GM Service Manual Online
For 1990-2009 cars only
Table 1: Powertrain Control Module (PCM) --J1-LT BLU
Table 2: Powertrain Control Module (PCM)-J2-LT BLU
Table 3: Powertrain Control Module (PCM)-Automatic J3 --PNK
Table 4: Powertrain Control Module (PCM)-Manual J3-BRN
Table 5: Powertrain Control Module (PCM)-Automatic J4
Table 6: Underhood Junction Block-Forward Lmap-1999 Only
Table 7: Underhood Junction Block-I/P
Table 8: Underhood Junction Block-I/P
Table 9: Underhood Junction Block-I/P
Table 10: Underhood Junction Block-Engine
Table 11: Uderhood Junction Block-Forward Lamp

Powertrain Control Module (PCM) --J1-LT BLU


Object Number: 923032  Size: CH

Connector Part Information

    • 12110207-J1
    • Lt BLU

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

C1

DK GRN

335

.35

COOLING FAN RELAY CONTROL

C2

TAN/BLK

456

.35

UPSHIFT TT-MANUAL

C3

BRN/WHT

419

.35

MILTT OUT

C4

YEL

172

.35

LOW FUEL TT CONTROL

C5

LT BLU

1888

.35

CRUISE CLUTCH OUT

C6

PPL

1885

.35

SERVICE TT OUT

C7

DK GRN

35

.35

COOLANT HOT TT OUT

C8

PPL

1807A

.35

CLASS 2-DLC

C9

--

--

--

--

C10

DK GRN/WHT

465

.35

FUEL PUMP RELAY OUT

C11

DK GRN

603

.50

A/C REQUEST INPUT

C12

PNK

439

.35

IGN 1

C13

--

--

--

--

C14

BRN

86B

.35

BRAKE SWITCH INPUT

C15

GRA

1884

.35

CRUISE RASC IN

C16

PPL/WHT

455

.35

FUEL GAGE SIGNAL

D1

GRA

729

.35

A/C CLUTCH RELAY CONTROL

D2

WHT

121

.35

TACH OUT

D3

DK GRN

135

.35

COOL TEMP GAGE OUT

D4

WHT

1294A

.35

EVO HI

D5

BRN

1295A

.35

EVO LO

D6

DK GRN

389

.35

SPEED SIGNAL OUT

D7

PNK

1886

.35

CRUISE MOVE OUT

D8

PPL

1807B

.35

CLASS 2 --ABS

D9

DK BLU

1446

.35

FLASH POWER

D10

--

--

--

--

D11

LT GRN

1887

.35

CRUISE WOT/IDLE OUT

D12

--

--

--

--

D13

ORN

1140

.80

12 V BATT

D14

LT BLU

1344A

.35

RKE TRUNK RELAY ENABLE

D15

GRA

416H

.35

5 V REF

D16

BLK

452K

.35

FLASH RTN

Location: Behind Left Side of I/P

Powertrain Control Module (PCM)-J2-LT BLU


Object Number: 923038  Size: CH

Connector Part Information

    • 12110206-J2
    • LT BLU

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

A1

PNK/BLK

1746

.80

CYL 3 INJ

A2

LT BLU/BLK

844

.80

CYL 4 INJ

A3

LT GRN/BLK

1745

.80

CYL 2 INJ

A4

WHT

1310A

.35

EVAP VENT VALVE

A5

BRN

1456A

1456

.50

LIN EGR FEEDBACK IN-SOHC

LIN EGR FEEDBACK IN-DOHC

A6

DK BLU

417A

.35

TPS IN

A7

LT GRN 432A

.50

MAP IN

A8

AN

472A

.35

INTAKE AIR TEMP SENSOR IN

A9

LT GRN/WHT

1749

.35

IAC B HI OUT

A10

LT GRN/BLK

444A

.35

IAC B LO OUT

A11

LT BLU/BLK

1748

.35

IAC A LO OUT

A12

LT BLU/WHT

1747

.35

IAC A HI OUT

B1

DK GRN/WHT

428

.50

CCP OUT

B2

BLK

1744

.80

CYL 1 INJ

B3

YEL

410

.35

COOLANT TEMP IN

B4

GRA

416B

.35

+5 V MAP/LEGR

B5

GRA

474

.35

+5 V TPS

B6

BLK/WHT

451E

.35

GROUND

B7

WHT

423

.35

EST 1-4

B8

ORN

406

.35

EST 2-3

B9

TAN/WHT

551C

551A

.80

GROUND-AUTO

GROUND-MANUAL

B10

LT BLU

697B

697

.50

LIN EGR SOL OUT-SOHC

LIN EGR SL OUT-DOHC

B11

PNK

639A

.50

LIN EGR RECIRC

B12

ORN

1140A

.80

12 V BAT

Location: Behind Left Side of I/P

Powertrain Control Module (PCM)-Automatic J3 --PNK


Object Number: 923042  Size: CH

Connector Part Information

    • 12110245-J3
    • PNK

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

C1

BLK/WHT

1423A

.35

HEATED O2

C2

PNK/BLK

429A

.35

AIR PUMP SOLENOID-1999 ONLY

C3

--

--

--

--

C4

YEL/BLK

68A

.35

COOLANT LEVEL IN

C5

PPL

30E

.35

FUEL LEVEL IN

C6

--

--

--

--

C7

BRN

436

.35

AIR PUMP-1999 ONLY

C8-C9

--

--

--

--

C10

DK BLU

496

.35

KNOCK SENSOR IN

C11

TAN

413B

.80

HO2S LO IN

C12

PPL/WHT

1668

.35

HO2S HI IN

C13

TAN

413A

.80

O2 F LO IN

C14

PPL

412

.80

O2 F HI IN

C15

PPL

401

.35

VSS LO IN

C16

BLK

452G

452GG

.50

LEGR RTN-DOHC

LEGR RTN-SOHC

D1

BLK

452H

.50

MAP RETURN

D2

BLK/WHT

251E

.35

FUEL LEVEL RETURN

D3

BRN/WHT

633

.35

CYL #4 SIGNAL

D4-D6

--

--

--

--

D7

DK GRN

890A

.35

FUEL TANK PRESSURE

D8

BLK

452MD

.35

ECT SENSOR RETURN

D9

ORN/BLK

469B

.35

FUEL TANK PRESSURE SENSOR RETURN-1999 ONLY

D10

BLK

452N

.35

IAT SENSOR RETURN

D11

BLK

452J

.35

TPS RETURN

D12

--

--

--

--

D13

YEL

573

.35

7X HI IN

D14

PPL

574

.35

7X LO IN

D15

YEL

400

.35

VSS HI IN

D16

--

--

--

--

Location: Behind Left Side of I/P

Powertrain Control Module (PCM)-Manual J3-BRN


Object Number: 925221  Size: CH

Connector Part Information

    • 12160779-J3
    • BRN

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

C1

BLK/PWHT

1423

.35

HEATED 02

C2

PNK/BLK

429A

.35

AIR PUMP SOLENOID-1999 ONLY

C3

--

--

--

--

C4

YEL/BLK

68AM

.35

COOLANT LEVEL IN

C5

PPL

30EM

.35

FUEL LEVEL IN

C6

--

--

--

--

C7

BRN

436

.35

AIR PUMP-1999 ONLY

C8-C9

--

--

--

--

C10

DK BLU

496M

.35

KNOCK SENSOR IN

C11

TAN

413BM

.80

HO2S LO IN

C12

PPL/WHT

1668M

.35

HO2S HI IN

C13

TAN

413AM

.80

O2S F LO IN

C14

PPL

412M

.35

O2S F HI IN

C15

PPL

401M

.35

VSS LO IN

C16

BLK

452G

452GG

.50

LEGR RTN-DOHC

LEGR RTN-SOHC

D1

BLK

452HM

.50

MAP RETURN

D2

BLK/WHT

251EM

.35

FUEL LEVEL RETURN

D3

BRN/WHT

633M

.35

CYL #4 SIGNAL

D4-D6

--

--

--

--

D7

DK GRN

890A

.35

FUEL TANK PRESSURE

D8

BLK

452MB

.35

ECT SENSOR RETURN

D9

ORN/BLK

469B

.35

FUEL TANK PRESSURE SENSOR RETURN-1999 ONLY

D10

BLK

452NM

.35

IAT SENSOR RETURN

D11

BLK

452JM

.35

TPS RETURN

D12

--

--

--

--

D13

YEL

573M

.35

7X HI IN

D14

PPL

574M

.35

7X LO IN

D15

YEL

400M

.35

VSS HI IN

D16

--

--

--

--

Location: Behind Left Side of I/P

Powertrain Control Module (PCM)-Automatic J4


Object Number: 923044  Size: CH

Connector Part Information

    • 12110244-J4
    • PNK

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

A1

--

--

--

--

A2

TAN/BLK

422

.50

TCC OUT

A3

DK BLU

1530

.50

MPL OUT

A4

--

--

--

--

A5

PPL

898

.50

4TH OUT

A6

YEL/BLK

1223

.50

3RD OUT

A7

LT GRN

1222

.50

2ND OUT

A8-A9

--

--

--

--

A10

BLK/WHT

451F

.35

GROUND

A11

BLK

452T

.35

TRANS FLUID TEMP SENSOR RTN

A12

--

--

--

--

B1

--

--

--

--

B2

GRA

773

.50

SEL SW B2

B3

YEL

772

.50

SEL SW B1

B4

BLK/WHT

771

.50

SEL SW B0

B5

WHT

776

.50

SEL SW B3

B6-B7

--

--

--

--

B8

ORN/BLK

586

.35

TRANS FLUID TEMP SENSOR IN

B9

TAN/WHT

551B

.80

GROUND

B10

RED/BLK

1230

.35

TURBINE SHAFT SPEED SENSOR HI IN

B11

DK BLU/WHT

1231

.35

TURBINE SHAFT SPEED SENSOR LO IN

B12

--

--

--

--

Location: Behind Left Side of I/P

Underhood Junction Block-Forward Lmap-1999 Only


Object Number: 925383  Size: CH

Connector Part Information

    • 15303502
    • Black

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

A

RED

702

2.0

AIR PUMP RELAY

Location: Underhood-Front Left Side

Underhood Junction Block-I/P


Object Number: 923603  Size: CH

Connector Part Information

    • 12146037
    • Black

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

A

RED

202

3.0

IGN 4 FUSE

B

RED

402

3.0

I/P BATT FUSE

Location: Engine Compartment-Left Front

Underhood Junction Block-I/P


Object Number: 923611  Size: CH

Connector Part Information

    • 12146038
    • Gray

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

A

RED

302

2.0

PWR CONVCE FUSE

B

RED

102A

3.0

IGN 3 FUSE

Location: Engine Compartment-Left Front

Underhood Junction Block-I/P


Object Number: 918886  Size: CH

Connector Part Information

    • 12146036
    • Black

Cavity

Wire Color

Circuit Number

WireSize

Circuit Function

A1

ORN

1040B

1.0

HAZARD FUSE

A2

ORN

1240

2.0

REAR DEFOG FUSE

A3

ORN

1040A

.35

HAZARD FUSE

A4-A10

--

--

--

--

A11

YEL

317

.35

FOG LAMP RELAY COIL +

A12

--

--

--

-

B1-B8

--

--

--

--

B9

BRN

641A

.35

A/C CNTL RELAY COIL +

DRL RELAY COIL +

B10

RED

1633

3.0

ABS RELAY SW

B11-B12

--

--

--

--

C1

ORN

640A

.35

RELAY COIL +

ABS FUSE

C2

ORN

240

.35

PARK LP FUSE

C3

PNK

94A

1.0

WASHER PUMP

C4

--

--

--

--

C5

BRN

1295A

.35

TO PCM-EVO LO

C6-C8

--

--

--

--

C9

ORN

855B

.80

ABS SOL

C10

DK GRN

335

.35

COOL FAN RELAY COIL

C11

LT GRN

24A

2.0

BACK-UP LAMPS

C12

GRA

729

.35

A/C RELAY CONTROL

D1-D2

--

--

--

--

D3

BRN

9J

.35

FOG LAMP RELAY COIL

D4

LT GRN/BLK

529

.35

DRL RELAY COIL

D5-D7

--

--

--

--

D8

ORN

855A

.80

ABS SOL

D9

WHT

1294A

.35

TO PCM-EVO HI

D10

PNK

1632

.35

ABS RELAY COIL

D11

--

--

--

--

D12

PNK

1200C

.50

TO LCS HIGH BEAM

E1

ORN

1140

.80

PCM B FUSE

E2

ORN

540

.50

BRAKE FUSE

E3

PNK

439

.35

PCM 1 FUSE

E4

--

--

--

--

E5

BLK

28B

.35

TO I/P BODY INLINE

E6

DK BLU

1201H

.35

I/P CLUSTER HEADLAMP SIGNAL

E7

DK BLU

1201C

.35

TO LCS-LOW BEAM

E8-E9

--

--

--

--

E10

BRN

25

.35

TO CLUSTER-GENERATOR TT

E11

--

--

--

--

E12

PNK

1200

.35

FOG LAMP SWITCH

F1-F2

--

--

--

--

F3

PNK

3B

2.0

TO IPJB FUSES

F4

RED

458

3.0

TO IPJB FUSES-AUTO

F5

LT BLU

14A

.50

TO IPJB

F6

DK BLU

15A

.50

TO IPJB

F7

TAN

31

.35

OIL PRESSURE TT

F8

YEL

PPL

575-AUTO

6-MAN

5.0

5.0

STARTER RELAY-AUTO

CLUTCH START SW-MAN

F9

BLK

28

.35

TO HORN SW

F10-F12

--

--

--

--

Location: Engine Compartment-Left Front

Underhood Junction Block-Engine


Object Number: 923623  Size: CH

Connector Part Information

    • 12129594
    • Brown

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

A1

ORN

1140A

.80

PCM-12 V BATT

A2-A4

--

--

--

--

A5

WHT/BLK

1526A

.50

TCC ACTUATOR

A6

--

--

--

--

A7

BRN

1295B-DOHC

.35

EVO SOLENOID-DOHC

A8

PPL

6A

6B

3.0

PRNDL START SW

STARTER SOLENOID

A9

WHT

1294B-DOHC

.35

EVO STARTER-DOHC

A10

--

--

--

--

A11

LT BLU

409

3.0

COOLING FAN

A12

--

--

--

--

B1

--

--

--

--

B2

PNK

139E

.80

INJECTOR 4

B3

PNK

239-MAN

239A-AUTO

.50

BACK-UP SWITCH

PRNDL REVERSE SW

B4

WHT

1526

.50

G2 ACTUATOR

B5

PNK

139C

.80

INJECTOR 3

B6

PNK

139B

.80

INJECTOR 2

B7

PNK

139A

.80

INJECTOR 1

B8

GRA

416B

.50

5 V REF-1999 ONLY

B9

TAN

31A

.35

OIL PRESSURE SWITCH

B10

BRN/WHT

25A

.35

GENERATOR

B11

LT GRN

24B

24C

.50

BACK-UP SW MAN

REVERSE SW AUTO

B12

--

--

--

--

C1-C4

--

--

--

--

C5

PNK

639F

.80

HO2S HEATER POWER

C6-C7

--

--

--

--

C8

GRA

416E

.50

5 V REF-1999 ONLY

C9

GRA

416E-DOHC

516EE-SOHC

.50

5 V REF-1998-ONLY

C10

--

--

--

--

C11

BRN

641

.35

GENERATOR

C12

--

--

--

--

D1-D2

--

--

--

--

D3

PNK

1039

.35

ELEC IGNITION MODULE

D4

LT GRN/BLK

1527A

.50

G4 ACTUATOR

D5

LT GRN

1527

.50

G3 ACUTATOR

D6-D7

--

--

--

--

D8

GRA

416F

.50

5 V REF-1999-ONLY

D9

GRA

416F

.50

5 V REF-1998 0NLY

D10-D11

--

--

--

--

D12

TAN/WHT

451M

.80

HO2 GROUND

E1-E4

--

--

--

--

E5

PNK

639A

.50

PCM

E6

BLK/WHT

451F

.35

GROUND

E7

BLK/WHT

451B

.80

REDUNDANT ENGINE GROUND

E8

BLK/WHT

451E

.35

GROUND

E9

GRA

416B

.35

5 V REF-1998 ONLY

E9

PNK/BLK

429B

.35

PCM-1999 ONLY

E110-E11

--

--

--

--

E12

TAN/WHT

451L

.50

HO2S SIGNAL GROUND

F1-F2

--

--

--

--

F3

PNK

639B

.50

EVAP CANISTER PURGE SOLENOID

F4

RED

1525

.50

TFP ACTUATOR

F5

PNK

639C-DOHC

639CC-SOHC

.50

LINR EGR SOLENOID

F6

--

--

--

--

F7

BLK/WHT

451C

.35

ELC IGN MODULE

F8

BLK/WHT

451K

2.0

PRNDL SWITCH

F9

PNK

639F

.80

IGN TO AIR PUMP SOLENOID-1999 ONLY

F10

--

--

--

--

F11

BRN

436

.35

PCM-1999 ONLY

F12

YEL/BLK

68A-AUTO

68AM-MAN

.35

COOLANT LEVEL INPUT

Locatiion: Engine Compartment-Left Front

Uderhood Junction Block-Forward Lamp


Object Number: 918881  Size: CH

Connector Part Information

    • 12129592
    • Gray

Cavity

Wire Color

Circuit Number

Wire Size

Circuit Function

A1-A2

--

--

--

--

A3

PNK

94

1.0

WINDSHIELD WASHER SW

A4

PNK

239C

.35

COOLANT LEVEL SW

A5-A6

--

--

--

--

A7

DK BLU

1201A

.50

RT LO BEAM

A8

DK BLU

1201B

.35

LT LO BEAM

A9

--

--

--

--

A10

BLK

28AA

.35

HORN-HI-1999 ONLY

A11

--

--

--

--

A12

YEL/BLK

68

.35

COOLANT LEVEL SW

B1-B2

--

--

--

--

B3

BRN

9E

.50

RT PARK TURN-HI

B4

BRN

9C

.50

LT PARK TURN-HI

B5

BRN

9A-SL, SW, SC2

9AA-SC1

.50

LT MARK-HI

B6

BRN

9B

.50

RT MARK-HI

B7-B8

--

--

--

--

B9

PNK/BLK

429A

.35

PCM-1998 ONLY

B10

--

--

--

--

B11

PPL

34

.50

RT FOG-HI

B12

PNK

1200A

.80

RT HIGH BEAM

C1-C4

--

--

--

--

C5

DK BLU

15

.50

RT TURN-HI

C6-C10

--

--

--

--

C11

PPL

34A

.50

LT FOG-HI

C12

PNK

1200B

.35

LT HI BEAM

D1

--

--

--

--

D2

ORN

40A

.35

LT HI BEAM

D3

ORN

40B

.35

LT LO BEAM

D4

LT BLU

14

.50

LT TURN-HI

D5-D9

--

--

--

--

D10

RED

702

2.0

AIR PUMP RELAY-1999 ONLY

D11

BLK

28AA

.35

HORN-HI-1998 ONLY

D11

PNK

639X

.80

IGN TO AIR PUMP SOLENOID-1999 ONLY

D12

--

--

--

--

E1-E3

--

--

--

--

E4

BLK

150Z

2.0

LT FORWARD LAMP GROUND

E5

BLK

150G-SL, SW, SC2

150GG-SC1

.50

LT MARK-LO

E6

BLK

150A-SL, SW

150AA-SC

2.0

GROUND

E7-E12

--

--

--

--

F1

ORN

1540A

.35

HORN

F2

ORN

140B

.50

RT LOW BEAM

F3

ORN

140A

.50

RT HIGH BEAM

F4

BLK

150FF

.50

LT PARK/TURN-LO

F5

BLK

150R

.35

LT FOG-LO

F6

BLK

150HH

.35

HORN-LO

F7

--

--

--

--

F8

DK GRN

59

.80

A/C COMPRESSOR CLUTCH COIL-HI

F9-F10

--

--

--

--

F11

RED

78

2.0

AIR PUMP RELAY-1999 ONLY

F12

--

--

--

--

Location: Engine Compartment-Left Front