Display day/night mode does not work

WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Always check the connectors for poor connections or loose terminals.
Before troubleshooting, get the navigation system anti-theft codes.
After troubleshooting, enter the navigation system anti-theft codes.
Full brightness on the instrument panel brightness control causes the system to stay in the day mode, even when the lights are on.

Make sure the instrument panel brightness control is not on full brightness.
Change the day/night mode under Set-up and recheck.
Does the display change to day and night modes?
1. YES - The system is OK at this time.
2. NO - Go to step 3.
Go into the Diagnostic Menu and use the "Car Status" test to check for an ILL signal (see CAR STATUS ).
Is "ILL" signal OK?
1. YES - The system is OK.
2. NO - Check the ILL+ circuit between the navigation unit and No. 7 (7.5 A) fuse in the passenger's under-dash fuse/relay box.