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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 865 (Instrument Panel System Displays And Gauges) >> Diagnostic Information & Procedures >> Instrument Cluster Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the IPC.
  2. Ignition ON, verify that a test lamp illuminates between the RUN/CRANK relay voltage circuit and a ground.
    • If the test lamp does not illuminate, repair the RUN/CRANK voltage circuit for a short to ground or an open/high resistance.
  3. Verify that a test lamp illuminates between the RUN/CRANK voltage circuit and the IPC ground circuit.
    • If the test lamp does not illuminate, repair the IPC ground circuit for an open/high resistance.
  4. If all circuits test normal, replace the IPC
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