When I bought my 2001 V70 three years ago the HU603 radio back lighting & steering wheel controls did not work. After joining the VOC Forum I realised that it must be a replacement unit but just lived with it until my OCD to have everything working got the better of me and so I have just purchased another HU 603 Head Unit from ebay.
The 'new' replacement was a unit from the same model and year as mine and I am delighted to say it was a 'Plug & Play' straight swap, with full back lighting & working steering wheel controls! The best £30 I have spent in a long while
