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Test An: Differential Lock Indicator Inoperative: Testing

  1. If rear axle controls diagnostic system check has been performed, go to next step. If rear axle controls diagnostic system check has not been performed, go to REAR AXLE CONTROLS DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTICS SYSTEM in BODY CONTROL MODULES - AZTEK article.
  2. Operate rear axle controls to verify problem exists. If problem exists, go to next step. If no problem exists, rear axle concern may be intermittent. For aid in diagnosing intermittent problems, see PROBLEM DIAGNOSIS  under INTERMITTENTS.
  3. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). DLC is located under left side of instrument panel. Turn ignition switch to RUN position. Using scan tool, command AWD DISABLE indicator On. If indicator illuminates as commanded, go to next step. If indicator does not illuminate as commanded, go to step  5.
  4. Replace PCM. See POWERTRAIN CONTROL MODULE under REMOVAL & INSTALLATION in BODY CONTROL MODULES - AZTEK article. After repairs are made, go to step  6.
  5. Replace Instrument Panel Cluster (IPC). See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs are made, go to next step.
  6. Operate system to verify repair. If system operates normally, testing is complete. If system does not operate normally, go to step  3.
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