most likely the window regulator has gotten damp, my 2003 meganes passenger window failed to work afew months ago so i had a look to see what the problem was, remove the 2 torx screws at the bottom of the door panel, use a flat screwdriver to pop off the door handle cover then remove the torx screws there, use small flat screwdriver too pop off the small round cover behind the door opening handle and remove that screw, now the hidden screw! remove door pocket by prizing it up under the left hand side then the right until it comes up, now you have to prize up the panel that the pocket was in, use a flat screwdriver along the bottom to pop it up, it will swing upwards on its plastic hinges and you will see the screw in the centre of the door, remove it, the outer edge of the panel can be hard to pop i used large screwdriver moving around it and levering, lift up the panel slightly to unhook it from the top, lean panel back towards you and you will see the regulator, my door had a lot of condensation inside it which causes the problem in damp weather, unclip the wiring from the bottom of the unit, remove small philips head screw from top of the unit and then lever out the bottom clips as your pulling off the unit, with the unit removed you will see that it has a circuit board inside it, this is what gets damp and stops it working, i used a heat gun to dry it out or a hairdryer will do the job as well, only takes a few minutes, when your sure its good and dry refit it back on the door and plug in your wires again, now turn on your ignition and check if your window is working, just a small amount up and down will do to confirm it, now what i did was spray the unit with a wax sealer, i had a can of wynnes body cavity sealer handy so thats what i used, its messy stuff but you could probably get other types of sealer which are cleaner to use, and thats it, just replace everything as you took it off, mines been working fine for 5 months now, beats paying out the 280 euro i was quoted for a full unit by renault!
liam, February 2010