Here's what the small text in the owner's manual says:
Backlight "Instrument backlighting adjustment"
Backlighting of instruments and gauges (needles of scales and displays) can be ad-
justed at three levels.
This parameter may be adjusted during the initial check cycle. Short-press the
"MODE" button and to access the function. Press the "MODE" button to display the
following levels:
- 1 (Minimum)
- 2 (Medium)
- 3 (Maximum)
After three seconds with no input from the "MODE" button, or once the vehicle speed
exceeds 3.11 mph (5 Km/h), the value is stored and the display returns to trip journal
mode.