Audio Remote, HFL-Navigation Voice Control Switch
WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.
The navigation voice control switch is combined with the audio remote switch and the HFL switch Navigation TALK/BACK commands are sent to the audio-navigation unit via the HandsFreeLink control unit using the GA-net bus