My wife's xc90 has had intermittent problems with the radio not powering on. Sometimes it would come on after several minutes. Now nothing. It hasn't powered on in about a month.
Here's what I researched, and what I've tried: I've heard that the ICM goes bad, or the cold solders break. My friend builds circuit boards for a living, and he took apart the radio and found nothing wrong.
I checked both fuse boxes (by driver's door and under steering wheel. Both have power. Maybe there's another fuse location too? Can't explain why it needs 2 locations...but why not 3 right?
I dont know why it took so long, probably because I was tired of triggering the srs light from disconnecting the radio, but I seem to have narrowed the problem down...but I'm not experienced at reading diagrams.... The violet wire that goes to the back of the radio does not have power. I think I traced it back to a gray harness that has a pink wire in the other side...also no power there. (Attached picture) It's definitely not the red wire. That feeds the violet/white that brings power to climate control, heated seats, etc.
If I could find out where the pink wire leads, maybe I can find out why there's no power.
Are there any relays that would be between the fuse box and radio?
All help is greatly appreciated.
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