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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 ).
Make sure that the correct DVD color and version are installed.
Check any official Honda service website for more information about the navigation system.
Check the connectors for poor connections or loose terminals."
Before troubleshooting, make sure you have the navigation system anti-theft code.

Check the No. 1 (15 A) fuse in the under-dash fuse/relay box and the No. 14 (7.5 A) fuse in the under-dash fuse/relay box, and reinstall the fuse if it is OK.
Is the fuse OK?

YES -Go to step 2.

NO -Replace the fuse, and recheck.
Turn the ignition switch to ON (II).
Operate the radio and listen to the audio.
Can you hear the audio?

YES -Go to step 4.

NO -Refer to audio system troubleshooting.
Turn the ignition switch to LOCK (0).
Check for DTCs.
Are there any DTCs stored?

YES -Troubleshoot the indicated DTC, and recheck. If the symptom does not go away, Go to step 6.

NO -Go to step 6.
Measure the voltage between audio-navigation unit connector A (24P) terminal No. 24 and body ground, and between audio-navigation unit connector C (8P) terminal No. 1 and body ground.

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

Fig 2: Measuring Voltage Between Audio-Navigation Unit Connector C (8P) Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage In either terminal?

YES -Go to step 7.

NO -Repair an open in the wire between the under-dash fuse/relay box and the audio-navigation unit.
Turn the ignition switch to ON (II).
Measure the voltage between audio-navigation unit connector A (24P) terminal No. 14 and body ground.

Fig 3: Measuring Voltage Between Audio-Navigation Unit Connector A (24P) Terminal No. 14 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 9.

NO -Repair an open in the wire between the under-dash fuse/relay box and the audio-navigation unit.
Measure the voltage between audio-navigation unit connector A (24P) terminal No. 12 and body ground, and between audio-navigation unit connector C (8P) terminal No. 4 and body ground.

Fig 4: Measuring Voltage Between Audio-Navigation Unit Connector A (24P) Terminal No. 12 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 5: Measuring Voltage Between Audio-Navigation Unit Connector C (8P) Terminal No. 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V in either terminal?

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

NO -Repair an open or high resistance in the wire between the audio-navigation unit and body ground (G503) (see DASHBOARD WIRE HARNESS (VIEW OF MIDDLE SECTION) (WITH NAVIGATION) ).