PASS-KEY Diagnosis

WARNING: This page is about a different car, the 1990 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

PASS-KEY is a sophisticated system which interfaces the CCM, ECM and starter with a power source, starter enable relay, ignition switch and instrument cluster. Before replacing the CCM, check the system for the following common problems.

Check ignition key pellet sensing contacts in the ignition lock cylinder. Look into cylinder lock. If contacts are damaged, replace cylinder lock.
Check ECM and GAGES fuses
Check security indicator bulb in the instrument panel.
A defective resistor pellet within the ignition key or incorrect resistance value of key (15 different assigned values) will cause vehicle not to start. Key must be correct electrically and mechanically. If incorrect key is used to try to start vehicle, decoder will not allow vehicle to start for 2-4 minutes, even if correct key is inserted.

NOTE: Testing and servicing CCM requires special test equipment and documentation.