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S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

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Old 06-28-2007, 09:12 PM   #1
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Soft Close Is Gone! Helppp

my drivers side door and passengers rear dont do the soft close anymore when you close the doors. HELP...
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Old 06-28-2007, 09:15 PM   #2
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central locking vacuum supply pump ...i think thats wat its called
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Old 06-29-2007, 08:04 AM   #3
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This should answer your questions
http://v12uberalles.com/
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Old 06-29-2007, 12:53 PM   #4
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Also - one finding from times when my closing at on of my doors was not working as it should (question of a microswitch - that I described earlier; and not the pump).

If the door in question was the last one to be shut, and the window was fully up, probably the pressure inside the car was prohibitinig the whole door, and subsequently the switch, to get to a position where it was able to initiate the sucking (send a proper signal to the pump) and in most cases no action was initiated.

If, during closing of the door in question, any other door was left open, or the window of the "questionned" door was at a bit down, the in-the-car pressure was not there (I imagine) and the sucking worked OK (the door was able to get to a position where the switch was able to send a signal). It seems that the switch was working improperly and not able to engage at this "slighly earlier position".

And obviously the most used door are prone to this failure. Nothing to do with the pump.
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Old 06-30-2007, 01:04 PM   #5
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The microswitch is not a common failure, the pump pressure sensor and motor are, read article on v12 posted above, The fastest test is fuse #9.
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Old 06-30-2007, 09:21 PM   #6
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Thanks for the plug Peter.

Here is a direct link to our friend Brett's excellent article...

http://v12uberalles.com/Closing_Assist_Pump.htm
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Old 07-05-2007, 11:52 AM   #7
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I have a similar issue where my soft close doors and trunk were not working. So I was told that I have to cycle a certain fuse in the trunk fuse box. Everytime I take the fuse out and put it back in, the system works once, and then halts again. Will following the v12 article help me to fix this once and for all, or is my case different?
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Old 07-05-2007, 03:35 PM   #8
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I have a similar issue where my soft close doors and trunk were not working. So I was told that I have to cycle a certain fuse in the trunk fuse box. Everytime I take the fuse out and put it back in, the system works once, and then halts again. Will following the v12 article help me to fix this once and for all, or is my case different?
Mine is a W220 .. but had the same problem. I kept changing the fuse on mine for a few months .. then it finally went and would just blow the fuse as i put it in. If you need to keep changing the fuse, it probably means the pump is on the way out.
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Old 07-05-2007, 03:35 PM   #9
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I have a similar issue where my soft close doors and trunk were not working. So I was told that I have to cycle a certain fuse in the trunk fuse box. Everytime I take the fuse out and put it back in, the system works once, and then halts again. Will following the v12 article help me to fix this once and for all, or is my case different?
It will probably solve it!
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Old 07-09-2007, 06:51 PM   #10
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I have a similar issue where my soft close doors and trunk were not working. So I was told that I have to cycle a certain fuse in the trunk fuse box. Everytime I take the fuse out and put it back in, the system works once, and then halts again. Will following the v12 article help me to fix this once and for all, or is my case different?
I make no guarantees, but it can't hurt to try. You need to do some diagnostics first, which I describe in the article on v12uberalles.com. There are many possibilities for failure of the system.

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Old 04-25-2014, 04:24 PM   #11
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The V12 article appears to have gone too! :-(
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Old 04-25-2014, 04:24 PM
 
 
 
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2004, 95, close, closing, closure, door, doors, fuse, lexus, ls430, mercedes, pump, repair, s320, s500, soft, w211



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