Door closer (microswitch)
Thread Starter
Newbie
Joined: Jan 2004
Posts: 6
Likes: 0
1994 S420
Door closer (microswitch)
Does anyone have any experience with these? I'm talking about the microswitches that when triggered, pull the doors closed with the vacuum assist. I have had my driver's door apart to get a look at it and from ALLDATA.com have a good handle on the procedure to replace one. BUT.....The first time I got in to this area was two months ago when the driver door failed to pull itself closed. That's why I looked inside. Found out it was likely the microswitch as the culprit. I have not yet replaced it, and a week ago, the fron passenger door stopped pulling itself closed too! 
This morning, I had the car parked in a heated garage...put something in the back right side...door closed itself fine. Pulled it outside, and had to get in back right door again. Now it does not pull itself closed. Then immediately went to trunk to check and it had stopped pulling itself closed. 
The only one to still remain working is the left rear door. WHAT"S GOING ON!!!??? Are they beginning to fail in series? Does one fail after the other if another is bad? PLease help before I go mad, or install new microswitches without needing to.
Thanks,
2kprwlr
This morning, I had the car parked in a heated garage...put something in the back right side...door closed itself fine. Pulled it outside, and had to get in back right door again. Now it does not pull itself closed. Then immediately went to trunk to check and it had stopped pulling itself closed. The only one to still remain working is the left rear door. WHAT"S GOING ON!!!??? Are they beginning to fail in series? Does one fail after the other if another is bad? PLease help before I go mad, or install new microswitches without needing to.Thanks,
2kprwlr
Senior Member
Joined: Jul 2003
Posts: 455
Likes: 1
From: Fl
92 500sel/01 320e wag
Closing assist
The microswitches rarely fail, the "pump" is very common, $500-700 if you managed to get the door panel off you are qualified to replace pump. Remove both liners gas tank & rear wheel housing (driver side) it sits up on the wheel housing next to the gas tank. if you have a handheld vacuum tester you can check to see if any hoses or actuators leak. If the problem moves around or can be fixed by removing fuse 9&10, you have the answer (pump).
http://benzworld.org/ search on this site under "closing assist" 140 forum
http://benzworld.org/ search on this site under "closing assist" 140 forum
