B3125

DTC B3125

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach
* Diagnostic Procedure Instructions provides an overview of each diagnostic category

DTC Descriptor

DTC B3125 00
- Driver Door Only Unlock Circuit

Circuit/System Description

The body control module (BCM) energizes the driver door unlock relay coil through a low side drive control circuit. When the BCM receives an unlock message the driver door unlock relay control circuit is grounded energizing the driver door unlock relay coil.

Conditions for Running the DTC

* Battery voltage is between 9-16 volts.
* The BCM has attempted to energize the unlock relay.

Conditions for Setting the DTC

The driver door unlock relay control circuit is shorted to voltage.

Action Taken When the DTC Sets

The BCM will not attempt unlock operation.

Conditions for Clearing the DTC

* When the output request is not active the DTC will be a history status code.
* The history code will clear after 50 fault free ignition cycles or by using the scan tool clear DTCs feature.

Circuit/System Testing

1. Disconnect the BCM connector C7 and connect a test lamp from terminal 6 to ground.
2. Ignition ON, verify that the test lamp does not illuminate.

• If the test lamp illuminates test the control circuit for a short to voltage. If the circuit tests normal replace the IP fuse block.

3. If the circuits test normal replace the BCM.

Repair Instructions

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

* Instrument Panel Electrical Center or Junction Block Replacement - Left Side
* Control Module References for BCM replacement, programming, and setup. Programming and Relearning