Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the BCM connector C5.
- Ignition ON, test for voltage at the BCM harness connector terminal 24.
- If voltage is present, test the control circuit for a short to voltage. If all circuits/connections test normal, replace the underhood fuse block.
- If voltage is not present, replace the BCM.