Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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.

OnStar Call Center Remote Function Requests Inoperative

Step	Action	Yes	No
Schematic Reference: OnStar Schematics Connector End View Reference: Entertainment/Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Attempt to honk the horn, operate the lights, and lock or unlock the doors on the vehicle. Does the applicable system operate properly?	Go to Step 3	Go to Diagnostic Starting Point - Horns Go to Diagnostic Starting Point - Lighting Systems
3	IMPORTANT: It is necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes. Contact the OnStar® Call Center by pressing the blue OnStar® button. Ask the OnStar® advisor to perform a remote function (door lock/unlock, light flash, or horn honk). Was the attempt successful?	Go to Diagnostic Aids	Use the scan tool to access the STID and ESN and contact the General Motors Technical Assistance Center