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Test AE: 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 in BODY CONTROL MODULES - DEVILLE article.
  2. Turn ignition off. Disconnect Powertrain Control Module 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 INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. Check for short to ground in Brown/White wire between IPC harness connector C2 terminal A8 and PCM harness connector C1 terminal No. 32. See Figure. If no problem was found, go to next step. If a problem was found and corrected, go to step  6.
  4. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to step  6.
  5. Replace PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION in BODY CONTROL MODULES - DEVILLE article. After repairs, go to next step.
  6. Recheck operation on MIL. If MIL operates properly, repair is complete. If MIL does not operate properly, return to step  2.
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