akmerc

I've read the manual and searched the forum, but still can't totally figure out an issue with the windows.

I know that there's the convenience feature that allows you to roll them all the way up or down if pressed all the way. However sometimes (it's hard to recreate) when attempting to roll them all the way up with a "full pull" it doesn't work. And sometimes if you hold them with a "full pull" until they are fully rolled up they will go back down about a 1/4 inch???

This happens on both of the front side windows. Anyone heard of this and or know how to avoid it or if it's normal?

thanks,
BZ
new W204 owner

C300Kid

yep, mine have done that a few times in the three years ive had the car..usually lasts a couple days to a week then starts to act normal again. No idea what causes it, I plan on mentioning it next time im in for warranty work.

akmerc

Ok so I'm not alone and the problem has been around for a few years...

Thanks for the response. Maybe someone else will post with their experience.

C300BLK

Yea same exact thing happened to mine just a couple of weeks ago. Just took it into the dealer and they fixed it(still under warranty)

akmerc

Cool! So when you took it in and explained it to them, they knew what you were talking about then?

C300BLK

Yea exactly. Dropped it off and picked it up the next day because I was there for service A1 and I discovered the problem right before my first service and told them about the windows as well. Picked it up and windows worked just fine again. Hope that helped.

akmerc

Awesome, thanks for the info. The car isn't two weeks old yet, and the problem doesn't happen all that often.

So next time it's in, I'll mention it. Thanks for the info!!

Cy3

Same thing happens here. When I pull in to the garage and lift full bore on the two front window switches, drivers side lifts immediately while the passenger side goes about a 1/4 inch then drops completely open. It will go all the way if I pull on the passenger switch again almost like its an electrical load thing going on. Just kind of a P.I.T.A. to hassel with the service department for.

acr2001

This is a normal and common issue. It also happens any time the battery is disconnected. The window(s) affected have lost their 'sync' and need to be re-synced. This happens because the system 'remembers' where "closed" is, and how much force it needed to raise the window - that way when you try to use auto up, it knows when it should be fully up and that it isn't crushing anything.

To resync simply roll your window all the way down, then fully close the window WITHOUT USING THE AUTO UP FEATURE - this means pull the window switch up one click, NOT 2. Once the window is closed continue to hold the button up the 1 click for 5 seconds or so. Voilà, that window is reset.

This is also explained in the owners manual and if you search the forum.

akmerc

I read the manual, and searched the forum. And said as much in the first post.

The explaination, even after being read 3-4 times still didn't make a whole lot of sense to me , so I thought I'd ask.

Your explaination is better than the manuals, so thanks for the post!

acr2001

Ha... the jokes on me. I clearly read your post too fast. Sorry.

akmerc

No worries, you're post helped me. I took a spin and got the drivers working right. The passenger's side took at least 3 tries to get it sync'd now I think I'm good to go!! Thanks!

Now I don't have to listen to my lovely wife talk trash about my new girlfriend, um I mean car!

Gashde

It happens to me sometimes too, but only to my passenger side window, which somehow occur to roll up half a second slower then the other windows

Invain15

common problem, just use the method by Acr2001

akmerc

As a new MB owner its a weird common problem but as u say and Arc2001 explain its pretty easy to fix! Thanks for the info!!

CA-C300

I get this too! I thought i was the only one... ha! It goes weird, then fixes itself. haha.

RLE

Hard to understand why a search couldn't find it since it's been discussed dozens of times since the W204 came out and the same thing happens in the W203 (had both) and the fix is the same. The fix also applies to the sunroof when that goes berserk.

To repeat, hold the window switch in the close position for an additional five seconds after it stops and then in the open position for another five seconds and the fault will be eliminated. If not, do it again.

And when the sunroof fails to one-touch close but just stutters, do the same thing.

You would think after ten years this problem would have been eliminated but nooooo........

jctevere

The problem can occur when a battery is disconnected, but in all of our experiences, it is not always the case. Most of the time it occurs when you are opening/closing the window and hit a rough road surface. This can cause the window to "lose" sync. I must admit though, on all my other cars with automatic windows, this never has happened. But commonly happens on my w204... Go figure.

Perhaps the Mercedes-Benz system is a bit more complex and this is where the car is "over-engineered" where the technology or safety systems are too much sophisticated for their own good.

The process above is the re-sync method that the dealer does.

davidbijan

I have the same problem in my 2011 E. this thread is useful. Im going to try and resync