B3976

DTC B3976

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 and overview of each diagnostic category.

DTC Descriptor

DTC B3976 46

- Unconfigured Transponder/Vehicle Configuration Not Programmed

Circuit/System Description

When the theft deterrent module (TDM) is in the learn coded key or learn more keys mode, the TDM checks the vehicle key to ensure it has been configured as a master key.

Conditions for Running the DTC

* Ignition is in the Accessory or Run position.
* The TDM is in the learn coded key or learn more keys mode.

Conditions for Setting the DTC

The TDM has determined the vehicle key is not configured as a master key.

Action Taken When the DTC Sets

The security indicator will be illuminated.

Conditions for Clearing the DTC

* A current DTC will be cleared when the TDM detects a master configured vehicle key.
* A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.

Circuit/System Verification

Important: When using this diagnostic, more than one vehicle key is required to ensure proper diagnosis. If more than one key is not available at the time of service, contact the customer and ask if any other keys can be provided for service. If unavailable, a new second key can be created.

1. Verify that DTC B3055 or DTC B3060 is not set as a current DTC.

• If DTC B3055 or DTC B3060 is set, proceed with those diagnostic prior to performing the diagnostics for DTC B3967. Refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions

2. While viewing DTCs with a scan tool, attempt to start the vehicle using all of the available keys. The vehicle should start with all available keys.

• If only one key results in inoperative starting and DTC B3976 is set as current, replace the suspect key.
• If all available keys result in inoperative starting and DTC B3976 is set as current, replace the TDM.

Repair Instructions

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

Important: Because of how vehicle key information and theft deterrent passwords are stored within the TDM, the Set Up a New Theft Deterrent Module procedure must be performed prior to the removal and replacement of the TDM if the vehicle keys are being reused. Performing the setup procedure first allows the scan tool to extract the key information and passwords from the old TDM prior to its removal. Failure to perform this step will result in the failure to learn the existing vehicle keys and new vehicle keys will be required when replacing the TDM.

If the existing vehicle keys are not being reused, the TDM is to be replaced prior to performing of the setup procedure.

* Replacing Keys for replacing vehicle keys or adding keys when a learned master key is not available.
* Adding Keys for adding vehicle keys when a learned master key is available.
* Control Module References for TDM replacement, setup, and programming.