GM Service Manual Online
For 1990-2009 cars only
Table 1: C1 Black 32 Pin Connector End View
Table 2: Black C2 24 Pin Connector End View

C1 Black 32 Pin Connector End View


Object Number: 31454  Size: CF

Connector Part Information

    • 12045575
    • Black C1 32 Pin Connector

Pin

Wire Color

Circuit No.

Function

C1

--

--

Not Used

C2

--

--

Not Used

C3

LT GRN/BLK

444

IAC Coil "B" Low

C4

LT GRN/BLK

1749

IAC Coil "B" High

C5

LT BLU/WHT

1747

IAC Coil "A" High

C6

LT BLU/BLK

1748

IAC Coil "A" Low

C7

--

--

Not Used

C8

--

--

Not Used

C9

ORN/BLK

434

Crank Signal

C10

YEL

410

ECT Signal

C11

LT/GRN

432

MAP Signal

C12

--

--

Not Used

C13

DK/BLU

417

TP Signal

C14

GRY

416

5 V Reference (TP and MAP)

C15

--

--

Not Used

C16

ORN

740

Battery Fe

D1

BLK/WHT

451

System Ground

D2

ORN/BLK

469

MAP Sensor Ground

D3

--

--

Not Used

D4

WHT

423

IC Control

D5

TAN/BLK

424

IC Bypass

D6

TAN

413

O2S Ground

D7

PPL

412

O2S Signal

D8

--

--

Not Used

D9

--

--

Not Used

D10

--

--

Not Used

D11

--

--

Not Used

D12

--

--

Not Used

D13

--

--

Not Used

D14

DK GRN

468

Injector "1" Ground

D15

--

--

Not Used

D16

DK BLU

467

Injector "2" Control

Black C2 24 Pin Connector End View


Object Number: 31460  Size: CF

Connector Part Information

    • 12047946
    • Black C2 24 Pin Connector

Pin

Wire Color

Circuit No.

Function

A1

DK/GRN/WHT

465

Fuel Pump Relay Control

A2

DK /BLU

1938

Engine Over Speed Lamp Control

A3

DK/GRN

1474

Engine Speed Governer Control

A4

GRY

1954

EGR Control

A5

BRN/WHT

419

MIL Control

A6

PNK

39

Ignition Feed

A7

--

--

Not Used

A8

ORN

461

Engine Data

A9

BLK/WHT

448

Diagnostic Test

A10

RED

381

VSS Signal

A11

BLK

452

TP and ECT Ground

A12

BLK/WHT

451

System Ground

B1

ORN

740

Battery Feed

B2

GRY

120

Fuel Pump Signal

B3

RED/BLK

453

IC Reference Low

B4

--

--

Not Used

B5

PPL/WHT

430

C Reference High

B6

--

--

Not Used

B7

ORN

406

Knock Signal

B8

DK/GRN

59

A/C Signal

B9

--

--

Not Used

B10

ORN/BLK

1786

Neutral Signal

B11

--

--

Not Used

B12

--

--

Not Used