Audio unit button illumination does not work (without navigation)

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Check the vehicle battery condition first (see 12 VOLT 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 -
- Except DX model: Intermittent failure, the audio unit is OK at this time. Check for loose or poor connections at the audio unit connector A (24P).
- DX model: Intermittent failure, the audio unit is OK at this time. Check for loose or poor connections at the audio unit connector A (17P).
NO -go to step 4.
Check the illumination of several other buttons not related to the audio system.
Are the buttons illuminated?

YES -
- Except DX model: Go to step 5.
- DX model: Go to step 12.
NO -Troubleshoot the interior lights. Start by checking the No. 29 (10 A) fuse in the under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the under-dash fuse/relay box and the audio unit.
Turn the ignition switch to LOCK (0).
Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
Disconnect audio unit connector A (24P).
NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD player's load mechanism.
Disconnect the gauge control module 32P connector.
Check for continuity between audio unit connector A (24P) terminal No. 1 and gauge control module 32P connector terminal No. 6.

Fig 1: Checking Continuity Between Audio Unit Connector A (24P) And Gauge Control Module 32P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -go to step 10.

NO -Repair 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, measure the voltage between audio unit connector A (24P) terminal No. 13 and body ground.

Fig 2: Measuring 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 connections are OK, replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).

NO -Repair an open in the wire between the under-dash fuse/relay box and the audio unit.
Turn the ignition switch to LOCK (0).
Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
Disconnect audio unit connector A (17P).
NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD player's load mechanism.
Disconnect the gauge control module 32P connector.
Check for continuity between audio unit connector A (17P) terminal No. 1 and gauge control module 32P connector terminal No. 6.

Fig 3: Checking Continuity Between Audio Unit Connector A (17P) Terminal No. 1 And Gauge Control Module 32P Connector Terminal No. 6.
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 17.

NO -Repair an open in the wire between the gauge control module and the audio unit.
Turn the ignition switch to ON (II).
With the combination light switch still in the PARKING light position, measure the voltage between audio unit connector A (17P) terminal No. 10 and body ground.

Fig 4: Measuring Voltage Between Audio Unit Connector A (17P) Terminal No. 10 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Check the connections at audio unit connector A (17P) If all connections are OK, replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).

NO -Repair an open in the wire between the under-dash fuse/relay box and the audio unit.