How the Circuit Works: Muting
WARNING: This page is about a different car, the 2011 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
The audio-navigation unit orchestrates all muting logic. All voice commands are broadcast over the front audio speakers. The HFL system has the highest priority followed by navigation voice and then the audio-navigation unit CD/DVD or AM-FM-XM music channels.