Diagnostic Aids

WARNING: This page is about a different car, the 2002 GMC Safari, 2002 Chevrolet Astro, 2001 GMC Safari, and 2001 Chevrolet Astro. 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 FOR INTERMITTENT AND POOR CONNECTIONS .
Following a repair the tamper timer needs 10 minutes in order to expire.