The windows appear to have an extremely tight fit in the upper window frame which is noticable when closing both doors. Resynchronization in accordance with the instructions in the owner's manual appears to have no effect. The manual also states that " When opening a door the window lowers slightly. After closing the door, the window closes again." This feature is not working For now, I am manually slightly lowering the window and then closing the door. Any ideas where to start looking to solve this issue. All other functions associated with the windows work fine.
It's not clear to me from this what the actual problem is other than the windoes have a tight fit. What happens when you close the dor with the window lowered? The window won't go up properly?
The window glass on the SL (and some other MBZ cabriolet, roadster and coupe models) is frameless. To cut down on wind noise and prevent any leaks, the top edge of the glass actually fits into a channel in the rubber seal in the top. This is much the same way that the glass on a sedan fits into the top channel of the door frame when raised. With this tight fit, it is necessary for the glass to be slightly lowered when opening or closing the door to clear the outer lip of the seal. Otherwise, it would be very difficult to open the door and could even damage the seal or the glass itself. In closing the door, the fully-raised glass would actually push against the outside lip of the seal instead of fitting into the channel, and it would then leak and be noisy. There is a mechanism so that once the door latch is released (either by pulling the inside lever or the outer door handle), the electric window motor will automatically lower the glass about half an inch. The glass remains slightly lowered until the door is again closed, which causes the glass to be fully raised automatically to fit tightly in the seal.
My first question in diagnosing would be to ask if this is happening on both doors or just one. If it's both, then I'd suspect something has gone awry in the module (or its wiring, i.e. maybe a simple fuse failure) that controls this. If it's just one door, then I'd suspect it's a failure of the that door's latch sensor.
Yes. I had a related problem with my CLK cabrio on the driver's door (on right). The window would drop too far and then not rise fully, leaving an inch or so.
The computer needed resetting; it was a simple fix sorted by MB (no cost! MB London), just twiddling with the window button, but the OP said the standard procedure did not work. If a dealer is nearby maybe he can suggest something.
This is happening with both doors. I checked the fuses in the box by the firewall and they are ok. Are there any fuses for this system hidden somewhere else? Going through the 129 service DVD was no help either. At least I could not find anything on this problem.
What year is your 129? The early ones did not have the lowering feature. The window seals are L shaped where the glass seats. The later version, with the lowering feature, has an upside U shaped seal.
You are right on I finally found it under the dealer service bulletins re. POWER SOFT TOP CONTROL MODULE WITH SHORT STROKE POWER WINDOW CONTROL in the 129 service dvd. This feature was phased into production in Dec 1994. Build date of my
129 is Nov.94. but sold as a 95 with a 95 owner's manual describing this feature. Peter
MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.