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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 Locks Inoperative - Front >> Circuit/System Testing

Circuit/System Testing

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Driver Door Lock Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the DDS.
  2. Test for less than 1 ohm between the ground circuit terminal 6 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit listed below and ground.
    • B+ circuit terminal 2
    • B+ circuit terminal 4
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, connect the X1 harness connector at the DDS and disconnect the harness connector at the driver door latch.
  5. Test for less than 2 ohms between the control circuit terminal 3 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the DDS.
  6. Test for less than 2 ohms between the control circuit terminal 2 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the DDS.
  7. Ignition ON, connect a test lamp between the control circuit terminal 3 and control circuit terminal 2.
  8. Command the door to LOCK and UNLOCK by using the driver door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the DDS.
  9. If the circuits test normal, test or replace the driver door latch.

Passenger Door Lock Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the PDS.
  2. Test for less than 1 ohm between the ground circuit terminal 6 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit listed below and ground.
    • B+ circuit terminal 2
    • B+ circuit terminal 4
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, connect the X1 harness connector at the PDS and disconnect the harness connector at the passenger door latch.
  5. Test for less than 2 ohms between the control circuit terminal 5 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the PDS.
  6. Test for less than 2 ohms between the control circuit terminal 6 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If circuits test normal, replace the PDS.
  7. Ignition ON, connect a test lamp between the control circuit terminal 5 and control circuit terminal 6.
  8. Command the door to LOCK and UNLOCK by using the passenger door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the PDS.
  9. If the circuits test normal, test or replace the passenger door latch.
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