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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1430 (DATA COMMUNICATION SYSTEM)COMPONENT LOCATORDATA COMMUNICATION CONNECTOR END VIEWSBODY CONTROL MODULE (BCM) C3
2002 Chevrolet Avalanche 2500, RWD
Body Control Module (BCM) C3
2002 Chevrolet Avalanche 2500, RWDSECTION Body Control Module (BCM) C3
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
Body Control Module (BCM) C3 Connector Parts Information
Connector Part Information
|
Body Control Module (BCM) C3 Connector Terminal Identification
| Pin | Wire Color | Circuit No. | Function |
|---|---|---|---|
| A1 | WH | 156 | Dome Lamp Control |
| A2 | RD/WH | 812 | 12 Volt Reference |
| A3 | WH | 352 | Headlamp Relay Coil Supply Voltage (T82) |
| A4 | YE | 317 | Fog Lamp Relay Control (T96) |
| A5 | OG/BK | 1445 | Windshield Wiper Relay Control |
| A6 | RD | 2445 | Rear Wiper Relay Control |
| A7 | WH | 1080 | Park Lamp Relay Control (T82) |
| A8 | L-GN/BK | 592 | DRL Relay Control |
| A9 | BN/WH | 230 | I/P Lamps Dimming Control |
| A10 | PU | 1807 | Class 2 Serial Data |
| A11 | - | - | Not Used |
| A12 | TN | 2501 | CAN Low |
| B1 | TN/WH | 816 | A/T Shift Lock Switch Signal (A/T) |
| B2 | BK | 28 | Horn Relay Control |
| B3 | OG/BK | 1057 | Low Reference |
| B4 | GY | 112 | Windshield Wiper Switch Signal 1 |
| B5 | TN | 470 | Low Reference |
| B6 | WH | 193 | Rear Defog Relay Control |
| B7 | YE | 1836 | Security System Sensor Signal |
| B8 | D-GN | 113 | Windshield Wiper Switch Signal 2 |
| B9 | PU | 1807 | Class 2 Serial Data |
| B10 | PU | 1807 | Class 2 Serial Data |
| B11 | - | - | Not Used |
| B12 | TN/WH | 2500 | CAN High |
RENDER: 1.0x
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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.