All Doors Fail to Lock

ALL DOORS FAIL TO LOCK

All Doors Fail To Lock:

Theory of Operation
The Door Lock Driver Right Doors circuit and the Door Lock Driver Left Doors circuits are connected together inside the Cluster. Therefore either circuit shorted will affect all door locks. Depending on where the short is, some doors may lock.

POSSIBLE CAUSES
- (P392) Door lock driver right doors circuit short to ground
- (P393) Door lock driver left doors circuit short to ground
- Cluster

Diagnostic Test

1. CHECK FOR DOOR LOCK DTC'S
Turn the ignition on.
With the scan tool, record and erase DTC's.
Turn the ignition off, wait 10 seconds then turn the ignition on.
Try to operate the door locks several times.
With the scan tool, read active DTC's.

Q: Does the scan tool display any Door Lock System DTC's?

NO: Go To 2
YES: Refer to symptom list for problems related to POWER DOOR LOCKS.

2. CHECK (P392) DOOR LOCK DRIVER RIGHT DOORS 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 doors lock properly. If they do, replace the defective motor.
- 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.

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

Q: Is the resistance below 1000.0 ohms?

NO: Go To 3
YES: Repair the (P392) Door Lock Driver Right Doors circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

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




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

Q: Is the resistance below 1000.0 ohms?

NO: Replace the Cluster.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
YES: Repair the (P393) Door Lock Driver Left Doors circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test