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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 - Rear >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the X1 and X3 harness connectors at the I/P fuse block.
  2. Test for less than 1 ohm between the ground circuit terminal E1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between control circuit terminal A2 and ground.
  4. Ignition ON, command the door lock ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Connect a test lamp between control circuit terminal A3 and B+.
  6. Command the door unlock ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM.
  7. Ignition OFF, connect the harness connectors at the I/P fuse panel. Disconnect the harness connector at the appropriate rear door lock.
  8. Test for less than 2.0 ohms between the control circuit terminal listed below and ground:
    • Endgate lock actuator terminal A
    • Endgate lock actuator terminal B
    • LR passenger door lock terminal 2
    • LR passenger door lock terminal 3
    • RR passenger door lock terminal 5
    • RR passenger door lock terminal 6
    • 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 I/P fuse panel
  9. Ignition ON, connect a test lamp between the control circuit terminals of the door lock listed below.
    • Endgate lock actuator terminals A and B
    • LR passenger door lock terminals 2 and 3
    • RR passenger door lock terminals 5 and 6
  10. Command the door to LOCK and UNLOCK with a scan tool. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
    • If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the I/P fuse panel.
  11. If all circuits test normal, test or replace the rear door lock.
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