Audio-navigation switch panel button illumination does not work

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 Honda Odyssey, 2016 Honda Odyssey, 2015 Honda Odyssey, 2014 Honda Odyssey, and 2013 Honda Odyssey. 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.

Turn the ignition switch to ON (II).
Turn the combination lighting switch to the parking light position.
Check the illumination of the audio-navigation switch panel buttons.
Are the buttons illuminated?

YES -Intermittent failure, the audio-navigation switch panel is OK at this time. Check for loose or poor connections at the audio-navigation unit connector A (24P).

NO -Go to step 4.
Check the illumination of several other buttons not related to the audio system.
Are the buttons illuminated?

YES -Check for B-CAN DTCs (communication BUS Line Error) with the HDS and go to the indicated DTC's troubleshooting.

If no B-CAN DTCs or communication bus line errors are found, substitute a known-good audio-navigation unit (including the HDD) (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).

NO -Troubleshoot the interior lights. Start by checking the No. D25 (7.5 A) fuse in the passenger's under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the passenger's under-dash fuse/relay box and the audio-navigation unit.