ACC Unit
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
The ACC unit uses input from the millimeter wave radar to control the vehicle's speed and brakes to maintain a constant distance between the vehicle and other moving vehicles directly ahead.