Power Door Lock Key Cylinder Switches Malfunction

Power Door Lock Key Cylinder Switches Malfunction

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 driver window switch monitors the voltage level of the key switch unlock signal circuit. When the key is inserted into the driver door key cylinder and turned to the Unlock position, a switch within the driver door latch closes causing the voltage to drop within the key switch unlock signal circuit. The driver window switch will detect the drop in voltage and will send a serial data message to the BCM commanding all the doors to unlock.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Latch 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

Ignition OFF, insert the key into the drivers door lock cylinder, turn the key Unlock position while observing the scan tool Driver Door Key Cylinder Unlock Switch parameter, the parameter should change between Inactive and Active.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the driver door latch.
2. Test for less than 1 Ohms between the ground circuit terminal 8 and ground.
3. If greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify the scan tool Driver Door Key Cylinder Unlock Switch parameter is Inactive.
5. If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the driver door lock/window switch.
- Right hand drive terminal 4
- Left hand drive terminal 9

6. Fit a 3A fused jumper wire between the signal circuit terminal, as indicated below, and ground. Verify that the scan tool Driver Door Key Cylinder Unlock Switch parameter is Active.
- Right hand drive terminal 4
- Left hand drive terminal 9

7. 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 driver door lock/window switch.
8. If all circuits tests normal, test or replace the driver door latch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the driver door latch.
2. Test for infinite resistance between the terminals listed below with the switch in the open position.
- Right hand drive signal terminal 4 and ground terminal 8
- Left hand drive signal terminal 9 and ground terminal 8

3. If not the specified value, replace the driver door latch.
4. Test for less than 2 Ohms between the terminals listed below with the switch in the Unlock position.
- Right hand drive signal terminal 4 and ground terminal 8
- Left hand drive signal terminal 9 and ground terminal 8

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.
- Front Side Door Lock Replacement
- Front Side Door Window and Multifunction Switch Replacement