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

Cellular Telephone Microphone


Object Number: 35441  Size: CH

Connector Part Information

    • 12047663
    • 2-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BARE

2012

Drain Wire Return-Right Rear Audio

B

GRY

655

Cellular Telephone Microphone Signal

Cellular Telephone Module


Object Number: 280764  Size: CH

Connector Part Information

    • 12064993
    • 6 Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5

GRY

344

Cellular Phone Boost Control Signal, Right Front

6

--

--

Not Used

7

BLK/WHT

1351

Ground

8

ORN

2240

Fused Output (Battery)

9-10

--

--

Not Used

Vehicle Communication Unit (VCU)


Object Number: 585586  Size: CH

Connector Part Information

    • AMP 205207-1
    • 25-Way F DB-25 (GRY)

Pin

Wire Color

Circuit No.

Function

1

DK GRN/WHT

965

Transceiver Audio Transmit Signal

2

--

--

Not Used

3

GRY/BLK

1798

Transceiver Digital Low Reference

4

ORN

2240

Transceiver Battery Positive Voltage

5

PPL/WHT

971

Transceiver Ignition Sense Signal

6

BRN/WHT

964

Transceiver Audio Return Signal

7 - 10

--

--

Not Used

11

LT BLU/BLK

970

Transceiver TRU Signal

12

WHT

969

Transceiver CMP Signal

13

--

--

Not Used

14

BARE

966

Transceiver Microphone Drain Wire

15

GRY/BLK

967

Transceiver Microphone Signal

16 - 17

--

--

Not Used

18

TAN/BLK

968

Transceiver RTN Signal

19 - 23

--

--

Not Used

24

LT BLU

981

Transceiver Audio Low Reference

25

--

--

Not Used

Vehicle Interface Unit (VIU) C1


Object Number: 258912  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

PPL

1807

Class 2 Serial Data

A3

DK GRN

835

Entertainment and Comfort Serial Data

A4-A5

--

--

Not Used

A6

BLK/WHT

372

Voice Low Reference

A7

DK GRN/WHT

368

Remote Radio Right Audio Signal

A8

BRN/WHT

367

Voice Signal

A9

BARE

1705

Drain Wire

A10

LT BLU

981

Transceiver Audio Low Reference

A11

BRN/WHT

964

Transceiver Audio Return Signal

A12

DK GRN/WHT

965

Transceiver Audio Transmit Signal

A13

BARE

966

Transceiver Microphone Drain Wire

A14

GRY/BLK

967

Transceiver Microphone Signal

A15

BARE

1782

Transceiver Audio Drain Wire

A16

ORN

2240

Transceiver Battery Positive Voltage

B1 - B8

--

--

Not Used

B9

GRY

655

Cellular Telephone Microphone Signal (w/o UV8)

B9

GRY/BLK

655

Cellular Telephone Microphone Signal (w/UV8)

B10

BARE

1705

Drain Wire

B11

TAN/BLK

968

Transceiver RTN Signal

B12

WHT

969

Transceiver CMP Signal

B13

LT BLU/BLK

970

Transceiver TRU Signal

B14

GRY/BLK

1798

Transceiver Digital Low Reference

B15

PPL/WHT

971

Transceiver Ignition Sense Signal

B16

--

--

Not Used

Vehicle Interface Unit (VIU) C2


Object Number: 73222  Size: CH

Connector Part Information

    • 12110113
    • 32-Way F Micro-Pack 150 Series (RED)

Pin

Wire Color

Circuit No.

Function

E1

BLK

1350

Ground

E2 - E3

--

--

Not Used

E4

DK GRN/WHT

2514

OnStar Keypad Control Signal

E5

YEL/BLK

2516

OnStar Keypad Green LED Signal

E6

LT GRN/BLK

2515

OnStar Keypad Power Signal

E7 - E10

--

--

Not Used

E11

BLK

28

Horn Relay Control

E12-E13

--

--

Not Used

E14

BLK/WHT

624

Headlamp Alarm Signal

E15

--

--

Not Used

E16

ORN

2240

Battery Positive Voltage

F1

BLK

1351

Ground

F2 - F8

--

--

Not Used

F9

BRN/WHT

2517

OnStar Keypad Red LED Signal

F10 - F15

--

--

Not Used

F16

ORN

2240

Battery Positive Voltage