Power Door Lock Key Cylinder Switches Inoperative

Power Door Lock Key Cylinder Switches Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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 key cylinder unlock feature will unlock or lock all of the doors when the body control module (BCM) receives a Key Unlock Switch or an Key Lock Switch signal for greater than 1 second and will unlock or lock all of the doors.

Circuit/System Verification

Ignition ON, insert the key into the drivers door lock cylinder, turn the key clockwise and hold for greater than 1 second and turn the key counterclockwise and hold for greater than 1 second while observing the scan tool Door Cylinder Switch parameter, the parameter should change from Idle to Lock and Unlock.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the driver door latch assembly.
2. Test for less than 5 ohms between the ground circuit terminal 8 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 Cylinder Switch parameter is Idle.

^ If not the specified parameter, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the BCM.

4. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and ground. Verify the scan tool Door Cylinder Switch parameter is Lock.

^ If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

5. If all circuits test normal, test or replace the driver door latch assembly.

Component Testing

1. Ignition OFF, disconnect the harness connector at the driver door latch assembly.
2. Test for infinite resistance between the signal terminal 9 and the ground terminal 8 with the switch in the open position.

^ If not the specified value, replace the driver door latch assembly.

3. Test for 450-550 ohms between the signal terminal 9 and the ground terminal 8 with the switch in the unlock position.

^ If not the specified range, replace the driver door latch assembly.

4. Test for less than 2.0 ohms between the signal terminal 9 and the ground terminal 8 with the switch in the lock position.

^ If greater than the specified range, replace the driver door latch assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Front Side Door Lock Replacement