Muting Signal Logic

The audio muting logic is orchestrated by the navigation unit. The navigation unit determines what audio source has priority to use the speakers.

The priority of the audio sources is as follows:

HandsFreeLink has the highest priority, followed by, navigation, and finally the radio/CD player. The priority is passed by HandsFreeLink to the navigation unit by dedicated mute wires. The navigation mute signal is passed to the stereo amplifier.

The navigation unit temporarily disables the voice control buttons, but allows guidance to be heard. In addition, the navigation unit suppresses the output from the XM receiver, disc player, or other audio accessories.

When the navigation system sends out a voice route guidance command, the rear speakers are muted, and the navigation voice is heard in the front speakers.

When the navigation voice control system and HandsFreeLink is use, the rear speakers are muted, and the navigation voice prompts are heard from the front speakers.