Power Door Locks Malfunction
Power Door Locks 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 body control module (BCM) powers the reversible door latch assemblies by providing battery positive voltage and ground to the appropriate lock and unlock control circuits of the door latch assemblies. The lock and unlock control circuits of the rear doors and passenger door latch assemblies are all connected together. When the door latch assemblies are not active, all actuator lock and unlock control circuits are at ground potential within the BCM. Transitioning of the lock actuators to the lock or unlocked position depends upon which control circuits receive voltage and which control circuits receive ground.
Diagnostic Aids
Verify the smooth and consistent mechanical operation of each part of the door latch system prior to performing extensive electrical diagnostics
Any door that does not function smoothly or consistently, refer to Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function.
Reference Information
Schematic Reference
* Door Lock/Indicator Schematics Door Lock/Indicator Schematics
* Body Control System Schematics [1][2]Body Control Systems
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool BCM Central Door Lock Switch on Console parameter. The reading should be Inactive and change to Lock and Unlock when pushing the appropriate switch on the door lock switch-driver.
• If the value does not change between commanded states, refer to Central Door Lock Switch Malfunction.
2. Verify the function of the driver and passenger door lock knobs by manually moving the door locks knobs between the LOCK and UNLOCK positions, all door lock knobs should move between the LOCK and UNLOCK positions without binding or require excessive force.
• If the driver or passenger door lock knob does not function or requires excessive force, refer to Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function Door Will Not Open/Close, Door Binding, or Locks, Handles, or Cylinders Do Not Function.
3. Command the doors to LOCK and UNLOCK with a scan tool, all doors should LOCK and UNLOCK while changing between the commanded states.
• If the driver door does not LOCK or UNLOCK, refer to Driver Door Lock Malfunction.
• If one or more but not all passenger doors do not LOCK or UNLOCK, refer to Passenger Door Lock Malfunction.
• If all doors do not LOCK and UNLOCK, refer to All Door Locks Inoperative.
Circuit/System Testing
Central Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the S13D door lock switch-driver.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Central Door Lock Switch on Center Console parameter is Inactive.
• If the value is Lock , test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 body control module.
• If the value is Unlock , test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K9 body control module.
4. Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Lock.
• 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 K9 body control module.
5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground. Verify the scan tool Central Door Lock Switch on Center Console parameter is Unlock.
• 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 K9 body control module.
6. If all circuits test normal, replace the S13D door lock switch-driver.
Driver Door Lock Malfunction
1. Ignition OFF, verify the harness connector for the A23D door latch assembly-driver is firmly seated and secure.
• If not the specified condition, seat and secure the harness connector and perform the Circuit/System Verification.
2. If the harness connector for the door latch is firmly seated and secure, refer to Driver Door Lock Circuit Testing.
Driver Door Lock Circuit Testing
1. Ignition OFF, disconnect the harness connector at the A23D door latch assembly-driver.
2. Connect a test lamp between the control circuit terminal 2 and the control circuit terminal 3
3. Command the driver door latch to LOCK and UNLOCK with a scan tool, the test lamp should illuminate when commanding the LOCK and UNLOCK states.
• If the test lamp is OFF during either of the LOCK and UNLOCK commands, test either control circuit for an open/high resistance. If the circuits test normal, replace the K9 body control module.
• If the test lamp always ON , test either control circuit for a short to voltage. If the circuits test normal, replace the K9 body control module.
4. If all circuits test normal, test or replace the A23D door latch assembly-driver
Passenger Door Lock Malfunction
1. Ignition OFF, verify the appropriate harness connector for the A23 door latch assembly is firmly seated and secure.
• If not the specified condition, seat and secure the harness connector and perform the Circuit/System Verification.
2. If the harness connector for the door latch is firmly seated and secure, refer to Passenger Door Lock Circuit Testing.
Passenger Door Lock Circuit Testing
1. Ignition OFF, disconnect the harness connector at the appropriate passenger or rear A23 door latch assembly.
2. Connect a test lamp between the control circuit terminals listed below:
* A23P door latch assembly-passenger control circuit terminal 7 and control circuit terminal 8
* A23RR door latch assembly-right rear control circuit terminal 7 and control circuit terminal 8
* A23LR door latch assembly-left rear control circuit terminal 2 and control circuit terminal 3
3. Command the door to LOCK and UNLOCK with a scan tool, the test lamp should illuminate when commanding the LOCK and UNLOCK states.
• If the test lamp is OFF during either of the LOCK and UNLOCK commands, test either control circuit for an open/high resistance. If the circuits test normal, replace the K9 body control module.
• If the test lamp always ON , test either control circuit for a short to voltage. If the circuits test normal, replace the K9 body control module.
4. If all circuits test normal, test or replace the A23 door latch assembly
All Door Locks Inoperative
1. Ignition OFF, disconnect the X2 harness connector at the K9 body control module.
2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
3. Ignition OFF, connect the X2 harness connector and disconnect the X6 harness connector at the K9 body control module.
4. Test for infinite resistance between each control circuit listed below and ground:
* Control circuit terminal 1
* Control circuit terminal 2
* Control circuit terminal 4
• If not the specified value, disconnect the A23 door latch assemblies and test each control circuit for a short to ground. If the circuits test normal, test for a shorted A23 door latch assembly.
5. If all circuits test normal, replace the K9 body control module.
Component Testing
Door Latch
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
2. Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the door latch should perform the LOCK and UNLOCK functions.
• If it does not perform as specified, replace the A23 door latch assembly.
Central Door Lock Switch
1. Ignition OFF, disconnect the harness connector at the S13D door lock switch-driver.
2. Test for infinite resistance between the signal terminal 3 and the ground terminal 1 with the switch in the open position.
• If not the specified value, replace the S13D door lock switch-driver.
3. Test for infinite resistance between the signal terminal 4 and the ground terminal 1 with the switch in the open position.
• If not the specified value, replace the S13D door lock switch-driver.
4. Test for less than 2 ohms between the signal terminal 4 and the ground terminal 1 with the switch in the lock position.
• If greater than the specified range, replace the S13D door lock switch-driver.
5. Test for less than 2 ohms between the signal terminal 3 and the ground terminal 1 with the switch in the unlock position.
• If greater than the specified range, replace the S13D door lock switch-driver.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Door Lock Switch Replacement Service and Repair
* Front Side Door Latch Replacement Service and Repair
* Rear Side Door Latch Replacement Service and Repair
* Control Module References Control Module References for BCM replacement, programming and setup