You might want to look into downloading VIDA on to a computer. It's the shop manual for volvos. Hopefully it'll have a diagram showing that cable which goes from the batt to the engine compartment to help you troubleshoot. You can also get a DICE setup for a laptop which lets you interface with car thru the OBDII port. That's more complicated. But with VIDA on your computer you can see exploded views of all the car's systems, look up part #s, get repair procedures, etc.
I use a Virtual Machine setup: https://forums.swedespeed.com/showth...-Download-Link
I could look up the info in VIDA for you when I get some time but I haven't figured out how to copy and paste into a forum post.
2007 XC70, 206,000 miles
2002 V70XC, 130,000 miles, parts car
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