Global Positioning System Module: Service and Repair

Telematics Control Module (J499)

• If the Telematics control module was replaced, the OnStar system must be re-configured. Refer to => [ Telematics Control Module , Configuring ] Testing and Inspection.

• Do not swap out any Telematics control module between different vehicles! Each Telematics control module has a special identification and an electronic serial number that matches the VIN. Using this data, the vehicle is identified by the OnStar Call Center and assigned to the respective customer account.





• To diagnose, use the "Guided Fault Finding" function of the Vehicle Testing, Measurement, And Information System ( VAS 5051B). Before removing the Telematics control module, while diagnosing with the Vehicle Diagnostic, Testing And Information System (VAS 5051B) in the "replacing the J499 - Telematics control module" function, the option will be offered to read out the coding and then reprogram it in the new Telematics control module after it has been replaced.

The Telematics control module is installed behind the left side trim.

Removing

- Disconnect the battery.

- Remove the right side trim panel.

- Remove speaker mount - 1 -.





- Disconnect harness connector - 2 - at the speaker.

- Remove protective housing - 1 - under the speaker.





- Remove cover - 2 - at the protective housing.

- First disconnect 42-pin harness connector - 2 - at the Telematics control module.





- Disconnect antenna connectors - 1 - and - 3 - on the Telematics control module.

Installing

Install in reverse order of removal, noting the following:

The Telematics control module was replaced:

- Code the Telematics control module, refer to => [ Telematics Control Module , Coding ] Testing and Inspection.

- Configure the Telematics for the OnStar functions, refer to => [ Telematics Control Module , Configuring ] Testing and Inspection.