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 front floor console controls the child locks on the rear doors. The lockout switch is an input to the body control module (BCM) and the BCM controls the Door Lock relay. When the BCM detects a voltage drop on the child door lockout signal circuit, 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 BCM will then provide a ground for the lockout indicator causing the indicator to 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
* Interior Lights Dimming Schematics Interior Lights Dimming Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Power Door Locks Description and Operation Description and Operation
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Circuit Testing Circuit Testing
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify the scan tool Child Security Lock Motors Command parameter changes between On and Off when pressing the child lockout switch.
• If the parameter does not change
Refer to Circuit/System Testing - Lockout Switch Inoperative.
• If the parameter changes
3. Verify the function of the child lockout indicator when commanding the Child Lockout Indicator ON and OFF with a scan tool.
• If the child lockout indicator is always ON or always OFF
Refer to Circuit/System Testing - Lockout Indicator Malfunction.
• If the child lockout indicator turns ON and turns OFF
4. Verify the operation of both interior rear door handles do not open the rear doors when commanding the Child Security Lock Motors ON with a scan tool.
• If both interior rear door handles open the rear doors
Refer to Circuit/System Testing - Security Lockout Inoperative.
• If a single interior rear door handle opens the rear door
Refer to Circuit/System Testing - Single Door Security Lockout Malfunction.
• If both interior door handles do not open the rear doors
5. Verify the operation of both interior rear door handles will open the rear doors when commanding the Child Security Lock Motors OFF with a scan tool.
• If both interior rear door handles do not open the rear doors
Refer to Circuit/System Testing - Security Lockout Inoperative.
• If a single interior rear door handle does not open the rear door
Refer to Circuit/System Testing - Single Door Security Lockout Malfunction.
• If both interior door handles open the rear doors
6. All OK.
Circuit/System Testing
Lockout Switch Inoperative
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48E multifunction switch-center console. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 9 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Test for greater than 10 V between the signal circuit terminal 7 and ground.
• If 10 V or less
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
5. Test or replace the S48E multifunction switch-center console.
Lockout Indicator Malfunction
1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S48E multifunction switch-center console.
2. Connect a test lamp between the control circuit terminal 8 and ground.
3. Ignition ON, verify the test lamp turns ON and OFF when commanding the LED Backlight Dimming ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If the test lamp turns ON and OFF
4. Connect a test lamp between the control circuit terminal 6 and B+. Ignition ON
5. Verify the test lamp turns ON and OFF when commanding the Child Lockout Indicator ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V
3. Ignition OFF.
4. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 body control module.
• If the test lamp turns ON and OFF
6. Test or replace the S48E multifunction switch-center console.
Security Lockout Inoperative
1. Ignition OFF, disconnect the X2 harness connector at the X50A fuse block-underhood.
2. Test for less than 10 ohms between the ground circuit terminal C5 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Connect a test lamp between the control circuit terminal D5 and ground, ignition ON.
4. Verify the test lamp turns ON and OFF when commanding the Child Security Lock Motors ON and OFF with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If the test lamp turns ON and OFF
5. Replace the X50A fuse block-underhood.
Single Door Security Lockout Malfunction
1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate rear A23 door latch assembly. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
* Ground terminal 3 - A23RR door latch assembly-right rear
* Ground terminal 8 - A23LR door latch assembly-left rear
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Test for greater than 10 V between the signal circuit terminal listed below and ground:
* Signal terminal 4 - A23RR door latch assembly-right rear
* Signal terminal 9 - A23LR door latch assembly-left rear
• If less than 10 V
1. Ignition OFF, disconnect the X6 harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the signal circuit end to end.
• If 2 ohms or greater, repair the open/high resistance on the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
5. Connect a test lamp between control circuit terminals listed below, ignition ON.
* Control circuit terminal 4 and control circuit terminal 7 - A23LR door latch assembly-left rear
* Control circuit terminal 2 and control circuit terminal 9 - A23RR door latch assembly-right rear
6. Verify the test lamp turns ON and OFF when commanding the child lockout ON and OFF by pressing the child lockout switch.
• If the test lamp remains OFF during either of the commands
1. Ignition OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between each control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K9 body control module.
• If the test lamp turns ON during each of the commands
7. Test or replace the rear A23 door latch assembly.
Component Testing
Child Security Lockout Switch Test
1. Ignition OFF, disconnect the harness connector at the S48E multifunction switch-center console.
2. Test for infinite resistance between the signal terminal 7 and the ground terminal 9 with the switch in the open position.
• If less than infinite resistance
Replace the S48E multifunction switch-center console.
• If infinite resistance
3. Test for less than 3ohms between the signal terminal 7 and the ground terminal 9 with the switch in the closed position.
• If 3 ohms or greater
Replace the S48E multifunction switch-center console.
• If less than 3 ohms
4. All OK
Door Latch Test
1. Ignition OFF, disconnect the harness connector at the appropriate rear A23 door latch assembly.
2. Install a 30 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 the function does not perform the LOCK and UNLOCK function
Replace the rear A23 door latch assembly.
• If the function performs the LOCK and UNLOCK function
3. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Rear Side Door Latch Replacement Service and Repair
* Front Floor Console Multifunction Switch Replacement Front Floor Console Multifunction Switch Replacement
* Front Compartment Fuse Block Replacement Service and Repair
* Control Module References Control Module References BCM replacement, programming and setup