Audio Unit Button Illumination Does Not Work (Without Navigation)

WARNING: This page is about a different car, the 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. 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 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 (24P).

NO - Go to step 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 dashboard illumination circuit.
Turn the ignition switch to LOCK (0).
Disconnect audio unit connector A (24P).
NOTE: Eject all the CDs before removing the audio unit and audio disc changer to prevent damaging the CD player's loading mechanism.
Disconnect gauge control module connector A (32P).
Check for continuity between audio unit connector A (24P) terminal No. 1 and gauge control module connector A (32P) terminal No. 1.

Fig 1: Checking Continuity Between Audio Unit Connector A (24P) Terminal No. 1 And Gauge Control Module Connector A (32P) Terminal No. 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 9.

NO - There is an open in the wire between the gauge control module and the audio unit.
Turn the ignition switch to ON (II).
With the headlight switch still on, check for voltage between audio unit connector A (24P) terminal No. 13 and body ground.

Fig 2: Checking For Voltage Between Audio Unit Connector A (24P) Terminal No. 13 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Check the connections at audio unit connector A (24P). If all the connections are OK, replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).

NO - Check the No. 29 (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, repair an open in the wire between the under-dash fuse/relay box and the audio unit.