I am presently going through the heartbreak of a radio change, having done several previous posts on it. My V70 HU-850 disc unit self destructed and having researched the numerous threads on the subject I learnt it's full of all sorts of issues associated with software compatibility.
So I purchased a used HU-850 from the same year model as my car a 2005 V70, whilst all functional controls (including the steering wheel controls) work fine the radio back lighting does not illuminate. Other than a guy in the States who converted the back lights to blue LED's I have not come across anybody who has had a successful transplant.
My current plan is to use the front panel from the original radio and graft that onto the used unit.
I suggest you avoid the used replacement route if you can avoid it and consider taking a hit by install a modern all singing and dancing head unit. I am afraid that if my front panel project does not work that will be my next action.
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