Operation of the Hands Free Cellular Phone

The hands free cellular phone is an additional feature to the OnStar system. During a hands free call the microphone and audio system work the same was as a normal OnStar call. When the answer/end call button is pressed, the audio system will mute, the OnStar system will then return the prompt "ready." At this point there is a specific command set to initiate a cellular call. If the vehicle receives a call when the radio is On, the audio system will mute and an audible "ring" will be heard through the speakers. The call will be answered when the answer/end call button is pressed.

All the voice activated commands are interpreted by the Communication Interface Module (CIM). A list of these commands is supplied in the information provided to the customer. If the information is not available to reference, at any command prompt you can say "HELP" and the CIM will return an audible list of available commands. If the customer concern is not being understood or not being heard by the OnStar system, place a call to the OnStar Call Center to verify proper operation of the microphone. A complete list of commands is supplied in the information provided to the customer with OnStar system.