B3031

DTC B3031 (US, Caribbean, C America, and Mexico)

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 B3031
- Security System Controller In Learn Mode

Circuit/System Description

When learning the voltage value delivered from the security resistor, the body control module (BCM) is placed in learn mode. DTC B3031 will set automatically as an indicator that the system is in learn mode and not as a fault indicator. Once the coded key is learned, learn mode will be exited and the DTC cleared. If the BCM does not exit learn mode, B3031 will remain current and indicate a fault.

Conditions for Running the DTC

The BCM is in the Learn Passlock state.

Conditions for Setting the DTC

The DTC will set any time the BCM is in the Learn Passlock state.

Action Taken When the DTC Sets

* Vehicle starting will be disabled.
* The security indicator is illuminated.

Conditions for Clearing the DTC

A current DTC will be cleared upon the successful exit of learn mode.

Reference Information
Schematic Reference

Immobilizer Schematics (Immobilizer Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Immobilizer Description and Operation (US, Caribbean, C America, and Mexico) (Immobilizer Description and Operation (US, Caribbean, C America, and Mexico))
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

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

Circuit/System Testing

1. Verify DTCs B2957, B2958, or B3060 are not set as current.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).

2. Verify the scan tool BCM Passlock State parameter displays Learn Passlock.

• If not the specified value, perform the 10 Minute Security Resistor Relearn procedure.

3. Perform the 10 Minute Vehicle Key Relearn procedure. The BCM should exit the Learn Passlock state and DTC B3031 should clear.

• If the TDM does not exit the learn coded key state after the programming attempt, replace the BCM.

Repair Instructions

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

Control Module References (Programming and Relearning) for BCM replacement, setup, and programming