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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 192 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> Liftgate/Liftgate Window Ajar Indicator Malfunction (w/o E61) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
  2. Test for less than 1 ohm between the ground circuit terminal 5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Disconnect the harness connector at the liftgate window latch assembly.
  4. Test for less than 1 ohm between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  5. Ignition ON, verify the scan tool Rear Closure Ajar Sw. parameter is Inactive.
    • If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the BCM.
  6. Connect a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Rear Closure Ajar Sw. 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.
  7. Ignition OFF, connect the harness connector at the liftglass window latch assembly.
  8. Ignition ON, observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the liftglass. The parameter should change from Inactive to Active
    • If the value does not change, test or replace the liftglass window latch assembly.
  9. If all circuits test normal, test or replace the liftgate latch assembly.
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