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 on the driver window switch controls lockout functions rear window switches and the rear interior door handles. The lockout switch is an input to the body control module (BCM) and the BCM controls the Door Lock relay. When the BCM receives a command from the child door lockout switch, it will apply voltage to the Door Lock 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. The lockout indicator will illuminate to notify the driver that the child door lockout system has been activated. If the BCM detects a fault in the child door lockout system, it will command the lockout indicator to flash ON and OFF for 30 seconds.
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 Programming and Relearning for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Window Lockout Switch parameter while pressing the window lockout switch on the driver window switch. The value should change from Inactive to Active each time the switch is pressed.
• If the value is always Inactive or always Active, replace the driver door lock/window switch.
2. Observe the function of the lockout indicator while pressing the window lockout switch on the driver window switch. The indicator should turn ON and OFF each time the switch is pressed
• If the indicator is always ON or always OFF, replace the driver window switch.
• If the indicator flashes ON and OFF, refer to Child Security Door Lockout Inoperative or the Child Security Door Lockout Malfunction.
3. Command the doors to LOCK and UNLOCK with the scan tool, all doors should LOCK and UNLOCK while changing between the commanded states.
• If either rear door does not LOCK or UNLOCK, refer to Power Door Lock Malfunction - DTC B3125, B3130, or B3135 B3125.
4. With all the doors locked, command the child security lockout by pressing the window lockout switch on the driver 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 Child Security Door Lockout Inoperative.
• If the left or right interior rear door handles continue to function, refer to Child Security Door Lockout Malfunction.
Circuit/System Testing
Child Security Door Lockout Inoperative
1. Ignition OFF, disconnect the KR113 rear door handle disable relay.
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. Connect a test lamp between the control circuit terminal 3 and ground.
4. Ignition ON, command the child security lockout by pressing the window lockout switch on the S79D driver 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 BCM.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
5. If all circuits test normal, test or replace the KR113 rear door handle disable relay.
Child Security Door Lockout Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate rear A23 door latch assembly.
2. Test for less than 10 ohms 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 10 V 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 BCM.
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 window switch, the test lamp should briefly illuminate while changing between the commanded states.
• If the test lamp is always OFF, test either control circuit for an open/high resistance between the connector and the circuit splice.
6. If all circuits test normal, test or replace the rear A23 door latch assembly.
Component Testing
Door Latch Test
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.
Relay Test
1. Ignition OFF, disconnect the KR113 rear door handle disable relay.
2. Test for 60-180 ohms between terminals 1 and 2.
• If the not within the specified range, replace the KR113 rear door handle disable relay.
3. Test for infinite resistance between the following terminals:
* 3 and 2
* 3 and 5
* 3 and 1
* 1 and 5
• If not the specified value, replace the KR113 rear door handle disable relay.
4. Install a 5 A fused jumper wire between relay terminal 2 and 12 V. Install a jumper wire between relay terminal 1 and ground. Test for less than 2 ohms between terminals 3 and 5.
• If greater than the specified range, replace the KR113 rear door handle disable relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Rear Side Door Lock Replacement Rear Side Door Lock Replacement
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Front Side Door Window Switch Replacement Front Side Door Window Switch Replacement
* Control Module References Programming and Relearning for BCM replacement, programming and setup