Is it possible to adjust the brightness of clock and radio display in Mitsubishi Outlander 2.0 DI-D 4WD Instyle (2007 model)? If there is any sunlight, it is impossible to see anything on the display. I know how to adjust brightness on the main instrument panel, but that does not affect radio & clock.

The Bose Wave Radio has two brightness levels: Bright Hi (with a range of 8-15, and default of 10) and Bright Lo (1-8, default 4). The radio automatically goes from Hi to Lo when a room is darkened so the display doesn't interfere with sleep.
On recent models you can reset the defaults to make the display brighter or dimmer in both Hi and Lo levels.
1. Press and hold the Alarm Setup (Menu) button on your remote until -setup menu- appears in the display.
2. Then press the Tune/MP3 button until Bright Hi- appears. Use the Time - or Time + buttons to change the settings.
3. Go to Bright Lo- and adjust that setting too if necessary.
4. Press Alarm Setup (Menu) again to exit setup, or simply wait 10 seconds.
You're done! Note that if you set both Hi and Lo to 8, the brightness will stay the same all day and night.

From the manual:

This alarm clock radio features an adjustable display backlight, with dim, medium, and bright settings. To select a backlight setting, press the Snooze/Dimmer Bar until the desired brightness is reached.

The clock and radio memory use a different power source than the radio - - that source is not controlled by the key switch. I would check the fuses first to see if you blew one that is hot all the time.

Press the snooze button 4 times. The display toggles between lo/high brightness. ;-).

Remove the 3 knobs for air system.
Remove the 2 small philip screws at bottom.
Pull bezel straight out.
Remove 4 larger philip screws on either side of radio.
Pull radio straight out.
To find out if your radio has "AUX IN", hold CD button for about 2-3 secs. If AUX appears on display your model has "AUX" connector in back. 2003 and early 2004 do not have "aux in".

check it out w/dealer and some mitsubishi seems like there is an issue with some corrosion in the antenna base on some models from 2007. Under warranty replaced the antenna base.

you could try to internally change the brightness, but unless you know a lot about circuits, I wouldn't mess with the internal wiring.

I just got a similar model at Big Lots a few months ago. A T439S. There some funky stuff they do with those displays it could be that the lamp is wearing out. 7 years is good life for them.

Our Bose did the same thing after a power outage. This one doesn't have a CD button, so we tried holding down the Clock button and used the volume control and that seems to have fixed it.

unless it is an automatic , atomic clock none I have ever owned do the change automatically