interior lighting problem tied with headlights

[40oz]

Okay first I would like to tell you these probelms started to occur right after I came back from the dealership from a free 1000 mile check up. I know If I go back to the dealership they can fix it for free, but if it is a simple fuse fix then I would not like to drive back there.

My dash lights do not come on and it sucks driving at night. Also secondly what i found wierd was, the led back lighting for the radio and for the clock comes on when the headlights are off but when I turn on the headlights they turn off automatically, which makes driving at night even worse.

I have a feeling this is not a fuse problem but thought I'd ask anyways. It seems like a switch or ecu problem. Do I have to drive a 45 mile round trip just to get this fixed, I just came back today from there :(

I used to have access to toyota wiring diagrams but not anymore so it kinda sucks not being able to pinpoint the problem yourself.