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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Door Lock Systems & Door Handles) >> Diagnostic Information and Procedures >> Power Lift Gate Inoperative >> Circuit/System Testing

Circuit/System Testing

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Liftgate Handle Switch Circuit Test

  1. Disconnect the harness connector at the liftgate handle switch.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the liftgate control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Liftgate Handle Sw. Status 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 liftgate control module.
  5. If all circuits test normal, test or replace the liftgate handle switch.

Liftgate Close Switch Circuit Test

  1. Disconnect the harness connector at the liftgate close switch.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify the scan tool Liftgate Handle Sw. Status parameter is Inactive.
    • If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the liftgate control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool Liftgate Handle Sw. Status 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 liftgate control module.
  5. If all circuits test normal, test or replace the liftgate close switch.

Overhead Console Switch Circuit Test

  1. Disconnect the harness connector at the overhead console switch.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal C and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify the scan tool LGM Disable Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the liftgate control module.
  4. Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool LGM Disable 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 liftgate control module.
  5. Verify the scan tool Front Control Switch parameter is Inactive.
    • If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the liftgate control module.
  6. Install a 3A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool Front Control 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 liftgate control module.
  7. If all circuits test normal, test or replace the overhead console switch.
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