B252C

DTC B252C

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.

DTC Descriptor

DTC B252C 00
- Child Security Lock Switch Circuit

Diagnostic Fault Information






Circuit/System Description

The BCM monitors the voltage level in the child security door lockout switch signal circuit, when the switch is in the open position the voltage in the signal circuit will be equal to the B+ voltage level. When the child security door lockout switch is pressed, voltage within the signal circuit drops and the BCM will detect the voltage drop and will energize the Door Lock relay to disable the interior rear door handles.

Conditions for Running the DTC

The system voltage is 9-16 V.

Conditions for Setting the DTC

The BCM has detected a short to ground on the child security lockout switch signal circuit for greater than 60 seconds.

Action Taken When the DTC Sets

The BCM will ignore the input from the lockout switch and the child lockout feature will be inoperative.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left Front

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. Ignition ON.

2. 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 Power Door Child Lock Malfunction Power Door Child Lock Malfunction

• If the child lockout indicator turns ON and turns OFF

3. Verify the function of the child lockout indicator when commanding the child lockout ON and OFF with the child lockout switch.

• If the child lockout indicator is always ON
Refer to Power Door Child Lock Malfunction Power Door Child Lock Malfunction

• If the child lockout indicator flashes ON and OFF
Refer to Power Door Child Lock Malfunction Power Door Child Lock Malfunction

• If the child lockout indicator is always OFF
Refer to Circuit/System Testing

• If the child lockout indicator turns ON and turns OFF

4. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the A20 radio/HVAC controls. 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 17 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 11 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 A20 radio/HVAC controls.

Component Testing

1. Ignition OFF, disconnect the harness connector at the A20 radio/HVAC controls.

2. Test for infinite resistance between the signal terminal 11 and the ground terminal 17 with the switch in the open position.

• If less than infinite resistance
Replace the A20 radio/HVAC controls.

• If infinite resistance

3. Test for less than 2 ohms between the signal terminal 11 and the ground terminal 17 with the switch in the closed position.

• If 2 ohms or greater
Replace the A20 radio/HVAC controls.

• If less than 2 ohms

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for BCM and the radio/HVAC control replacement, setup and programming