Power Door Locks Malfunction (Sedan/Wagon)
Power Door Locks Malfunction (Sedan/Wagon)
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 and front passenger power door lock switches are integral components of the driver door lock/window switch and passenger door lock/window switch. The switches consist of 2 positions, lock and unlock, and are in the normally open state. When placed in either the lock or unlock positions, the switches provide a direct input to their respective door lock/window switch. When a power door lock switch is operated to the lock or unlock position, the associated door lock/window switch responds by sending a serial data message indicating a change in the switch's position. This serial data message is received by the opposite door lock/window switch as well as the body control module (BCM). The driver door lock/window switch and passenger door lock/window switch responds to the lock/unlock request by enabling or disabling the driver and passenger exterior door handles. The BCM is responsible for controlling the left and right rear passenger door lock motors. The BCM, upon receipt of a lock or unlock serial data signal, will control either the rear door lock or unlock relay. When the appropriate door lock relay is energized, the rear power door lock motors will lock or unlock the rear doors.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
Power Door Latch 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. Observe the scan tool Driver Door Switch Ext. Driver Door Handle parameter while pulling and releasing the exterior driver door handle. The value should change from Inactive to Active each time the handle is pulled.
• If the value does not change, refer to Driver Exterior Door Handle Malfunction.
2. With the doors closed and unlocked, pull the exterior driver door handle. The driver door should unlatch allowing the driver door to be pulled open.
• If the driver door does not perform as specified, refer to Driver Door Latch Malfunction.
3. Observe the scan tool Passenger Door Switch Ext. Psgr. Door Handle parameter while pulling and releasing the exterior passenger door handle. The value should change from Inactive to Active each time the handle is pulled.
• If the value does not change, refer to Passenger Exterior Door Handle Malfunction.
4. With the doors closed and unlocked, pull the exterior passenger door handle. The passenger door should unlatch allowing the passenger door to be pulled open.
• If the passenger door does not perform as specified, refer to Passenger Door Latch Malfunction.
5. Command the rear door latches to LOCK and UNLOCK with a scan tool, the rear doors should LOCK and UNLOCK while changing between the commanded states.
• If either rear door does not LOCK or UNLOCK refer to Rear Door Lock Malfunction.
6. Observe the scan tool BCM Rear Doors Lock Cmd. and the Rear Doors Unlock Cmd. while pressing the driver or passenger door lock switch, each parameter should briefly change from Off to On to Off as the appropriate switch is pressed.
• If the value is always Off, replace the appropriate door lock/window switch
Circuit/System Testing
Driver Exterior Door Handle Malfunction
Note: Reconnect the X501 and X505 inline harness connectors located on the driver door panel prior to performing electrical diagnostics.
1. Ignition OFF, disconnect the harness connector at the driver door handle switch.
2. Test for less than 10 ohm between the ground circuit terminal listed below and ground:
* Ground terminal C
* Ground terminal F
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that the scan tool Driver Door Switch Ext. Driver Door Handle parameter is Inactive.
• 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.
* Signal terminal B
* Signal terminal E
4. Connect a 3A fused jumper wire between the signal circuit terminal listed below and ground, verify that the scan tool Driver Door Switch Ext. Driver Door Handle parameter is Active.
* Signal terminal B
* Signal terminal E
• 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.
5. If all circuits test normal, test or replace the driver door handle switch.
Driver Door Latch Malfunction
Note: Reconnect the X501 and X505 inline harness connectors located on the driver door panel prior to performing electrical diagnostics.
1. Ignition OFF, the harness connector at the driver door latch.
2. Connect a test lamp between the control circuit terminal listed below and ground :
* Left hand drive-control circuit terminal 3
* Right hand drive-control circuit terminal 8
3. Observe the function of the test lamp while pulling and releasing the exterior driver door handle. The test lamp will briefly illuminate each time the handle is pulled.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the driver door lock/window switch.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the driver door lock/window switch.
4. Connect a test lamp between the control circuit terminal listed below and B+:
* Control terminal 2 (left hand drive -UA2)
* Control terminal 4 (left hand drive +UA2)
* Control terminal 9 (right hand drive)
5. Observe the function of the test lamp while pulling and releasing the exterior driver door handle. The test lamp will briefly illuminate each time the handle is pulled.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the driver door lock/window switch.
6. If all circuits test normal, replace the driver door latch.
Passenger Exterior Door Handle Malfunction
Note: Reconnect the X600 and X601 inline harness connectors located on the passenger door panel prior to performing electrical diagnostics.
1. Ignition OFF, disconnect the harness connector at the passenger door handle switch.
2. Test for less than 10 ohm between the ground circuit terminal listed below and ground:
* Ground terminal C
* Ground terminal F
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that the scan tool Passenger Door Switch Ext. Psgr. Door Handle parameter is Inactive.
• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the passenger door lock/window switch.
* Signal terminal B
* Signal terminal E
4. Connect a 3A fused jumper wire between the signal circuit terminal listed below and ground, verify that the scan tool Passenger Door Switch Ext. Psgr. Door Handle parameter is Active.
* Signal terminal B
* Signal terminal E
• 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 passenger door lock/window switch.
5. If all circuits test normal, test or replace the passenger door handle switch.
Passenger Door Latch Malfunction
Note: Reconnect the X600 and X601 inline harness connectors located on the passenger door panel prior to performing electrical diagnostics.
1. Ignition OFF, the harness connector at the passenger door latch.
2. Connect a test lamp between the control circuit terminal listed below and ground :
* Control terminal 6 (left hand drive -UA2)
* Control terminal 8 (left hand drive +UA2)
* Control terminal 3 (right hand drive)
3. Observe the function of the test lamp while pulling and releasing the exterior passenger door handle. The test lamp will briefly illuminate each time the handle is pulled.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the passenger door lock/window switch.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the passenger door lock/window switch.
4. Connect a test lamp between the control circuit terminal listed below and B+:
* Control terminal 5 (left hand drive -UA2)
* Control terminal 9 (left hand drive +UA2)
* Control terminal 4 (right hand drive)
5. Observe the function of the test lamp while pulling and releasing the exterior passenger door handle. The test lamp will briefly illuminate each time the handle is pulled.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the passenger door lock/window switch.
6. If all circuits test normal, replace the passenger door latch.
Rear Door Lock Malfunction
1. Ignition OFF, disconnect the UNLCK relay.
2. Test for less than 30 ohm between the ground circuit terminal 87A and ground.
• If greater than the specified range, test the ground circuit for a short to voltage or an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal listed below and ground:
* B+ circuit terminal 86
* B+ circuit terminal 87
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
5. Command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
6. Ignition OFF, connect the UNLCK relay and disconnect the LCK relay.
7. Test for less than 30 ohms between the ground circuit terminals listed below and ground:
* Ground circuit terminal 86
* Ground circuit terminal 87A
• If greater than the specified range, test the ground circuit for a short to voltage or an open/high resistance.
8. Connect a test lamp between the ground circuit terminal 86 and the control circuit terminal 85.
9. Command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
10. Ignition OFF, connect the LCK relay and disconnect the harness connector at the appropriate A23 door latch-rear.
Note: Reconnect the appropriate inline harness connector located on the rear door panel prior to performing electrical diagnostics.
11. Test for less than 10 ohm between the control circuit terminal listed below and ground.
* A23LR door latch-left rear control circuit terminal 2
* A23RR door latch-right rear control circuit terminal 5
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the UNLCK relay.
12. Test for less than 10 ohm between the control circuit terminal listed below and ground.
* A23LR door latch-left rear control circuit terminal 3
* A23RR door latch-right rear control circuit terminal 6
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the LCK relay.
13. Connect a test lamp between the control circuit terminal listed below and ground.
* A23LR door latch-left rear control circuit terminal 2
* A23RR door latch-right rear control circuit terminal 5
14. Command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the UNLCK relay.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the UNLCK relay.
15. Connect a test lamp between the control circuit terminal listed below and ground.
* A23LR door latch-left rear control circuit terminal 3
* A23RR door latch-right rear control circuit terminal 6
16. Command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the LCK relay.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the LCK relay.
17. If all circuits test normal, test or replace the A23 door latch assembly-rear.
Component Testing
Rear Door Latch Assembly Test
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly-rear.
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 A23 door latch assembly-rear should perform the LOCK and UNLOCK functions.
• If it does not perform as specified, replace the A23 door latch assembly-rear.
Relay Test
1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohm between terminals 85 and 86.
• If not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If less than the specified value, replace the relay.
4. Test for less than 2 ohm between terminals 30 and 87 A.
• If greater than the specified value, replace the relay.
5. Install a 3 A fused jumper wire between terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohm between terminals 30 and 87.
• If greater than the specified value, replace the relay
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Front Side Door Outside Handle Replacement (Without ATH) Front Side Door Outside Handle Replacement (Without ATH)Front Side Door Outside Handle Replacement (Front Door with ATH) Front Side Door Outside Handle Replacement (Front Door with ATH)Front Side Door Outside Handle Replacement (Front and Rear Doors with ATH) Front Side Door Outside Handle Replacement (Front and Rear Doors with ATH)
* Front Side Door Latch Replacement (Sedan/Wagon) Front Side Door Latch Replacement (Sedan/Wagon)Front Side Door Latch Replacement (Coupe) Front Side Door Latch Replacement (Coupe)
* Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)
* Rear Side Door Latch Replacement Service and Repair
* Control Module References Control Module References for door lock/window switch-driver, door lock/window switch passenger and BCM, replacement, setup and programming