Audio unit button does not work (without navigation)

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.

NOTE:

Check the vehicle battery condition first (see BATTERY TEST ).
Check the connectors for poor connections or loose terminals.
In order to troubleshoot the main power switch, go to AUDIO UNIT POWER SWITCH WILL NOT TURN ON

Operate all items in the appropriate switch list.
Switch list

AM, FM, XM, DISC/AUX, TITLE, Preset 1-6, SCAN, RPT, A.SEL/RDM, SKIP, VOL, SOUND

Do all the Items in the appropriate switch list work properly?

YES -Operation is normal.

NO -Substitute a known-good audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). If the symptom/indication goes away, replace the original audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). If the symptom still present, substitute a known-good audio panel (see AUDIO UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original audio panel (see AUDIO UNIT REMOVAL/INSTALLATION ).