Muting Signal Logic

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The audio muting logic is orchestrated by the audio unit. The audio 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.

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 in use, the rear speakers are muted, and the navigation voice prompts are heard from the front speakers.