Bit of a similar problem apart from 3 of mine go down via centre button but the 4th one won't but will work via drivers unit, been told 99% of these problems lead to the temic module sensor, Renault have quoted me £150 fitted to fix this problem which is at a reduced rate due to them knowing about this fault as they don't sell temic separate it only comes with complete regulator and motor but if you look on eBay you can get your old ones repaired or buy aftermarket ones which are plug n play for about £40 a pair, so I'll be going down this route first before parting with £150, I'll keep you posted and let you know if any joy
