Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 321 (CELLULAR COMMUNICATION SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESONSTAR CALL CENTER REMOTE FUNCTION REQUESTS INOPERATIVEDIAGNOSTIC AIDS

2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Diagnostic Aids

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Diagnostic Aids

WARNING: This page is about a different car, the 2006 Chevrolet Monte Carlo and 2006 Chevrolet Impala. 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: Cellular Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
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 in Horns Go to Diagnostic Starting Point - Lighting Systems in Lighting Systems Go to Diagnostic Starting Point - Doors in Doors
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

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.