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

Circuit/System Testing

Midgate Ajar Switch Circuit Test

  1. Ignition OFF, disconnect the harness connector at the midgate module.
  2. Ignition ON, verify the scan tool rear closure ajar switch parameter is inactive.
    • If not the specified value, test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the BCM.
  3. Install a 3A fused jumper wire between the signal circuit terminals 12 and ground. 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.
  4. Ignition OFF, connect the harness connector at the midgate module.
  5. Disconnect the harness connector at the right midgate latch.
  6. Test for less than 1.0 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.
  7. Disconnect the harness connector at the left midgate latch.
  8. Ignition ON, verify the scan tool rear closure ajar switch parameter is active.
    • If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the midgate control module.
  9. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool rear closure ajar switch parameter is inactive.
    • 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 midgate control module.
  10. Connect the harness connector at the left midgate latch.
  11. Install a 3A fused jumper wire between the signal circuit terminal A at the right midgate latch and ground. Verify the scan tool rear closure ajar switch parameter is inactive.
    • 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 left midgate latch.
  12. If all circuits test normal, test or replace the right midgate latch.
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