Circuit/System Description
WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
The vehicle navigation radio and OnStar® system both utilize the cellular microphone to receive voice commands. The navigation radio receives an audio voice signal from the vehicle communication interface module (VCIM).