Buick Regal: OnStar Call Center Remote Function Requests 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.
• Refer to Diagnostic Procedure Instructions for an overview of each diagnostic category.

Circuit/System Description

The telematics communication interface control module has the capability of commanding the horn, initiating door lock/unlock, or operating the exterior lamps using the serial data circuits. These functions are commanded by the OnStar Call Center per a customer request.

Diagnostic Aids

The customer concern may have been due to a lack of cellular service in a given area, or a failure in the National Cellular Network infrastructure that has since been corrected.

Reference Information

Schematic Reference

OnStar/Telematics Wiring Schematics

Connector End View Reference

Component Connector End View Index

Description and Operation

OnStar Description and Operation (UE1 with IOB/IO6) , OnStar Description and Operation (UI3) , or OnStar Description and Operation (UE1 without IOB/IO6).

Electrical Information Reference

• Refer to Circuit Testing
• Refer to Connector Repairs
• Refer to Testing for Intermittent Conditions and Poor Connections
• Refer to Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

NOTE:

• It is necessary to inform the OnStar Call Center advisor that this call is for vehicle diagnostic purposes.
• It is necessary to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

1. Ignition ON/vehicle in Service Mode.

2. Verify that the horn, lights, and the door locks on the vehicle operate properly.

• If an applicable vehicle system does not operate properly

Refer to Diagnostic System Check - Vehicle.

• Go to next step: If all applicable vehicle systems operate properly

3. Verify that a call can be successfully placed to the OnStar Call Center by pressing the blue OnStar button.

• If unable to contact the OnStar call center

Refer to Unable to Contact OnStar Call Center

• Go to next step: If able to contact the OnStar Call Center

4. Verify with the OnStar advisor that all remote functions (door locks, lights, and horn) work.

• If the remote functions do not operate when requested

Replace the K73 Telematics Communication Interface Control Module

• Go to next step: If the remote functions operate when requested

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

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

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