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 Malfunction

Diagnostic Fault Information





Circuit/System Description

The central door lock switch operates the child locks on the rear doors. The lockout switch is an input to the body control module (BCM) and the BCM controls the child door lock and unlock circuits to the rear door latches. The rear door latches will disable or enable input from the inside door handles when voltage is applied to the appropriate circuit when the BCM senses a change in the child security door lock signal circuit.

Conditions for Running the DTC

The system voltage is 9-18 V.

Conditions for Setting the DTC

The DTC will set when the BCM detects a malfunction in the child security door lock switch signal circuit.

Action Taken When the DTC Sets

The rear interior door handles will be inoperative.

Conditions for Clearing the DTC

* This 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 (Connector Views)
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)

Circuit/System Verification

Enable and disable the interior rear door handles by pressing and depressing the child security lock switch, the interior rear door handles should be enabled and disabled while changing between the commanded states.

Component Testing

1. Ignition OFF, verify that all doors are unlocked by pressing the UNLOCK on the central door lock switch.
2. Disconnect the X1 harness connector at the A20 radio/HVAC control.
3. With the rear windows rolled down, open a rear door by using the interior rear door handle. The rear door should open when using the interior rear door handle.

• If the rear door will not open, test the signal circuit terminal 5 for a short to ground. If the circuit tests normal, replace the K9 BCM.

4. Install a 3 A fused jumper wire between the signal circuit terminal 5 and ground.
5. Verify that a rear door will not open by using the interior rear door handle.

• If the rear door opens, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 BCM.

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

Repair Instructions

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

Control Module References (Programming and Relearning) for BCM and radio/HVAC control replacement, setup and programming