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Malfunction Indicator Light Inoperative

  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. On DeVille and Seville, remove and inspect fuse No. 12 (IGN 1 fuse) from rear fuse block. See Fig 1 or Fig 2 . On Eldorado, remove and inspect RLY IGN 1 fuse from rear fuse block. See Fig 3. On all models, rear fuse block is located underneath driver's side rear seat. If fuse is okay, reinstall fuse and go to next step. If fuse is blown, go to step  10.
    Fig 1: Identifying Rear Fuse Black (DeVille)
    G00053862Courtesy of GENERAL MOTORS CORP.
    Fig 2: Identifying Rear Fuse Black (Seville)
    G00053857Courtesy of GENERAL MOTORS CORP.
    Fig 3: Identifying Rear Fuse Black (Eldorado)
    G00050892Courtesy of GENERAL MOTORS CORP.
  3. Ensure ignition is off. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment, inside air filter housing. Turn ignition on. Connect a 3-amp fused jumper wire between ground and terminal No. 32 (Brown/White wire) at PCM C1 harness connector. See Fig 4. Observe Malfunction Indicator Light (MIL). If MIL does not illuminate, go to next step. If MIL illuminates, go to step  9.
  4. Check condition of fused jumper wire. If fused jumper wire is blown, go to step  11. If fused jumper wire is not blown, go to next step.
  5. Turn ignition off. Remove Instrument Panel Cluster (IPC). See REMOVAL & INSTALLATION in appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. On Deville and Seville, check continuity of Brown/White wire between terminal A8 at IPC C2 harness connector and terminal No. 32 at PCM C1 harness connector. See Fig 4 and Fig 5 . On Eldorado, check continuity of Brown/White wire between terminal A3 at IPC C2 harness connector and terminal No. 32 at PCM C1 harness connector. See Fig 4 and Fig 6 . On all models, if continuity exists, go to next step. If continuity does not exist, repair open in Brown/White wire. After repairs, go to step  14.
  6. Using a test light connected to ground, probe terminal A3 (Pink wire) at IPC C2 harness connector (DeVille and Seville) or C1 harness connector (Eldorado). See Fig 5 or Fig 6 . Turn ignition on. If test light does not illuminate, go to next step. If test light illuminates, go to step  8.
  7. Repair open in Pink wire between IPC and rear fuse block. After repairs, go to step  14.
  8. Check for faulty connections at IPC connectors. Repair connectors as necessary. After repairs, go to step  14. If connectors are okay, go to step  12.
  9. Check for faulty connections at PCM connectors. Repair connectors as necessary. After repairs, go to step  14. If connectors are okay, go to step  13.
  10. Repair short to ground in Pink wire between IPC and rear fuse block. Replace fuse. After repairs, go to step  14.
  11. Repair short to voltage in Brown/White wire between terminal A8 (DeVille and Seville) or terminal A3 (Eldorado) at IPC C2 harness connector and terminal No. 32 at PCM C1 harness connector. After repairs, go to step  14.
  12. Replace IPC. After repairs, go to step  14.
  13. Replace PCM. Program replacement PCM. See PROGRAMMING . After repairs, go to next step.
  14. Recheck operation of MIL. If MIL operates properly, repair is complete. If MIL does not operate properly, go to step  2.
Fig 4: Identifying Powertrain Control Module Connector Terminals
G98G00865Courtesy of GENERAL MOTORS CORP.
Fig 5: Identifying Instrument Panel Cluster C2 Connector Terminals (DeVille & Seville)
G00053856Courtesy of GENERAL MOTORS CORP.
Fig 6: Identifying Instrument Panel Cluster C1 & C2 Connector Terminals (Eldorado)
G00053865Courtesy of GENERAL MOTORS CORP.
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