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C32 2002 Gl4502007 1997s600
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206 Posts
Discussion Starter #1
been getting a lot of responses to m problem with my 1998 c280 mercedes benz. I think the problems is the k40 relay module. is this a dealer only part? I checked all the fuzes in the glove compartment. All of a sudden last month, my windows, my trunk, my sunroof, my directionals wont work. The trunk wont work manually with the key either. I figure from all the reading i have done, the problem is the k40 relay. changing this out, some people say only takes 10 minutes. has anyone else had to change the k40 relay?
 

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'99 2.3L Kompressor
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1,944 Posts
Good discussion about the relay:

http://www.benzworld.org/forums/r170-slk-class/1263021-k40-relay-circuit-associated.html?highlight=k40+relay

The thing is that I believe the location is different on the R170 roadster. Here is a picture of the relay installed. Look at the white drawing of the car and the red circle. I believe that is where you will find it on a sedan vs. a roadster:

http://www.classic-roadster.de/cgi-bin/showitemlocation.cgi?TYPE=R170&X=8&Y=6&SORT=ITEM&START=K&ITEM=K40

On the w202 with left hand steering, I believe this box is in the engine compartment on the passenger side right up against the back wall. I say this because that looks like the 38 pin diagnostic port at the front of that box. You will have to take the big black cover off to access the internals.
 

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C32 2002 Gl4502007 1997s600
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206 Posts
Discussion Starter #3
do you think repalcing the k40 relay will fix all my electrical problems that I am having with my car?
 
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