Circuit/System Description
WARNING: This page is about a different car, the 2008 Pontiac Torrent and 2008 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The vehicle navigation system utilizes the cellular microphone to receive voice commands. The cellular microphone is wired directly to the navigation radio and consist of a 9-volt signal circuit and a low reference circuit.