OnStar Call Center Remote Function Requests Malfunction

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5317754 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 K73 Telematic 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 Schematics Connector End View Reference Master Electrical Component List 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

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, 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. ⇓ If all applicable vehicle systems operate properly
2. 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 ⇓ If able to contact the OnStar Call Center
3. 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 Telematic Control Module. ⇓ If the remote functions operate when requested
4. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Refer to: Control Module References for control module replacement, programming and setup.