Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSWIRING DIAGRAMSOEM CONNECTOR END VIEWSCONNECTOR END VIEWSVEHICLE INTERFACE UNIT (VIU) CONTROL MODULE - C1 CONNECTOR END VIEW
2002 Chevrolet Avalanche 2500, RWD
Vehicle Interface Unit (VIU) Control Module - C1 Connector End View
2002 Chevrolet Avalanche 2500, RWDSECTION Vehicle Interface Unit (VIU) Control Module - C1 Connector End View
Vehicle Interface Unit (VIU) Control Module - C1 Connector End View
| Connector Part Information |
|
||
|---|---|---|---|
| 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 |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.