Audio unit power switch will not turn on (No information display and no sound) (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.
Eject all the discs before disconnecting the audio unit and CD changer to prevent damaging the CD player's load mechanism.
Before troubleshooting, make sure you have anti-theft codes for the audio unit.
After troubleshooting, enter the anti-theft codes for the audio unit.

Turn the ignition switch to ON (II).
Push the power switch ON to see if the audio unit turns on.
Does the audio unit display operate properly, and does the audio unit sound normal?

YES -Intermittent failure, the system is OK at this time.

NO -Go to step 3.
Turn the ignition switch to LOCK (0).
Check the No. 5 (10 A) fuse and the No. 32 (10 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?

YES -Go to step 5.

NO -Replace the fuse(s), and recheck.
Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). Check that the audio unit connectors are properly connected.
Are they connected properly?

YES -Go to step 6.

NO -Repair poor connections and reconnect the connector(s), and recheck.
Turn the ignition switch to ON (II).
Measure the voltage between body ground and audio unit connector A (17P) terminals No. 14 and No. 17 individually.

Fig 1: Measuring Voltage Between Body Ground And Connector A (17P) Terminals No. 14 And No. 17
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 8.

NO -Repair an open in the wire(s) between the No. 5 (10 A) fuse and the No. 32 (10 A) fuse in the under-dash fuse/relay box and the audio unit.
Measure the voltage between audio unit connector A (17P) terminal No. 9 and body ground.

Fig 2: Measuring Voltage Between Connector A (17P) Terminal No. 9 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Substitute a known-good audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).

NO -Repair an open or high resistance in the wire between audio unit connector A (17P) terminal No. 9 and body ground (G504) (see CONNECTOR TO FUSE/RELAY BOX INDEX ).