B252B

DTC B252A or B252B

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 Descriptors
DTC B252A 01
- Driver Door Unlatch Enable Circuit Short to Battery

DTC B252B 01
- Passenger Door Unlatch Enable Circuit Short to Battery

Diagnostic Fault Information





Circuit/System Description

The keyless entry control module will detect the approach of the keyless entry transmitter and when an exterior door handle is pulled, the keyless entry control module will send a serial data message to the body control module (BCM) to unlock the doors and the keyless entry control module will then unlatch the door allowing the door to be pulled open.

Conditions for Running the DTC

The system voltage is 9-16 V.

Conditions for Setting the DTC

B252A 02

The keyless entry control module detects a short to voltage on the driver door unlatch signal circuit.

B252B 02

The keyless entry control module detects a short to voltage on the passenger door unlatch signal circuit.

Action Taken When the DTC Sets

The driver, passenger, left rear or right rear doors will require two pulls of their exterior door handles to unlock the door and to unlatch the door.

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)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Doors locked, approach the vehicle with the keyless entry transmitter and lift the exterior driver door handle. The driver door should unlock and unlatch allowing the driver door to be pulled open.

• If the driver door will not unlock and unlatch with a single pull of the driver door handle, refer to Driver Door Release Command Malfunction.

2. Doors locked, approach the vehicle with the keyless entry transmitter and lift the exterior passenger door handle. The passenger door should unlock and unlatch allowing the passenger door to be pulled open.

• If the passenger door will not unlock and unlatch with a single pull of the door handle, refer to Passenger and Rear Door Release Command Malfunction.

Circuit/System Testing

Driver Door Release Command Malfunction
1. Ignition OFF, disconnect the X4 harness connector at the K84 keyless entry control module.
2. Verify that a test lamp does not illuminate between the signal circuit terminal 3 and ground.

• If the test lamp is ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

3. If all circuits test normal, replace the K84 keyless entry control module.

Passenger and Rear Door Release Command Malfunction
1. Ignition OFF, disconnect the X4 harness connector at the K84 keyless entry control module.
2. Verify that a test lamp does not illuminate between the signal circuit terminal 14 and ground.

• If the test lamp is ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

3. If all circuits test normal, replace the K84 keyless entry control module.

Repair Instructions

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

Control Module References (Programming and Relearning)for BCM or keyless entry control module replacement, setup and programming