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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Cadillac Eldorado and 2001 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the DIAGNOSTIC SYSTEM CHECK? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, command the PARK relay ON and OFF. Does the PARK relay turn ON and OFF with each command? If so, check for intermittent condition. See SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING. If not, go to next step.
  3. Turn OFF the ignition. Disconnect the PARK relay. Turn ON the ignition, with the engine OFF. Probe the ignition 1 voltage circuit (Pink wire) at the PARK relay with a test lamp that is connected to a good ground. Does the test lamp illuminate? If so, go to next step. If not, go to step  10 .
  4. Connect a test lamp between the control circuit (Orange/Black wire) and the ignition 1 voltage circuit (Pink wire) at the PARK relay. With a scan tool, command the PARK relay ON and OFF. Does the test lamp turn ON and OFF with each command? If so, go to step  8 . If not, go to next step.
  5. Does the test lamp remain illuminated with each command? If so, go to step  7 . If not, go to next step.
  6. Test the PARK relay control circuit (Orange/Black wire) for a short to battery voltage. Did you find and correct the condition? If so, go to step  13 . If not, go to step  9 .
  7. Test the PARK relay control circuit (Orange/Black wire) for a short to ground. Did you find and correct the condition? If so, go to step  13 . If not, go to step  9 .
  8. Inspect for poor connections at the PARK relay. Did you find and correct the condition? If so, go to step  13 . If not, go to step  11 .
  9. Inspect for poor connections at PZM harness connector. Did you find and correct the condition? If so, go to step  13 . If not, go to step  12 .
  10. Repair the open in the PARK relay ignition 1 voltage circuit. After repairs, go to step  13 .
  11. Replace the PARK relay located in rear fuse block. After repairs, go to step  13 .
  12. Replace PZM. See appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. After repairs, go to step  13 .
  13. Use the scan tool in order to clear the DTCs. Operate the vehicle within the CONDITIONS FOR RUNNING DTC  . Does the DTC reset? If so, go to step  2 . If not, system is okay.
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