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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 187 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> Instrument Cluster Inoperative >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the IPC.
  2. Ignition ON, verify that a test lamp illuminates between the following RUN/CRANK relay voltage circuits listed below and a ground.
    • RUN/CRANK Relay Terminal 2 (Z75)
    • RUN/CRANK Relay Terminal 5 (X88/Z88)
    • 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 following RUN/CRANK relay voltage circuit(s) and ground circuit(s) listed below:
    • RUN/CRANK Relay Terminal 2 (Z75)
    • RUN/CRANK Relay Terminal 5 (X88/Z88)
    • Ground Terminal 5 (Z75)
    • Ground Terminal 13 (X88/Z88)
    • 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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