Muting Signal Logic

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

The priority of the audio sources is as follows:

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

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

When the navigation system sends out a voice route guidance command, the front speaker(s) sound is reduced, and the navigation voice is heard in the front speaker(s).

When the navigation voice control system is in use, all of the speakers are muted, and the navigation voice prompts are heard from the front speaker(s).