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 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.
Eject all the CDs before removing the audio unit and CD changer to prevent damaging the CD player's loading mechanism.

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

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

NO - Go to step 2.
Turn the ignition switch to LOCK (0).
Check the No. 1 (10 A) fuse and the No. 14 (7.5 A) fuse in the under-dash fuse/relay box and No. 1 (30 A) fuse (auxiliary under-dash fuse box) on the wire harness near the under-dash fuse/relay box.
Are the fuses OK?

YES - Go to step 4.

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

YES - Go to step 5.

NO - Reconnect the connector, and recheck the function.
Turn the ignition switch to ON (II).
Measure the voltage between body ground and audio unit connector A (24P) terminal No. 14 and No. 24.

Fig 1: Measuring Voltage Between Body Ground And Audio Unit Connector A (24P) Terminal No. 14 And No. 24
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage on the both terminals?

YES - Go to step 7.

NO - There is an open in the wire (s) between the No. 1 (10 A) fuse and the No. 14 (7.5 A) in the under-dash fuse/relay box and the No. 1 (30 A) fuse (auxiliary under-dash fuse box) on the wire harness near the under-dash fuse/relay box and the audio unit.
Turn the ignition switch to LOCK (0).
Reconnect audio unit connector A (24P).
Turn the ignition switch to ON (II).
Measure the voltage between audio unit connector A (24P) terminal No. 12 and body ground.

Fig 2: Measuring Voltage Between Audio Unit Connector A (24P) Terminal No. 12 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES - Replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).

NO - There is an open or high resistance in the wire between audio unit connector A (24P) terminal No. 12 and body ground (G503).