GM Service Manual Online
For 1990-2009 cars only
Table 1: Vehicle Communication Interface Module C1
Table 2: Vehicle Communication Interface Module C2
Table 3: Vehice Interface Unit

Vehicle Communication Interface Module C1


Object Number: 339889  Size: CH

Connector Part Information

    • 90980-11391
    • GY

Pin

Wire Color

Function

1

--

Not Used

2

BK/OR

Rearview Mirror Indicator

3

BK/YE

Rearview Mirror Illumination

4

--

Not Used

5

BK/WH

Ground

6

BK/RD

Accessory

7

--

Not Used

8

WH/BK

Ground

9-10

--

Not Used

11

BK/BU

Signal

12- 15

--

Not Used

16

BK

Battery Supply Voltage

Vehicle Communication Interface Module C2


Object Number: 697023  Size: CH

Connector Part Information

    • 90980-11408
    • GY

Pin

Wire Color

Function

1

BK

Speaker Output Positive

2

WH

Speaker Output Negative

3- 4

--

Not Used

5

BU/RD

Battery Positive Voltage

6- 7

--

Not Used

8

BARE

Drain Wire

9

BK

Microphone Positive

10

BARE

Drain Wire

11- 12

--

Not Used

Vehice Interface Unit


Object Number: 339889  Size: CH

Connector Part Information

    • 90980-AC001
    • BLK

Pin

Wire Color

Function

1

BU/RD

Antenna Signal

2

BU/RD

Serial Data

3

BU/BK

Right Front Door Lock Actuator Signal

4

GN/YE

Horn Relay Signal

5

YE/BK

Hazard Switch Signal

6-8

--

Not Used

9

BU

SIR Voltage

10-11

--

Not used

12

GY

Battery Positive Voltage

13

BK/WH

Ignition Switch - Start Voltage

14

BK

Battery Positive Voltage

15

WH/BK

Ground

16

--

Not used