How to adjust radios brightness

Dimmer High/Low
This sub-menu sets the radio’s display brightness to high (DIMM HIGH),
medium (DIMM MEDIUM), or low (DIMM LOW).

To access the DIMMER sub-menu:

Press and hold the Right-Front Knob(3) for three seconds.

Rotate the Right-Front Knob(3) until DIMMER appears on the screen.