Replacing Window Regulator Assembly
- Roll down the window about 80% down. Using a torx T20 driver, unscrew this torx/washer combination.
- Manually, pull the window up to the very top/fully closed position. It should stay put there. You can also ask someone to hold it to make sure it stays in this fully closed position or alternatively you can use some tape.
- Remove the bottom bolt also using the 10mm crescent wrench.
http://www.bmwtips.com/tipsntricks/W...or/replac3.jpg
- Ok, see this top starburst shaped bolt in the picture below? It's behind that soft plastic window. No, you don't get to it that way. It's also behind the glass window. If it weren't you could use a straight hex bolt driver but life isn't that easy. Get your 10mm crescent wrench, and stick your hand under the sheet metal and reach behind the window glass and remove the bolt.
http://www.bmwtips.com/tipsntricks/W...or/replac4.jpg
- Pull off the wiring harness of the window motor assembly. Using a Torx T25 remove the four torx screws from the motor assembly. These screws are pointed to at the right.
- Pull the regulator assembly up and pull the bottom towards the front of the car. Now you can slide it out.
- Replace with the new window regulator assembly. Slide the assembly's bottom bolt into its cradle. Now here's the really hard part: Screwing back the top bolt requires a bit of manual dexerity. I spent what seemed like a good 15-20 minutes just trying to screw this top bolt back. See the project notes below for more details.
- Tighten the bottom bolt.
- Screw the window motor assembly back to the door.
- Pull the window down to the shuttle part and put the torx screw/washer back on. Set it back into position and screw the T20 torx/washer assembly back on. Don't overtighten it to the point where the glass cracks!
- Plug the window switch back into the harness and make sure the window goes up and down (Oh yeah, if it doesn't, make sure the key is in the second position, the child window locks are not engaged. If the window is not moving freely, then unbolt the torx screw/washer and make sure the window glass is on the right track and hasn't rotated. Don't force anything if there is resistance or if the window is not on the right track or else you might break the window.) Otherwise, If it's working correctly/smoothly, then you're good to go.