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. Make sure the instrument panel brightness control is not on full brightness (MAX button pressed).
2. Change the day/night mode to AUTO under Set-up, and recheck.

Does the display change to day and night modes using the headlights?

YES - The system is OK at this time.

NO - Go to step 3.

3. Go into the Diagnostic Mode and use diagnostic 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 navigation unit connector A (20P) terminal No. 5 and under-dash fuse/relay box connector I terminal No. 2. If OK, substitute a known-good navigation unit and recheck.