B2485

DTC B2485

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 Instructionsprovide an overview of each diagnostic category.

DTC Descriptors
DTC B2485
- Wireless Communication Antenna Circuit (Bluetooth)

Circuit/System Description

The Bluetooth (R) antenna is a small fixed antenna connected directly to the communication interface module (CIM) and is used to send and receive signals from a Bluetooth (R) enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.

Conditions for Running the DTC

* Ignition ON.
* Battery voltage must be between 9-16 volts.
* The CIM tests the antenna once every second.

Conditions for Setting the DTC

The CIM detects a short to ground or an open/high resistance in the Bluetooth (R) antenna.

Actions Taken When the DTC Sets

* The OnStar (R) status LED turns red.
* Bluetooth (R) functionality is disabled.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Schematic Reference

OnStar Schematics OnStar Schematics
Connector End View Reference

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

OnStar Description and Operation OnStar
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 Relearningfor scan tool information

Circuit/System Testing

1. Verify the Bluetooth (R) antenna is properly connected to the CIM and is not damaged.

• If the antenna is disconnected or damaged, repair or replace as necessary.

2. Ignition ON, verify the DTC B2485 is not set.

• If the DTC is set, replace the Bluetooth (R) antenna. Clear the DTC and cycle the ignition OFF then back ON. If the DTC resets as current, replace the CIM.

Repair Instructions

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

* Wireless Communication Interface Antenna Replacement Service and Repair
* Control Module References Programming and Relearningfor CIM replacement, setup, and programming