Audio unit button illumination does not work Honda Ridgeline I

Audio unit button illumination does not work

Note. Check the vehicle battery condition first.

Scheme 49

Scheme 50

1. Turn the ignition switch ON (II).
2. Turn the headlight switch to the parking light position.
3. Check the illumination of the audio unit buttons. Are the buttons illuminated? YES - Intermittent problem: the audio unit is OK at this time. Check for loose or poor connections at audio unit connector A (20P). NO - Go to step 4.
4. Check the illumination of several other buttons not related to the audio system. Are the buttons illuminated? YES - Go to step 5. NO - Troubleshoot the interior lights. Start by checking the No. 4 (15 A) fuse in the under-hood fuse/relay box. If the fuse is OK, check for an open in the wire between the under-hood fuse/relay box and the audio unit.
5. Turn the ignition switch OFF.
6. Disconnect audio unit connector A (20P). NOTE: Eject all the CDs before removing the audio unit and CD changer to prevent damaging the CD player's load mechanism.
7. Disconnect gauge control module connector A (30P).
8. Check for continuity between audio unit connector A (20P) No. 19 terminal and gauge control module connector C (20P) No. 20 terminal. Is there continuity? YES - Go to step 9. NO - Repair open in the wire between the gauge control module and the audio unit.
9. Turn the ignition switch ON (II).
10. With the headlight switch still on, measure the voltage between audio unit connector A (20P) No. 9 terminal and body ground. Is there battery voltage? YES - Check the connections at the audio unit connector A (20P). If all connections are OK, replace the audio unit. NO - Repair open in the wire between the under-hood fuse/relay box and the audio unit.