All Doors Fail To Lock

ALL DOORS FAIL TO LOCK





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

Both the Door Lock Driver circuits (P392 and P393) are connected together inside the Cluster. Therefore either circuit shorted will affect all door locks. Depending on where the short is, one door may lock.






1. CHECK FOR DOOR LOCK DTC'S

NOTE: Ensure circuit breaker #1 in the PDC is in place and operational before proceeding.

1. Close both doors.
2. Turn the ignition on.
3. With the scan tool, record and erase DTCs.
4. Turn the ignition off, wait 10 seconds then turn the ignition on.
5. Try to operate the door locks several times.
6. With the scan tool, read active DTCs.

Does the scan tool display any Door Lock System DTCs?

No

- Go To 2

Yes

- Refer to the appropriate diagnostic procedure related to power door locks.

2. CHECK (P392) DOOR LOCK DRIVER RIGHT DOOR CIRCUIT FOR A SHORT TO GROUND

NOTE: If only one motor is inoperative when the door locks are actuated, disconnect that motor and retest to see if the other door locks properly. If they do, replace the defective motor.

NOTE: Ensure the door lock inhibit (key in ignition) and the door ajar systems are operating properly before proceeding. These systems affect the door lock locking functions if they are not working as they should.





1. Turn the ignition off.
2. Disconnect the Cluster C1 connector.
3. Measure the resistance between ground and the (P392) Door Lock Driver circuit.

Is the resistance below 1,000.0 ohms?

No

- Go To 3

Yes

- Repair the (P392) Door Lock Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST Body Verification Test.

3. CHECK (P393) DOOR LOCK DRIVER CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between ground and the (P393) Door Lock Driver circuit.

Is the resistance below 1,000.0 ohms?

No

- Replace the Cluster.
- Perform the BODY VERIFICATION TEST Body Verification Test.

Yes

- Repair the (P393) Door Lock Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST Body Verification Test.