SUCCESS! It was that 10A fuse! Yay! Radio, dash computer, interior lights and door ajar light back in business. That yellow box had to be pried off from below, then unclipped. Thanks for the info. It saved me at least $100 for the "We'll have a look, but that sounds pretty major." from gar...

I tugged, pulled, torqued and even gently pried, but that little yellow box ain't coming out and the fuses held in it aren't either (pretty near ruined my little fuse pulling tool trying). Its a sort of lock-box it seems. No one I call around town is familiar with it, but the owner's manual has a li...

Interesting. OK, it could be that 10A fuse. I couldn't really check or replace it because I was thwarted by that yellow box/clamp that has those three engine compartment fuses so securely locked up. How do I get the box off or the fuses out? Thanks again for the insights.

Yeah, checked the fuses again last night for good measure and they all look good (but how am I supposed to get at those three in the engine compartment with the yellow box/clamp wrapped around them?) Is the scanning or reading you mentioned a way to figure out the fault without tearing things apart?...

We started with the fuses, but they all check out OK. What next do you think?

OK, so just got the transmission replaced on our 2000 V40 (ouch, $$$) and all is well and good until a week later all of a sudden, all at once, the radio has no power, the clock and the dash computer (MPG, miles to 0, etc...) reset to zero every time the car is turned off and our door ajar light is ...