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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Electrical >> Gauges >> Displays And Gages >> Diagnostic Information and Procedures >> Driver Information Center (DIC) Switch Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the DIC switch assembly.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 2 and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit terminal 5 and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  4. Ignition ON, verify all of the scan tool DIC Switch parameters are Inactive.
    • If any are not Inactive, test the signal circuits terminal 1 and terminal 3 for a short to ground. If the circuits test normal, replace the IPC.
  5. Ignition ON, install a 3-amp fused jumper wire between the signal circuits terminal 1, terminal 3 and ground. Verify all of the scan tool DIC Switch parameters are Active.
    • If any are not Active, test the signal circuits for a short to voltage or an open/high resistance. If the circuit tests normal, replace the IPC.
  6. If all the circuits test normal, test or replace the DIC switch assembly.
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