Navigation display stays on with ignition switch in LOCK (0)

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 connectors for poor connections or loose terminals.
Before troubleshooting, make sure you have the anti-theft code for the audio-navigation unit.
After troubleshooting, enter the anti-theft code for the audio-navigation unit.
Check for aftermarket accessories that may interfere with the navigation system.
The vehicle may have been used for a show event. Check for a short jumper harness in-line with the audio-navigation unit connector A. If a jumper harness is present, remove it, and return it to Tech Line.

Remove the key from the ignition.
Does the navigation screen stay on?

YES -Go to step 2.

NO -The system is OK at this time.
Measure the voltage between audio-navigation unit connector A (24P) terminal No. 14 and body ground.

Fig 1: 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 -Repair a short to power in the wire between the under-dash fuse/relay box and audio-navigation unit connector A (24P).

NO -Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).