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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Vehicle Access >> Diagnostic Information and Procedures >> Liftgate Ajar Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connectors at the liftgate ajar switches.
  2. Test for less than 1.0 ohm of resistance between the ground circuit terminals A and ground.
    • If greater than the specified range, test the affected ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool rear closure ajar switch parameter is inactive.
    • If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between each of the signal circuit terminals B and the ground circuit terminals A. Verify the scan tool rear closure ajar switch parameter is active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the affected liftgate ajar switch.
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