Blind Spot Information System (BSI) Control 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 BSI control unit uses input from the BSI radar units. The BSI radar units also detects its own errors, and it signals the BSI control unit if an error is detected.