just wondering if anyone has had a similar issue with their windows. or if anyone knows where to start trouble shooting.
the drivers front and the passengers rear windows stopped working on the same day. theres not a sound, not a click, nothing. just not working. i checked all the fuses and they are all fine.
any ideas? hopefully other than starting to check vaccum pots?

__________________
1980 300D

Diametrically opposite windows are on a common fuse. You might try replacing the fuse; appearances can be deceiving.

Checking the vacuum system won't help.

Fuse, even if it looks OK, pull and replace. Actually replace all with copper fuses.

Attached Thumbnails

 

__________________
83 SD

84 CD

My vote is fuses too. They can look fine and be bad at the same time.

__________________
DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

Ijust had the exact same issue, my switches have been acting up lately but i decided to check the fuses. when i opened the fuse "lid" the fuse looked intact but was infact kindof "bubbly" in the middle and the connection was broken. Even though from a distance it looked fine.

It's the fuse. My windows did the same thing. The fuse looked fine but had a bare ring where it makes its connection. You should put all new fuses in. It is very inexpensive. At minimum, buy a supply and keep them in the car.

__________________
85 300D 75K Anthracite Grey 0-60 in 13 seconds **For Sale**
84 300D 333K Black (The Velveteen Rabbit) 0-60 in 14 seconds
00 Toyota Sienna 208K (Sold)
15 Subaru Outback 43K
11 Subaru Outback 67K
98 Ford Taurus 100K (Gertie - Was Grandma's - drove it to church and shopping - really) Daughter's car now.
30 Model A Ford 2 Door Sedan (Sold) 0-60 in . . . Never reached 60

thanks guys for the replies but its honestly not the fuses. i didnt just look at them for checking. i checked for continuity across them. actually all of my fuses while i was in there. any other ideas? seriously its not a bad fuse. im lost.

__________________
1980 300D

I suggest you take some fine grit emery cloth to the contact point at both ends of the block where the fuse contacts, and maybe swap fuses with the other window group (just for fun). Often the Al fuse with the Cu block leads to corrosion.

(I would still recommend replacing the fuse)

__________________
83 300d - 390k

Isn't there a relay for the windows? Or is it a direct system? I thought there was a relay in the fuse box that controlled the windows.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

If the malfunctioned windows are across from each other then it's almost certain a bad fuse.

__________________
DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

1980 300D - Opposite windows are ganged on a common circuit...Most likely the fuse...sometimes the "corrosion" is simply a dull looking finish or patina on the contact points of the fuse and/or the fuseblock contacts. For my spring cleaning routine I use a Qtip with the emery/crocus cloth wrapped over it to
"polish" the fuseblock contacts...works great. Also inspect and clean the seal on the fusebox cover and lightly apply rubber lubricant to keep the seal pliable.

__________________
Bama1


2008 SLK 280, Firemist Red - "Hurricane"
2001 F150 Lariat 4x4, Black on Black - "Badboy"
1982 240D 4 speed survivor -"Pearl" - Donated to Vietnam Veterans
1962 Oldsmobile Dynamic 88 -"Gertrude"

1954 model original owner - ~2.5M
Gray softtop/solid exterior/modified chassis

No, there are no relays for the windows. There aren't any relays in the fuse box whatsoever.

Has to be a fuse or a broken wire.

when I brought my car to florida the humidity played heck with the fuses. I took all of them out and wire brushed the terminals in the box and replaced them with new ones from MB. used a lot of dielectric grease too. this fixed a lot of intermittant and bothersome issues with one pass, including the passenger front driver rear window issues I was having

also, if you recently replaced or removed your window switches, it is wery easy to get them connected wrong. The plugs will go on in many different combinations resulting in some windows not working or blown fuses....

__________________

1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)

Replace the fuses first.

The power windows on a MB are wired so that L/F and R/R are fused together and R/F and L/R are fused together.