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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1557 (Door Lock System & Door Handles) >> Diagnostic Information and Procedures >> Power Door Locks Malfunction (RPO AU3 Without AN3/DL3) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Door Lock Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
  2. Test for less than 30 Ω between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Door Unlock Sw parameter is Inactive.
    • If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM.
      • With YE9 driver door lock switch terminal D
      • Without YE9 driver door lock switch terminal E
      • With YE9 passenger door lock switch terminal D
      • Without YE9 passenger door lock switch terminal E
  4. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Door Unlock Sw parameter is Active.
    • With YE9 driver door lock switch terminal D
    • Without YE9 driver door lock switch terminal E
    • With YE9 passenger door lock switch terminal D
    • Without YE9 passenger door lock switch terminal E
    • 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.
  5. Verify the scan tool Door Lock Sw parameter is Inactive.
    • If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the BCM
      • Without YE9 driver door lock switch terminal D
      • With YE9 driver door lock switch terminal E
      • Without YE9 passenger door lock switch terminal D
      • With YE9 passenger door lock switch terminal E
  6. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Door Lock Sw parameter is Active.
    • Without YE9 driver door lock switch terminal D
    • With YE9 driver door lock switch terminal E
    • Without YE9 passenger door lock switch terminal D
    • With YE9 passenger door lock switch terminal E
    • 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.
  7. If all circuits test normal, test or replace the door lock switch.

Door Lock Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the I/P fuse block.
  2. Test for less than 30 Ω 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 the X1 harness connector and disconnect the X2 and X3 harness connectors.
  4. Connect a test lamp between the control circuit terminal listed below and ground:
    • X2 harness connector, control circuit terminal A3 (Without YE9)
    • X3 harness connector, control circuit terminal A2 (With YE9)
  5. Ignition ON, command the doors to LOCK with a scan tool, the test lamp should illuminate during the LOCK command.
    • 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.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM
  6. Connect a test lamp between the X3 harness connector control circuit terminal A3 and B+.
  7. Command the doors to UNLOCK with a scan tool, the test lamp should illuminate during the UNLOCK command.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM
  8. Connect a test lamp between the control circuit terminal listed below and B+:
    • X3 harness connector, control circuit terminal A2 (Without YE9)
    • X2 harness connector, control circuit terminal A2 (With YE9)
  9. Command the doors to UNLOCK by using the driver door lock switch, the test lamp should illuminate during the UNLOCK command.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
  10. Ignition OFF, connect the X2 and X3 harness connectors at the I/P fuse block and disconnect the appropriate door latch
  11. Test for less than 30 Ω between the control circuit terminal listed below and ground:
    • Control circuit terminal 2
    • Control circuit terminal 3
    • Control circuit terminal 5
    • Control circuit terminal 6
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the I/P fuse block.
  12. Ignition ON, connect a test lamp between the control circuit terminals:
    • Control circuit terminals 5 and 6
    • Control circuit terminals 2 and 3
  13. Command all doors to LOCK and UNLOCK by using the driver door lock switch. The test lamp should illuminate during the LOCK and UNLOCK command.
    • If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the I/P fuse block.
  14. If all circuits test normal, test or replace the door latch.
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