It must be a relay somewhere. I have a 1998 210 diesel. Suddenly right brake light stops working. Bulb is good. Seemingly at the same time, the driver window and seat stops working. The next day, brake light still not working, but now the passenger side seat and window not working, and driver's side is fine again. Any help is greatly appreciated!

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1998 E300D, 287k, barely broken in.

all the functions you mention are on the CAN BUS network in the car, there is a connector called the X30 (I beleive) - its a junction block for the CAN.

My experience was working on a W210 that would lose the passenger front window control. After removing the seats and carpets I found that connector and it was wet and had poor contact.

It may also be a window motor in a door going bad - it can take down other doors too.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Yep the body CAN junction is below the door sill on the front passenger side. Pop off the door sill carefully and peel back the carpet. It looks like a harmonica with a bunch of two pin connectors on it.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Thanks guys - will check it out and report back.

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1998 E300D, 287k, barely broken in.