Circuit/System Verification
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.
- Verify that following BCM DTCs are not present:
- U1814
- U2099
- B1428
- B1370
- B1380
- B1440
- B1441
- If any listed DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnose that DTC prior to this diagnostic.
- Verify that at least 1 module that communicates on high speed GMLAN serial data communicates with the scan tool.
- If no module communicates on high speed GMLAN serial data, refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
- Verify that at least 1 module, excluding BCM, that communicates on low speed GMLAN serial data communicates with the scan tool.
- If no module communicates on low speed GMLAN serial data, excluding BCM, refer to Scan Tool Does Not Communicate with Low Speed GMLAN Device .