Power Door Lock Key Cylinder Switches Malfunction
Power Door Lock Key Cylinder Switches Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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 Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Circuit Testing Circuit Testing
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
Vehicle OFF, insert the key into the drivers door lock cylinder, turn the key Unlock position while observing the scan tool BCM Driver Door Key Unlock Switch parameter, the parameter should change between Inactive and Active.
Circuit/System Testing
1. Vehicle OFF, disconnect the harness connector at the A23D door latch assembly-driver.
2. Test for less than 1 ohm between the ground circuit terminal 8 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Vehicle in Service Mode, verify the scan tool Driver Door Key Unlock Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the S79D window switch-driver.
4. Install a 3 A fused jumper wire between the signal circuit terminal 9 and ground, verify the scan tool Driver Door Key Unlock Switch parameter is Active.
• 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 S79D window switch-driver.
5. If all circuits tests normal, test or replace the A23D door latch assembly-driver.
Component Testing
1. Vehicle OFF, disconnect the harness connector at the A23D door latch assembly-driver.
2. Test for infinite resistance between terminal 8 and terminal 9 with the switch in the open position.
• If not the specified value, replace the A23D door latch assembly-driver.
3. Test for less than 2 ohm between terminal 8 and terminal 9 with the switch in the Unlock position.
• If greater than the specified range, replace the A23D door latch assembly-driver.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Side Door Lock Replacement Front Side Door Lock Replacement
* Front Side Door Window and Multifunction Switch Replacement Front Side Door Window and Multifunction Switch Replacement