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.
Vehicle Communication Unit (VCU)
2001 Chevrolet Suburban C1500SECTION Vehicle Communication Unit (VCU)
Vehicle Communication Unit (VCU)
| Connector Part Information |
|
||
|---|---|---|---|
| Pin | Wire Color | Circuit No. | Function |
| 1 | DK GRN/ WHT |
2507 | Audio Transmit Signal |
| 2 | - | - | Not Used |
| 3 | BLK | 2520 | Transceiver Low Reference |
| 4 | ORN | 2540 | 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 | DK BLU/ WHT |
2511 | OnStar Serial Data (-) |
| 13 | - | - | Not Used |
| 14 | BLK | 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 | BLK/WHT | 1235 | Audio Low Reference |
| 25 | - | - | 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.