Power Door Child Lock Malfunction
Power Door Child 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
The child door lockout switch is on the driver door lock/window switch and controls the child locks on the rear doors as well as the rear window switches. When the BCM receives a command from the window lockout switch, it will apply voltage to the door lock security relay coil, this will energize the relay and the contact within the relay will then direct the voltage to lock the left rear and right rear child locks and then isolate them from the normal door lock system to prevent the rear doors from being opened by using the interior rear door handles.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
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. Command the doors to LOCK and UNLOCK with the scan tool, both rear doors should LOCK and UNLOCK while changing between the commanded states.
• If either rear door does not LOCK or UNLOCK, refer to Power Door Locks Malfunction Power Door Locks Malfunction.
2. With all the doors locked, command the child security lockout by pressing the window lockout switch on the driver door lock/window switch, the interior rear door handles should not open the doors when used.
• If both interior rear door handles continue to function, refer to Both Child Security Door Lockouts Inoperative.
• If the left or right interior rear door handles continue to function, refer to Single Child Security Door Lockout Inoperative.
Circuit/System Testing
Both Child Security Door Lockouts Inoperative
1. Ignition OFF, disconnect the X1 harness connector at the X50A fuse block-underhood.
2. Test for less than 10 ohm between the ground circuit terminal 71 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition OFF, connect the X1 harness connector and disconnect the X2 harness connector at the X50A fuse block-underhood
4. Connect a test lamp between the control circuit terminal 13 and ground.
5. Ignition ON, command the child security lockout ON and OFF by pressing and depressing the window lockout switch on the S79D driver door lock/window switch. The test lamp should turn ON and OFF 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 body control module.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
6. If all circuits test normal, replace the X50A fuse block-underhood.
Single Child Security Door Lockout Inoperative
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch assembly-rear.
2. Test for less than 10 ohm between the ground circuit terminal listed below and ground:
* A23LR door latch assembly-left rear terminal 8
* A23RR door latch assembly-right rear terminal 3
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Test for greater than 10V between the signal circuit terminal listed below and ground:
* A23LR door latch assembly-left rear terminal 9
* A23RR door latch assembly-right rear terminal 4
• If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
4. Connect a test lamp between the control circuit terminals listed below:
* A23LR door latch assembly-left rear terminal 7 and terminal 4
* A23RR door latch assembly-right rear terminal 2 and terminal 9
5. Command the child security lockout by pressing the window lockout switch on the S79D driver door lock/window switch, the test lamp should briefly illuminate during the lockout command.
• If the test lamp is always OFF, test either control circuit for an open/high resistance.
6. If all circuits test normal, test or replace the A23 door latch assembly-rear.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate rear 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 rear A23 door latch assembly should perform the LOCK and UNLOCK functions.
• If it does not perform as specified, replace the rear A23 door latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Rear Side Door Latch Replacement Service and Repair
* Fuse Block Replacement Fuse Block Replacement
* Front Side Door Window and Multifunction Switch Replacement Front Side Door Window and Multifunction Switch Replacement
* Control Module References Control Module References for BCM replacement, programming and setup