OnStar Call Center Remote Function Requests Inoperative

OnStar Call Center Remote Function Requests Inoperative

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 Instructions)provides an overview of each diagnostic category.



Circuit/System Description

The vehicle communication interface module (VCIM) has the capability of commanding the horn, initiating door lock/unlock and operating the exterior lamps using the serial data circuits.


Reference Information
Schematic Reference

OnStar Schematics (OnStar Schematics)
Connector End View Reference

Component Connector End Views (Component Connector End Views)
Description and Operation

OnStar Description and Operation (OnStar Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Programming and Relearning (Programming and Relearning)


Diagnostic Aids

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


Circuit/System Verification

Important: It is necessary to inform the OnStar(R) Call Center advisor that this call is for vehicle diagnostic purposes.



1. Observe that the horn, lights, and the doors locks on the vehicle operate properly.

• If the applicable system does not operate properly, refer to Diagnostic Starting Point - Horns (Initial Inspection and Diagnostic Overview) , Symptoms - Lighting Systems (Symptoms - Lighting Systems) , or Symptoms - Remote Functions (Symptom Related Diagnostic Procedures) - Doors respectively.

2. Contact the OnStar(R) Call Center by pressing the blue OnStar(R) button. Verify with the OnStar(R) advisor that all of the remote functions (door locks, lights, or horn) work.

• If the remote functions do not work, use the scan tool to access the STID and ESN and contact the General Motors Technical Assistance Center.