Unit Check (Quick Check): Aircon
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.
This diagnostic tests the climate bus connection (AC-SI and AC-SO) between the audio-navigation unit and climate control unit. Make sure the engine is running for this test.
When the connection appears NG, go to the NAVIGATION CANNOT CONTROL HVAC BY VOICE COMMAND .