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Malfunction Indicator Light Always On

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment, inside air filter housing. Turn ignition on. If MIL illuminates, go to next step. If MIL does not illuminate, go to step  5.
  3. Turn ignition off. Remove Instrument Panel Cluster (IPC). See REMOVAL & INSTALLATION in appropriate ANALOG INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. Using a test light connect to positive battery voltage, probe Brown/White wire at terminal A8 (DeVille and Seville) or terminal A3 (Eldorado) at IPC C2 harness connector. See Figure or Figure . If test light does not illuminate, go to step  6. If test light illuminates, repair short to ground in Brown/White wire. After repairs, go to step  6.
  4. Replace IPC. After repairs, go to step  6.
  5. Replace PCM. Program replacement PCM. See PROGRAMMING . After repairs, go to next step.
  6. Recheck operation on MIL. If MIL operates properly, repair is complete. If MIL does not operate properly, go to step  2.
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