Object Number: 73168  Size: CH

Connector Part Information

    • 15303514
    • 68 Way F Metri-Pack 280 Series (BRN)

Pin

Wire Color

Circuit No.

Function

A1

BLK

1628

Park Brake Relay Output - N.O. Contact A

A2 - A5

--

--

Not Used

A6

DK BLU

75

Ignition Positive Voltage

A7 - A8

--

--

Not Used

A9

BLK/WHT

56

Trunk Release Motor Feed

A10

BRN

253

Trunk Release Relay Feed - Coil

A11

--

--

Not Used

A12

DK BLU

1393

Interior Lamp Relay Control - Front

B1

PNK

1607

Park Brake relay Output - Coil -B

B2

--

--

Not Used

B3

LT GRN/ BLK

1605

Park Brake Relay Output - Coil - A

B4

LT GRN

1627

Park Brake Relay Output - N.O. Contact - B

B5

ORN

2240

Battery Positive Voltage (B+)

B6- B11

--

--

Not Used

B12

GRY

157

Cargo Lamp Switch Output

C1

ORN

3640

Battery Positive Voltage (B+)

C2-C3

--

--

Not Used

C4

ORN

2440

Battery Positive Voltage (B+)

C5

ORN

2240

Battery Positive Voltage (B+)

C8

--

--

Not Used

C9

LT BLU

1344

Trunk Release Relay Output - Coil

C10- D8

--

--

Not Used

D9

PNK

79

Fuel Door Release Solenoid Feed

D10-D12

--

--

Not Used

E1

ORN

2840

Battery Positive Voltage (B+)

E2

PNK

3

Ignition Positive Voltage

E3- E10

--

--

Not Used

E11

GRY

1599

Interior Lamp Relay Control

E12

DK BLU/WHT

149

Courtesy Lamp Feed

F1-F2

--

--

Not Used

F3

PNK

1239

Ignition Positive Voltage

F4

ORN

3240

Battery Positive Voltage B+ (w/ UY4)

F5-F8

--

--

Not Used

F9

WHT

93

Fuel Door Release Relay Output - Coil

F10-F12

--

--

Not Used

Rear Junction Block C3


Object Number: 73167  Size: CH

Connector Part Information

    • 15303513
    • 68 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A1- A6

--

--

Not Used

A7

ORN

740

Battery Positive Voltage (B+)

A8

DK BLU

1333

Damper Driver Relay Output - N.O. Contact

A9

LT BLU /WHT

1112

Real Time Damping Relay Output - Coil

A1- A12

--

--

Not Used

B1

ORN

2940

Battery Positive Voltage (B+)

B2

--

--

Not Used

B3

PNK

1039

Ignition Positive Voltage

B4- B9

--

--

Not Used

B10

RED

1342

Battery Positive Voltage (B+)

B11

--

--

Not Used

B12

ORN

3340

Battery Positive Voltage (B+)

C1

--

--

Not Used

C2

ORN

1040

Battery Positive Voltage (B+)

C3

PNK

1039

Ignition Positive Voltage

C4

WHT

193

Rear Defogger Relay Control

C5

PPL

293

Rear Defogger Element Feed

C6- C9

--

--

Not Used

C10

YEL

321

Electronic Level Control Relay Output - Coil

C11

DK GRN

322

Electronic Level Control Compressor Motor Feed

C12

--

--

Not Used

D1

ORN

2640

Battery Positive Voltage (B+)

D2

ORN

1040

Battery Positive Voltage (B+)

D3

PNK

1039

Ignition Positive Voltage (Export)

D4- C6

--

--

Not Used

D9

ORN

2340

Battery Positive Voltage (B+)

D10

BLK

750

Ground

D11

--

--

Not Used

D12

ORN

2740

Battery Positive Voltage (B+)

E1

--

--

Not Used

E2

ORN

1040

Battery Positive Voltage (B+)

E3

PNK

1039

Ignition Positive Voltage

E4- E6

--

--

Not Used

E7

YEL

1172

Auxiliary Blower Motor Feed

E8

TAN

1592

Rear Blower Motor Relay Coil Feed

E10- E12

--

--

Not Used

F1

ORN

640

Battery Positive Voltage (B+)

F2

ORN

1040

Battery Positive Voltage (B+)

F3

--

--

Not Used

F4

ORN

3140

Battery Positive Voltage (B+) (Export)

F5

--

--

Not Used

F6

BLK

755

RAP Control

F7- F8

--

--

Not Used

F9

ORN

2540

Battery Positive Voltage (B+)

F10

GRY/BLK

690

Courtesy Lamp Relay Control - Coil - Rear

F11

BLU DK/WHT

1495

Courtesy Lamp Switch Output

F12

ORN

1740

Battery Positive Voltage (B+)

Rear Junction Block C4


Object Number: 258627  Size: CH

Connector Part Information

    • 12160605
    • 2 Way (GRN)

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used

B

RED

1242

Battery Positive Voltage (B+)