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Test G: Volt Gauge Inaccurate Or Inoperative

  1. If Instrument Panel Cluster (IPC) diagnostic system check has been performed, go to next step. If IPC diagnostic system check has not been performed, see INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to ON position. Observe BATTERY VOLTAGE parameter in Body Control Module (BCM) data list. If BATTERY VOLTAGE parameter and volt gauge match, system is functioning properly at this time. Check wiring and connectors for intermittent fault conditions. See WIRING DIAGRAMS  . If BATTERY VOLTAGE parameter and volt gauge do not match, go to next step.
  3. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. When repair is complete, go to next step.
  4. Operate system and ensure volt gauge is operating normally. If volt gauge operates normally, repair is complete. If volt gauge does not operate normally, go to step  2 .
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