Display Day/Night Mode Does Not Work

Display day/night mode does not work

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.

1. Change the day/night mode to auto 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 2.

2. Go into the Diagnostic Mode, and use the "Car Status" diagnostic to check for an ILL signal.

Is the "ILL" signal OK?

YES - The system is OK.

NO - Check the ILL+ circuit for an open or short to ground between the navigation unit and small light relay. If OK, substitute a known-good navigation unit and recheck.