Pass-Key Diagnosis
WARNING: This page is about a different car, the 1993 Cadillac Fleetwood. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For complete system diagnosis, see appropriate ANTI-THEFT SYSTEM article in the ACCESSORIES/SAFETY EQUIPMENT Section.
PASS-Key is a sophisticated system that interfaces ECM and starter with a power source, decoder module, starter enable relay, ignition switch and instrument cluster. Check system for following common problems:
- Ensure ignition key resistor pellet is not cracked, dirty or coated. Ensure excess plastic does not exist around pellet contacts.
- Check ignition key pellet sensing contacts in ignition lock cylinder. Look into cylinder lock. If contacts are damaged or are not Silver in color, replace cylinder lock.
- Check related fuses.
- Check security indicator bulb in the instrument panel.
A defective resistor pellet within ignition key or incorrect resistance value of key (15 different assigned values) will prevent vehicle from starting. 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 after correct key is inserted.
If starter enable relay must be replaced, check circuit to starter solenoid for possible short. A short may have caused relay to fail.