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Bluetooth Malfunction

Bluetooth Malfunction

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


Circuit/System Description

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

In order to use hands-free calling, the cellular phone must be paired to the vehicle. Up to five devices can be paired to the vehicle at one time, but only one can be connected at any given time. To pair a phone, the customer must know how to operate the Bluetooth ® functionality of their phone. The pairing process must only be done one time for each phone, unless that phone"s information is deleted. For safety reasons, the pairing process is disabled while the vehicle is moving.

Diagnostic Aids


• The purpose of this diagnostic is to verify the ability of the telematics communication interface control module to pair to a Bluetooth ® device.

• Before performing this test, verify compatibility of the cellular phone(s) the customer is attempting to use with the vehicle. Based on the cellular phone"s service provider and the manufacturer"s implementation of Bluetooth ®, not all phones support all available Bluetooth ® functionality. A vehicle and feature compatibility list will be provided via the GM Bluetooth ® website: http://www.gm.com/vc/bluetooth/

• If the vehicle passes the following tests and a compatible device is being used, the concern may be due to a device malfunction or an incomplete/improper pairing attempt.

• A Bluetooth ® test tool or equivalent can also be used to verify the ability of the customers cellular phone(s) to pair with another device.



Schematic Reference

OnStar Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

OnStar Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Verify DTC B2485 is not set.

2. If DTC B2485 is set , refer to DTC B2485

3. Set up a Bluetooth ® test tool or equivalent.

4. Ignition ON, perform the discovery/search operation with the test tool. Verify the vehicle appears in the list of available devices.

5. If the vehicle is not in the list of available devices, repeat the discovery/search operation. If the vehicle is still not in the list of available devices, replace the T4S communication antenna - Bluetooth. Repeat the discovery/search operation. If the vehicle is still not in the list of available devices, replace the K73 telematics communication interface control module.

6. Follow the instructions provided in the Vehicle Owners Manual for pairing a device. Verify successful pairing with the test tool.

7. If pairing is not successful, repeat the pairing process. If pairing is still not successful, replace the K73 telematics communication interface control module.

8. Refer to Diagnostic Aids.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Wireless Communication Interface Antenna Replacement

• Control Module References for telematics communication interface control module replacement, setup, and programming