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 Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
Door latch assemblies each contain a reversible dead lock motor, 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 security 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 Sunshade - Left (DH6)
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. 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 door dead lock to LOCK with a scan tool and attempt to open the door by using the interior door handles. The interior 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 door dead lock to UNLOCK with a scan tool and attempt to open the door by using the interior door handles. The interior 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 Door Dead 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 1 and control terminal 2 (Right Hand Drive)
* A23D door latch assembly - driver control terminal 6 and control terminal 7 (Left Hand Drive)
* A23P door latch assembly - passenger control terminal 6 and control terminal 7 (Right Hand Drive)
* A23P door latch assembly - passenger control terminal 1 and control terminal 2 (Left Hand Drive)
* A23LR door latch assembly - left rear control terminal 1 and control terminal 2
* A23RR door latch assembly - right rear control terminal 6 and control terminal 7
3. Command the door dead locks 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.
4. If all circuits test normal, test or replace the A23 door latch assembly.
All Door Dead Lock Malfunction
1. Ignition OFF, disconnect the X1 harness connector at the X50A fuse block-underhood.
2. Test for less than 10 ohms between the ground circuit terminal 71 and ground.
• If less than the specified range, test the ground circuit for an open/high resistance.
3. Connect the X1 harness connector at the X50A fuse block-underhood.
4. Disconnect the X7 harness connector at the K9 body control module.
5. Briefly connect a 3 A fused jumper wire between the control circuit terminal 10 and B+. Listen for the door lock PCB relay clicks.
• If the door lock PCB relay does not perform as specified, test the control circuit for an open/high resistance. If the circuit tests normal, replace the X50A fuse block - underhood.
• If the fuse within the jumper wire opens, test the control circuit for a short to ground. If the circuit tests normal, replace the X50A fuse block - underhood.
6. 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 A23 door latch assembly 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 Compartment Fuse Block Replacement Front Compartment Fuse Block Replacement
* 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 References for BCM replacement, programming and setup