Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connectors at the BCM.
- Ignition OFF and scan tool disconnected, open and close the drivers door, and wait 1 minute. Test for less than 5 ohms between the following ground circuit terminals and ground:
- Terminal 1 X3
- Terminal 5 X3
- Terminal 9 X4
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify that a test lamp illuminates between the following B+ circuit terminals and ground:
- Terminal 3 X3
- Terminal 10 X4
- If the test lamp does not illuminate, test the appropriate B+ circuit for a short to ground or an open/high resistance.
- If all circuits test normal, replace the BCM.