Power Door Dead Lock Malfunction
Power Door Dead Lock 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 Instructionsprovides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Vehicles equipped with the AF8 option contain a reversible dead lock motor contained within each door latch assembly. Each dead lock motor is controlled by 2 circuits; the dead lock control circuit and the dead lock unlock control circuit. To dead lock a door, the body control module (BCM) locks the door by momentarily energizing the door lock relay. To complete the dead locking, the BCM momentarily applies voltage to the dead lock control circuit and ground to the door lock relay control circuit and the door latches will then dead lock.
To undead lock the door, the BCM uses the same circuit as the normal door unlocking system and the dead locks will unlatch with the rest of the door locks.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
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 Referencesfor scan tool information
Circuit/System Verification
1. Operate the door locks to LOCK and UNLOCK by pressing the appropriate central door lock switch, each interior door lock knob should move between LOCK and UNLOCK.
• If one or more doors do not LOCK or UNLOCK, refer to Power Door Lock Malfunction - DTC B3125, B3130, or B3135 B3125
2. Command the doors to LOCK with a scan tool and manually unlock each door, attempt to open the door by using the exterior door handles. The exterior door handles should be inoperative.
• If one or more doors open but not all, refer to Single Door Dead Lock Malfunction.
• If all doors open, refer to All Door Dead Lock Malfunction.
3. Command the doors to UNLOCK with a scan tool and attempt to open the door by using the exterior door handles. The exterior door handles should open the doors.
• If one or more doors open but not all, refer to Single Door Dead Lock Malfunction.
• If all doors do not open, refer to All Door Dead Lock Malfunction.
Circuit/System Testing
Single Rear Door Lock Malfunction
Note: The dead lock diagnostic assumes the door latches function normally
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly.
2. Connect a test lamp between control circuit terminals listed below:
* A23D door latch assembly - driver control terminal 6 and control terminal 2 (Right hand drive)
* A23D door latch assembly - driver control terminal 1 and control terminal 2 (Left hand drive)
* A23P door latch assembly - passenger control terminal 1 and control terminal 7 (Right hand drive)
* A23P door latch assembly - passenger control terminal 6 and control terminal 7 (Left hand drive)
* A23LR door latch assembly - left rear control terminal 1 and control terminal 9
* A23RR door latch assembly - right rear control terminal 6 and control terminal 9
3. Command the doors to LOCK and UNLOCK with a scan tool, the test lamp should briefly illuminate while commanding the LOCK and UNLOCK states.
• If the test lamp is always OFF, test either control circuit for an open/high resistance between the connector and the circuit splice.
4. If all circuits test normal, test or replace the A23 door latch assembly.
All Door Dead Lock Malfunction
Note: The dead lock diagnostic assumes the door latches function normally
1. Ignition OFF, disconnect the X2 harness connector at the X53A fuse block-rear body.
2. Test for less than 10 ohm between the ground circuit terminal 27 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal 32 and the ground circuit terminal 27.
4. Ignition ON, command the door dead locks to LOCK and UNLOCK with a scan tool, the test lamp should briefly illuminate when changing between the commanded states.
• 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.
5. Ignition OFF, disconnect the X3 harness connector at the X53A fuse block-rear body.
6. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 17 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
7. Test for infinite resistance between the control circuit terminal 17 and ground.
• If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, test for a shorted A23 door latch assembly.
8. If all circuits test normal, replace the X53A fuse block-rear body.
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 volts. 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.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Side Door Lock Replacement Front Side Door Lock Replacement
* Rear Side Door Lock Replacement Rear Side Door Lock Replacement
* Control Module References Control Module Referencesfor BCM replacement, programming and setup