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  #1  
Old 12-05-2005, 03:41 PM
STILL FOND OF 82 300SDs
 
Join Date: Jul 2005
Location: Temecula/Murrieta California
Posts: 18
Red face Just Does Not Seem To Be My Month! 140 Auto Assist Door Closer

Well the front passenger door decided not to auto close anymore. The rest of the doors work wonderful but for some reason this one stopped.

I am hoping somone may have an idea on what to do? Replace the unit? I just dont know where to start. Any help would be much appreciated.

1995 s320
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  #2  
Old 12-05-2005, 04:58 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
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Question

if you remove fuse # 9 in the TRUNK for 10 seconds will that (closing assist) start working again?
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  #3  
Old 12-05-2005, 05:12 PM
STILL FOND OF 82 300SDs
 
Join Date: Jul 2005
Location: Temecula/Murrieta California
Posts: 18
Red face That worked!!! Thank you! ?BUT?

Thank you very much but I really dont get it?

All the other doors worked perfectly, I pulled that fuse like you said and all was fine. The trunk was out of whack then but I reset it again and it was fine.

Is the pump going bad? Or does that door leak vacuum and the pump turns that section off after time?

Sorry for all the questions, wondeful fix, but I would love to undertsand it.

Thank you again!!
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  #4  
Old 12-05-2005, 05:53 PM
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Join Date: Jan 2003
Location: Florida
Posts: 1,084
Its one of those 140 things, the circuit is designed to shut of after three tries based on the timing parameters. If you pull the fuse it resets it, this will probably result in a increase of your mean time failures, untill you replace the $$$ pump. Ther are two schools of thought. One is that the locks get stiff over age causing the failure inthe time allocated. I respect that since it could affect the timing, mine is that MB desinged it too close. I am on the third in 14 years, 96, 00, and 92, plus and minus they good willed it the last time. There were no other changes other than the trunk handle re-route in 96 and no leaks.
There have been people on various forums that have messed with the pump adjustments, no brass ring yet.
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  #5  
Old 12-05-2005, 06:40 PM
STILL FOND OF 82 300SDs
 
Join Date: Jul 2005
Location: Temecula/Murrieta California
Posts: 18
Talking Just So I Understand Correctly

The pump can be shut down on certain individual areas, such as the front passenger door, rear trunk etc. Its not that the pump completely shuts down and all items dont work but individual items?

Can this be correct???

Is this the pump under the rear passenger seat??

Thank you
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  #6  
Old 12-06-2005, 12:40 AM
A. Rosich's Avatar
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Join Date: Nov 1999
Posts: 883
Once the servo assist stops working on one or more doors it signals that the pump is out of comission. It will do it only in one door, alternate between various doors or the trunk. Usually the pump controls all doors and the trunk through independent vacuum lines, although I don't think they can independently be turned off for a certain door.

The #9 fuse reset will help for a very SHORT while, but be prepared to change the pump sooner than later.

The servo assist pump for the doors and trunk is located on the trunk, driver's side, behind the upright panel just under the speakers. The pump under the rear seats controls the power locks and the lumbar support on seats. Completely different pump. Both pumps are expensive to replace $$$.

As mentioned, many forums have tailored with the idea of adjusting the pumps, although it seems the only real way to solve the problem is a new pump. Good luck!
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