Operation of the Hands Free Cellular Phone
The hands free, personal calling cellular phone feature is an additional option to the OnStar® system. During a hands free call, the microphone and audio system operate the same way as a standard 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 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 though the speakers. The call will be answered when the answer/end call button is pressed.
All the voice activated commands are interpreted by the Vehicle Communication Interface Module. 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 the caller can say "HELP" and the VCIM will return an audible list of available commands. If the customer concern is not being understood or not being heard by the OnStar® system, the user should place a call to the OnStar® call center to verify proper operation of the microphone. Here is an example of the commands and the OnStar® system responses. A complete list of command is supplied in the information provided to the customer with the OnStar® system.