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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Lift Gate/Lift Gate Window Ajar Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect both the liftgate and liftglass ajar switches.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Liftgate Ajar Switch parameter is Inactive.
    • If not Inactive, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. Ignition ON, check to see that the rear access open message is not displayed.
    • If the message is displayed in the DIC, replace the IPC.
  5. Ignition ON, install a 3-amp fused jumper wire between the signal circuit and ground. Verify the scan tool Liftgate Ajar Switch parameter is Active.
    • If not Active, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the BCM.
  6. Ignition ON, check to see that the rear access open message is displayed.
    • If the message is not displayed in the DIC, replace the IPC.
  7. If all circuits test normal, test or replace the liftgate ajar switch or the liftglass ajar switch.
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