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DTC B252C

DTC B252C

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC B252C 00

Child Security Lock Switch Circuit

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Child Security Door Lockout Signal B252C 00 1 1 -
Radio/HVAC Control Ground - 1 - -
1. Child Security Lockout Malfunction


Circuit/System Description

The bod control module (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

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Locks Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, doors locked, command the child lockout function by pressing the child lockout switch, the interior rear door handles should become inoperative and the lockout indicator should illuminate.

Circuit/System Testing


1. Ignition OFF, disconnect the X1 harness connector at the A20 radio/HVAC control.

2. Ignition ON, test for greater than 10 V between the signal circuit terminal 5 and ground.

3. 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 BCM.

4. If all circuits test normal, test or replace the A20 radio/HVAC control.


Component Testing


Child Lockout Switch Test

1. Ignition OFF, disconnect the X1 harness connector at the A20 radio/HVAC control.

2. Test for infinite resistance between the signal terminal 5 and the ground terminal 17 with the switch in the open position.

3. If less than the specified value, replace the A20 radio/HVAC control.

4. Test for less than 2 Ω between the signal terminal 5 and the ground terminal 17 while holding the switch in the closed position.

5. If greater than the specified range, replace the A20 radio/HVAC control.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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