Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Use a scan tool in order to inspect the Passlock™ data voltage and the Passlock™ code.
- Inspect the Passlock™ sensor harness for an intermittent or a short to ground. Refer to TESTING WIRING SYSTEMS FOR INTERMITTENT & POOR CONNECTIONS in Wiring Systems.
- Following a repair the tamper timer needs 10 minutes in order to expire.