Since we bought our 2005 OBS 6 months ago, I've noticed that both the clock and radio illumination seem dimmer than other cars.

 

They are barely visible on brighter days, and if you need the headlights on a rainy day they dim like they are supposed to, but the displays are almost dark. I'm familiar with the illumination control for the instrument panel, but is there any way to adjust the clock or radio illumination?

This sounds like it may be a tired display. on my 2005 OB sedan there is the trip computer/clock combo with a illumination button and a + - to set the clock. On an imprezza I am not sure how the display works. Do you have the owners manual? The display is just low/hig and not variable.