GM Service Manual Online
For 1990-2009 cars only
Table 1: Cellular Telephone Interface Board
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 Interface Board


Object Number: 62435  Size: CH

Connector Part Information

    • 12047531
    • 10-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

1

RED

2526

Handset Ground

2

BRN

1941

Ignition 3 Voltage

3

GRY/BLK

1798

Handset Data Low Reference

4

PPL

1156

Handset Keypad Data Signal

5

PPL

679

Handset Display Data Signal

6

PNK

1155

Handset Audio Low Reference

7

LT BLU/WHT

1153

Handset Mouthpiece Audio Signal

8

LT BLU

1235

Handset Earpiece Audio Signal

9-10

--

--

Not Used

Cellular Telephone Module


Object Number: 73222  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

E1

BLK

1051

Ground

E2

PPL

1807

Class 2 Serial Data

E3

--

--

Not Used

E4

PPL

679

Handset Display Data Signal

E5

GRY/BLK

1798

Ground

E6

PPL

1156

Handset Keypad Data Signal

E7

BRN/WHT

367

Remote Radio Left Audio Signal

E8

BRN

1941

Ignition 3 Voltage

E9

GRY

344

Cellular Telephone RF Boost Control Signal

E10

--

--

Not Used

E11

DK BLU

658

Cellular Telephone Voice Signal

E12

LT BLU

1235

Handset Earpiece Audio Signal

E13

LT BLU

1153

Handset Mouthpiece Audio Signal

E14

BARE

814

Drain Wire

E15

GRY

655

Cellular Microphone Signal

E16

ORN

2240

Battery Positive Voltage

F1

--

--

Not Used

F2

PPL

1807

Class 2 Serial Data

F3

ORN/BLK

2360

Modem Audio Low Reference

F4

TAN/BLK

2388

Modem Audio Return Signal

F5

BRN/WHT

2387

Modem Audio Transmit Signal

F6 - F7

--

--

Not Used

F8

RED

2526

Handset Ground

F9

BARE

814

Drain Wire

F10

BARE

814

Drain Wire

F11

LT BLU/BLK

659

Cellular Telephone Voice Low Reference

F12

BARE

814

Drain Wire

F13

PNK

1155

Handset Audio Low Reference

F14- F15

--

--

Not Used

F16

GRY

655

Cellular Microphone Signal

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

2507

Audio Transmit Signal

2

--

--

Not Used

3

GRY/BLK

2520

Transceiver Low Reference

4

ORN

2240

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

WHT

2511

Onstar Serial Data (-)

13

--

--

Not Used

14

BARE

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

LT BLU

1235

Handset Earpiece Audio Signal

Vehicle Interface Unit (VIU) C1


Object Number: 258912  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

PPL

1807

Class 2 Serial Data

A3 - A5

--

--

Not Used

A6

BLK/WHT

372

Remote Radio Audio Output (-)

A7

--

--

Not Used

A8

BRN/WHT

367

Remote Radio Left Audio Signal

A9

BARE

814

Drain Wire

A10

LT BLU

1235

Handset Earpiece Audio Signal

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

814

Drain Wire

A16

ORN

2240

Battery Positive Voltage

B1 - B8

--

--

Not Used

B9

GRY

655

Cellular Microphone Signal

B10

BARE

814

Drain Wire

B11

TAN/BLK

2510

Onstar Serial Data Return

B12

WHT

2511

Onstar Serial Data (-)

B13

LT BLU/BLK

2512

Onstar Serial Data (+)

B14

GRY/BLK

2520

Transceiver Low Reference

B15

PPL/WHT

2513

Ignition On Signal

B16

--

--

Not Used

Vehicle Interface Unit (VIU) C2


Object Number: 73222  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

E1

BLK

1051

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

1051

Ground

F2 - F8

--

--

Not Used

F9

BRN/WHT

2517

Keypad Red LED Signal

F10 - F15

--

--

Not Used

F16

ORN

2240

Battery Positive Voltage