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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 >> Power Door Lock Key Cylinder Switches Inoperative >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the driver door latch.
  2. Test for less than 1 ohm between the low reference circuit terminal 8 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the DDM
  3. Ignition ON, verify the scan tool Door Key Cyl Unlock Switch parameter is Idle.
    • If not the specified value, test the signal circuit terminal 9 for a short to ground. If the circuits test normal, replace the DDM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 9 and ground, verify the scan tool Door Key Cyl Unlock Switch parameter is Unlock.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the DDM.
  5. If all circuits tests normal, test or replace the driver door latch.
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