Whilst considering battery and then windows reset I’d fully charge (and ideally measure) the battery.

Windows will not work without sufficient power.

Older batteries charge but do not hold the charge.

 

Passenger window works fine. Only driver window is an issue, so I don't think it is battery.

 

And if that does not fix scan for DCM
They don’t like water if it’s been kept outside.

Ideally with SDS, but most scanners should find and report DCM.

 

I have a cheap scanner for my truck (not MB). I don't think that one will work. Reading up at MercedesMedic right now about SDS and alternatives.

 

SOLVED! I disconnected the battery, waiting for 30-45 minutes, reconnected the battery. I then went to try the Window Reset. All worked like it was supposed to. Windows now working the way they always have.

 

Now that the windows work again, I can put the top down and lubricate the seals and I can enjoy this wonderful weather before it gets too hot.

 

Marked as Resolved but if this same issue returns, come back to this thread (do NOT create a new one) and we will update accordingly.

BTW, you are allowed to edit your own posts (no need to create a new one to include something you forgot in your first )

 

Hi all,

I'm having what seems like exactly the same problem, except it hasn't fixed itself (and it's happening on the passenger side). I've messed around with it quite a bit:

• I've done the window reset procedure (without opening the passenger door, because if I do that, the window won't move), that is, open the window all the way with the button half pressed, wait a few seconds then close it all the way and hold it for a few seconds. The window moved as expected, however afterwards it wouldn't move.
• If I disconnect and reconnect the battery, I can open the window once, immediately.
• If I don't close the window fully, I can move it up and down as much as I want
• If the passenger door is open, it also gets stuck at the bottom, until reset.

I took the door card off to see if I could see anything obviously wrong. I've disconnected and reconnected all the connectors multiple times, and discovered that if I unplug, wait 10 seconds and replug the bottom right one (bottom, front), that's equivalent to disconnecting and reconnecting the battery and it works again for one go.

Having put it all back together again, the car now seems to have decided that "up" is slightly below fully up, which means there's a gap at the top of the window when the door is closed. I think if I have the window module in the reset state, if I open the door, it will drop a bit, and then go back up to the slight gap when I close the door.

After resetting the window module (by unplugging and replugging) I can do any one of the following, but only one, and only once:

• Have the window open and close as expected when the door is opened.
• Open the window, move it around as much as I want until I close it
• Put the roof down (because the window has to drop slightly and then go back up)
• Put the roof up

{edit} I've thought of another detail that could be worth mentioning. When I press the window switches, I can hear the relays clicking inside the door - there's a click when I press the button and then another click a couple of seconds later. So, the signal is definitely getting to the control module and maybe it's trying to power the motor, but that seems unlikely since the window doesn't move until reset. {/edit}

My suspicion is that the window control module has failed or whatever detects the window position isn't working properly, but I would appreciate any insight anyone can give me! I don't have an MB scanner, but I do have an OBD2 reader. I also have a voltmeter, so I could check for signals on various wires. I'm planning to sell the car soon, and so would like to get everything working before I do so, and I think this is the last thing on the list.

Thanks for your help! Please let me know if there's anything I should try, or if you need any more information. The car is a UK spec 2005 R171 SLK280.