Muting Signal Logic

The audio muting logic is controlled 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:

On-Star ('05-06 models) has the highest priority, followed by HFL, AcuraLink, navigation, and finally the radio/CD-DVD player. The priority is passed by On-Star ('05-06 models), HFL, and AcuraLink to the audio unit by dedicated mute wires. The navigation mute signal is passed to the audio unit on the GA-Net bus.

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

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

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 speakers.