Display Day/Night Mode Does Not Work

Display day/night mode does not work

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

1. Make sure the instrument panel brightness control is not on full brightness.
2. Change the day/night mode under Set-up and recheck.

Does the display change to day and night modes?

YES - The system is OK at this time.

NO - Go to step 3.

3. Go into the Diagnostic Menu and use the "Car Status" test to check for an ILL signal.

Is "ILL" signal OK?

YES - Replace the navigation unit.

NO - Check the ILL+ circuit between the navigation unit and No. 14 (7.5 A) fuse in the under-dash fuse/relay box.