Vehicle Communication Unit (VCU)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2001 GMC Yukon XL, 2001 GMC Yukon, 2001 GMC Sierra, 2001 GMC Cab & Chassis Sierra, and 2001 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
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 |