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Power Door Locks Malfunction (Without Dead Locks)



Power Door Locks Malfunction (Without Dead Locks)

Diagnostic Instructions

- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information







Circuit/System Description

The body control module (BCM) monitors the voltage level of the door lock and door unlock signal circuits. When the central door lock switch is in the open position, the voltage level in the signal circuit will be near 0 V. When the central door lock switch is pressed to the lock or unlock position, a signal will be sent to the BCM requesting a lock or unlock command.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Locks Description and Operation

Electrical Information Reference

- Testing for Intermittent Conditions and Poor Connections
- Circuit Testing
- Wiring Repairs
- Connector Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, observe the scan tool BCM Central Door Lock Switch on Console parameter. The reading should be Inactive and change to Lock and Unlock when pushing the appropriate switch.
2. If the reading does not change, refer to Central Door Lock Switch Malfunction.
3. Command the doors to LOCK and UNLOCK by using the central door lock switch, the doors should LOCK and UNLOCK when changing between the commanded states.
4. If a door does not LOCK or UNLOCK, refer to Door Lock Malfunction.
5. If all doors do not LOCK or UNLOCK, refer to All Door Locks inoperative.

Circuit/System Testing

Central Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the A20 radio/HVAC control.
2. Ignition ON, verify the scan tool Central Door Lock Switch on Center Console parameter is Inactive.
3. If the value is Lock, test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the K9 BCM.
4. If the value is Unlock, test the signal circuit terminal 13 for a short to ground. If the circuit tests normal, replace the K9 BCM.
5. Install a 3 A fused jumper wire between the signal circuit terminal 12 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Lock.
6. 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 K9 BCM.
7. Install a 3 A fused jumper wire between the signal circuit terminal 13 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Unlock.
8. 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 K9 BCM.
9. If all circuits test normal, replace the A20 radio/HVAC control.

Door Lock Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
2. Connect a test lamp between control circuit terminals listed below:
- A23D door latch assembly-driver terminal 2 and terminal 3
- A23P door latch assembly-passenger terminal 7 and terminal 8
- A23LR door latch assembly-left rear terminal 7 and terminal 3
- A23RR door latch assembly-right rear terminal 9 and terminal 8

3. Ignition ON, command the door to LOCK and UNLOCK by using the central door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.
4. If the test lamp is always OFF for either the LOCK or UNLOCK command, test the control circuit for an open/high resistance between the connector and the circuit splice.
5. If all circuits test normal, test or replace the A23 door latch assembly.

All Door Locks Inoperative

1. Ignition OFF, disconnect the X2 harness connector at the A53 fuse block-rear.
2. Connect a test lamp between the control circuit terminal 35 and ground.
3. Ignition ON: use a scan tool to command that All Doors Lock. The test lamp should illuminate while commanding the LOCK state.
4. 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 K9 BCM.
5. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
6. Ignition OFF, connect the X2 harness connector and disconnect the X3 harness connector at the A53 fuse block-rear.
7. Connect a test lamp between the control circuit terminal 20 and ground.
8. Ignition ON: use a scan tool to command that All Doors Lock. The test lamp should illuminate while commanding the LOCK state.
9. 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 K9 BCM.
10. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
11. Ignition OFF, connect the X3 harness connector at the A53 fuse block-rear and disconnect the harness connector at the appropriate A23 door latch assembly.
12. Test for infinite resistance between the control circuit terminal listed below and ground:
- A23D door latch assembly-driver terminal 3
- A23P door latch assembly-passenger terminal 8
- A23LR door latch assembly-left rear terminal 3
- A23RR door latch assembly-right rear terminal 8

13. If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the A53 fuse block-rear.
14. Test for infinite resistance between the control circuit terminal listed below and ground:
- A23D door latch assembly-driver terminal 2
- A23P door latch assembly-passenger terminal 7
- A23LR door latch assembly-left rear terminal 7
- A23RR door latch assembly-right rear terminal 9

15. If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.
16. If all circuits test normal, test or replace the A23 door latch assembly.

Component Testing

Door Latch

1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
2. Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the A23 door latch assembly should perform the LOCK and UNLOCK functions.
3. If it does not perform as specified, replace the A23 door latch assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.
- Front Compartment Fuse Block Replacement
- Radio Control Assembly Replacement
- Front Side Door Lock Replacement
- Rear Side Door Lock Replacement
- Control Module References for BCM replacement, programming and setup.
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