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Test U: High Beam Indicator Inoperative

  1. If lighting system diagnostic systems check has been performed, go to next step. If lighting system diagnostic systems check has not been performed, go to LIGHTING SYSTEM DIAGNOSTIC SYSTEMS CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODES - CATERA article.
  2. Check high beam indicator bulb for open. To access bulb, remove Instrument Panel Cluster (IPC). See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  5 .
  3. Turn ignition switch to OFF position. Disconnect Instrument Panel Cluster (IPC) 26-pin harness connector C1. Turn ignition switch to RUN position. Check for open or high resistance in high beam supply voltage circuit (White wire) between IPC harness connector C1 terminal No. 9 and Body Control Module (BCM) harness connector C2 terminal C8. See Figure and Figure . If no problem is found, go to next step. If problem is found, repair as necessary and go to step  6 .
  4. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs are made, go to step  6 .
  5. Replace high beam indicator bulb. After repairs are made, go to next step.
  6. Connect all harness connectors and components that were disconnected. Verify that high beam indicator operates normally. If high beam required indicator operates normally, testing is complete. If high beam indicator does not operate normally, go to step  2 .
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