Volt

Power Door Child Lock Malfunction

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 energise 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.

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Locks Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Vehicle in Service Mode, observe the scan tool Window Lockout Switch parameter while pressing the window lockout switch on the S79D window switch-driver. 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 S79D window switch-driver.

2. 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 Locks Malfunction .

3. With all the doors locked, command the child security lockout by pressing the window lockout switch on the S79D window switch-driver, 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.

Child Security Door Lockout Inoperative

1. Vehicle OFF, disconnect the X3 harness connector at the X50A fuse block-under-bonnet.
2. Test for less than 10 Ω between the ground circuit terminal 48 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Vehicle OFF, connect the X3 harness connector and disconnect the X1 harness connector at the X50A fuse block-under-bonnet
4. Connect a test lamp between the control circuit terminal 36 and ground.
5. Vehicle in Service Mode, command the child security lockout by pressing the window lockout switch on the S79D window switch-driver. 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.

6. If all circuits test normal, replace the X50A fuse block-under-bonnet.

Child Security Door Lockout Malfunction

1. Vehicle OFF, disconnect the harness connector at the appropriate A23 door latch assembly-rear.
2. Test for less than 10 Ω 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. Vehicle in Service Mode, 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 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 window switch-driver, 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 A23 door latch assembly-rear.

1. Vehicle OFF, disconnect the harness connector at the appropriate A23 door latch assembly-rear.
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-rear should perform the LOCK and UNLOCK functions.

⇒	If it does not perform as specified, replace the A23 door latch assembly-rear.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.