GM Service Manual Online
For 1990-2009 cars only
Table 1: Vehicle Interface Unit (VIU) Control Module - C1
Table 2: Vehicle Interface Unit (VIU) Control Module - C2
Table 3: Vehicle Communication Unit (VCU)
Table 4: OnStar Button Assembly
Table 5: Cellular Telephone Microphone

Vehicle Interface Unit (VIU) Control Module - C1


Object Number: 258912  Size: CH

Connector Part Information

    • 12110113
    • 32-Way F Micro-Pack 100 Series (RED)

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

ORN

1044

Radio Class 2 Serial Data

A3

DK GRN

835

Entertainment and Comfort Serial Data

A4-A5

--

--

Not Used

A6

BLK/WHT

372

Remote Radio Audio Output (-)

A7

DK GRN/

WHT

368

Remote Playback Device Right Audio Signal

A8

BRN/WHT

367

Remote Playback Device Left Audio Signal

A9

BARE

814

Drain Wire

A10

LT BLU

1235

Audio Low Reference

A11

BRN/WHT

2506

Audio Return Signal

A12

DK GRN/

WHT

2507

Audio Transmit Signal

A13

BARE

1792

Drain Wire

A14

GRY/BLK

2508

Microphone Signal

A15

BARE

1782

Drain Wire

A16

ORN

2540

Battery Positive Voltage

B1-B8

--

--

Not Used

B9

GRY

655

Cellular Microphone Signal

B10

BARE

1705

Drain Wire

B11

TAN/BLK

2510

OnStar Serial Data Return

B12

DK BLU/

WHT

2511

OnStar Serial Data (-)

B13

LT BLU/

BLK

2512

OnStar Serial Data (+)

B14

GRY

2520

Transceiver Low Reference

B15

PPL/WHT

2513

Ignition ON Signal

B16

--

--

Not Used

Vehicle Interface Unit (VIU) Control Module - C2


Object Number: 73222  Size: CH

Connector Part Information

    • 12110115
    • 32-Way F Micro-Pack 100 Series (BLU)

Pin

Wire Color

Circuit No.

Function

E1

BLK

1850

Ground

E2-E3

--

--

Not Used

E4

DK GRN/

WHT

2514

Keypad Signal

E5

YEL/BLK

2516

Keypad Green LED Signal

E6

LT GRN/

BLK

2515

Keypad Supply Voltage

E7-E15

--

--

Not Used

E16

ORN

2240

Battery Positive Voltage

F1

BLK

1850

Ground

F2-F3

--

--

Not Used

F4

ORN/BLK

2518

Keypad Low Reference

F5

--

--

Not Used

F6

PNK

739

Ignition 1 Voltage & UE1

F7-F8

--

--

Not Used

F9

BRN/WHT

2517

Keypad Red LED Signal

F10

--

--

Not Used

F11

BLK

707

RAP Relay Coil Supply Voltage & UE1

F12-F15

--

--

Not Used

F16

ORN

2240

Battery Positive Voltage

Vehicle Communication Unit (VCU)


Object Number: 585586  Size: CH

Connector Part Information

    • 205207-1
    • 25 - Way F (BLK)

Pin

Wire Color

Circuit No.

Function

1

DK GRN/

WHT

2507

Audio Transmit Signal

2

--

--

Not Used

3

BLK

2520

Transceiver Low Reference

4

ORN

2540

Battery Positive Voltage

5

PPL/WHT

2513

Ignition On Signal

6

BRN/WHT

2506

Audio Return Signal

7-10

--

--

Not Used

11

LT BLU/

BLK

2512

OnStar Serial Data (+)

12

DK BLU/

WHT

2511

OnStar Serial Data (-)

13

--

--

Not Used

14

BLK

1792

Drain Wire

15

GRY/BLK

2508

Microphone Signal

16-17

--

--

Not Used

18

TAN/BLK

2510

Onstar Serial Data Return

19-23

--

--

Not Used

24

BLK/WHT

1235

Audio Low Reference

25

--

--

Not Used

OnStar Button Assembly


Object Number: 62439  Size: CH

Connector Part Information

    • 12047886
    • 8-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN/

BLK

2515

Keypad Supply Voltage

B

DK GRN/

WHT

2514

Keypad Signal

C-D

--

--

Not Used

E

ORN/BLK

2518

Keypad Low Reference

F

YEL/BLK

2516

Keypad Green LED Signal

G

BRN/WHT

2517

Keypad Red LED Signal

H

--

--

Not Used

Cellular Telephone Microphone


Object Number: 82383  Size: CH

Connector Part Information

    • 12047662
    • 2-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BARE

1705

Drain Wire

B

GRY

655

Cellular Microphone Signal