September 30: LEMON manuals is back up on a temporary server! Slowness is possible
Unit Check (Quick Check): HFL
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
This checks the four-wire communication bus between the HFL and the audio-navigation unit.
Courtesy of AMERICAN HONDA MOTOR CO., INC.