Schematic Reference: OnStar Schematics

Connector End View Reference: Cellular Communication Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Important: The vehicle must be located in a quiet area.

1. Turn ON the ignition, with the engine OFF.
2. Press the OnStar® Call Center button.
3. Ask the OnStar® operator if your voice can clearly be heard.

Does the OnStar® operator hear your voice?

Go to Step 3

Go to OnStar Microphone Inoperative - Caller Cannot Be Heard

1. Press the Call Answer button.
2. Pronounce all hands-free commands. Refer to OnStar Description and Operation for proper pronunciation.

Did the OnStar® system recognize any of the voice commands?

Go to Step 5

Go to Step 4

1. Press the Call Answer button.
2. Have another person pronounce all hands-free commands. Refer to OnStar Description and Operation for proper pronunciation.

Did the OnStar® system recognize any of the voice commands?

Go to Step 5

Go to OnStar Description and Operation

The system is operational, but cannot identify certain word commands due to pronunciation. For tips on proper pronunciation refer to OnStar Description and Operation .

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2