Door Closing Assist Easy fix, W140 S class - PeachParts Mercedes-Benz Forum

thatsdax · #1 03-06-2009, 08:38 PM

I have a First Year W140 S class with Door Closing Aid. I had some problems with my closing aid but it is now fixed and working properly. I bought a plug and play circuit and in minutes my doors are working perfectly again. Cost was cheap. I would tell you where you can get this circuit to help those with similar problems, but I do not want to advertise or be accused of advertising in the room and have this post pulled. I only want to help those that have closing aid problems as I had. I dreamed of a day some one would come up with a fix for this problem.. And some one has...

A. Rosich · #2 03-07-2009, 01:35 AM

The ONLY easy fix on failing closing aid systems on the S-class is usually a brand new pump, and even that does not guarantee a permanent fix, as some brand new pumps tend to fail suddenly again.

Most of the fixes I have seen advertised are usually temporary fixes.

The closing aid system, as with most systems fitted to the W140 are just overly designed and overly complex, which is what makes this car so beautiful.

wbain5280 · #3 03-07-2009, 02:19 AM

There are tons of posts on fixing that system. Like this one:

http://v12uberalles.com/Closing_Assist_Pump.htm

Peter Guenther · #4 03-07-2009, 08:06 AM

Almost the victim of a 3rd pump, I followed the instructions, and it has been over three years without a hitch. The guys at MB confirmed that the pressure switch is the culprit sometimes, but overadjusting it could cause havok with the other elements. They also confided that NB wont let them open the pump or tweek it for liability issues.
If you look at it it has safeties, purges the lines of moisture, resets the elements.

thatsdax · #5 03-07-2009, 01:37 PM

I know it sounds hard to beleive.. But.. Really..This is an easy fix.. This is a circuit that simply resets closing aid system a pre determined time every time after the car is started. Simple.. And it works beautifully.. No need to replace anything for any reason..

thatsdax · #6 03-10-2009, 01:39 AM

I have had mine working for almost 2 months now. It works flawlessly. Perfect!! Enjoy the ride....

Brett San Diego · #7 03-14-2009, 05:01 PM

Quote:

Originally Posted by A. Rosich

The ONLY easy fix on failing closing aid systems on the S-class is usually a brand new pump, and even that does not guarantee a permanent fix, as some brand new pumps tend to fail suddenly again.

Most of the fixes I have seen advertised are usually temporary fixes.

I beg to differ. My system has run for 5 years without a single failure to close a door since performing the shut-off pressure switch adjustment. I would place adjusting the switch in the "easy" category, especially with the detailed instructions available.

Brett

thatsdax · #8 03-17-2009, 04:55 PM

My Dad had , "had" the 1995 S500. He owned it for a few months when the door would not close with assist. Then the trunk. He took it to Mercedes of Littleton. They replaced the pump.. Well over 1000 dollars with install. They gave it back. After a week or so, the door would not close with assist. He took it back, again.. Provided a loaner car and in the next week and another 1000 dollars or so, gave the car back fixed.. So they said.. This time they replaced the lines and did some other stuff. After a few weeks, again.. The door and trunk would not close with assist. The car went back into the shop and again, provided my dad with a loaner. IT was one of the 4 cylinder mercedes with a super charger. My dad did not like this little loaner car and wanted his beloved S500 back fixed. Mercedes of Littleton did everything they could to make it happen. This time however, they flew mercedes Engineers from NYC to Mercedes of Littleton to fix this car.. After several weeks, the car was deemed fixed.. After a week or so, again.. The drivers door would not close with assist. At this point, Mercedes showed my dad what fuse to pull to reset this system back to normal when and if it quit working. So.. All in all. After several thousands of dollars and Mercedes Engineers flying in to find the solution.. Well.. Back to ground Zero.. Needless to say.. MY dad was really put out having to pull a fuse every few weeks when and if the door closing aid system quit working. And..The reasons for this to quit are too numerous to mention in this thread.. As it turns out, my dad got really angry with all this and took the car back to Mercedes one last time. And told them to fix it, or refund his money. They swore they would get it fixed.. Wow !! So.. when they called this time and said.. It is fixed.. MY dad said.. Well.. My problem and your problem will soon be someone elses problem. I am getting rid of this car. He had mercedes put in writing the car was fixed and in sound condition and then he got rid of the car.. All because of the anoying door closing aid issue. No kidding.. And this problem is not uncommon. I saw a guy with an S320. He slamed his door as you would any car door. I checked with him and he said his car never had the door assist. He bought it used and it came with out it. Well. He was wrong. I checked with mercedes and it came with it. It just has never worked for the guy and he never knew any better. Just slam the door.. Ignorace is bliss. Also..I was at fedex drop off when a guy pulled in with his new, new at the time, 2002 mercedes S class. I noticed he got out and slamed his door shut. I thought.. Humm.. I guess mercedes got away from closing aid.. When I walked into Fedex behind him and into the line.. I mentioned to him that I noticed he closed the door normally and that I guess mercedes got away from closing aid. He said.. No they did not.. And that his closing aid on his new 2002 mercedes quit working so now he has to slam the door as you would any car.. He was bummed about it. I remember this and this was several years ago.. I think 2003 or 2004.. His car was fairly new at the time.. And already his doors quit. I do know that barametric pressure has a big effect on the closing aid. We are high up here at 6000 feet or so. And it is nothing but up from here. You can drive up to over 14,000 feet here. 10,000 to 11,000 feet is a common drive here. And then your doors quit working. AT any rate. There is a fix for this problem. It is electronic and plug and play.. IT is wonderful to have the doors work all the time as engineered. MY dad now wants to buy another S class now that this fix exsists. Thanks..

deanyel · #9 03-17-2009, 05:12 PM

Some S320s have it, other don't. My 1995 SWB does not have it, never did. I consider its absence a big plus for the car, along with all the other things it does not have. S500s, like 6.3, like 6.9s, etc. just don't age very well.

syljua · #10 03-18-2009, 06:42 AM

Quote:

Originally Posted by thatsdax

There is a fix for this problem. It is electronic and plug and play.. IT is wonderful to have the doors work all the time as engineered.

You go to great lengths to get you precious gizmo selling... Kind
of admirable, but nevertheless, you fail to explain in what sense
a pump will fail later with you gizmo, that with pulling the fuse...
And as we all know, pulling the fuse, is not what Mercedes engineered.

Properly adjusted pump, will have plenty of room left for
variation in air pressure, both regarding altitude and/or weather.

By all means, sell it to your dad!

syljua

thatsdax · #11 03-24-2009, 09:11 PM

Already have.. And.. Mercedes is knocking on my door for more of them as well.. Thanks...

locry · #12 03-12-2009, 02:35 AM

lemme guess... the plug and play thingy simple resets everything every time the circuit is triggered.

syljua · #13 03-12-2009, 06:21 AM

locry, spot on! And that approach will still let the pump run for 10s until it times out.
And it is the prolonged running thats killing the pump. So, I for one, would not
recommend this solution at all.

br,
syljua, with a properly adjusted pump...

syljua · #14 03-12-2009, 06:51 AM

...and looks like you DO have an interest in this economically;
1992 300SE Doors

Quote:

I have a closing aid fix. I have a copyright for the circuit design and patent pending . This is an inexpensive fix and Mercedes is interested in buying my little circuit for all their S class Mercedes with Closing aid.

Yeah, right, Mercedes would buy this...

not so best regards,
syljua

thatsdax · #15 03-12-2009, 12:38 PM

Yes. I am the engineer that designed the circuit. It is a timing circuit that manipulates voltages to certain components at specified times during steady state conditions. Timing, voltage apertures, and steady state values I will not discuss, also, I will not go into the RC time constants and Vcc values or Time allowed for Steady State . Those are all engineering parameters that mean nothing to those with door closing aid Issues or problems. This is not a fix for everyone with closing aid problem.. But it is for most. . Circuit design is copyrighted and there is Patent pending on the physical aspects. It works beautiful. I am excited that there is a fix for the closing aid. But.. You guys can do as you wish . I am trying to help and let those know with closing aid that there is a fix. This is exciting for those that have this closing aid problem. At any rate.. If there is anyone with a door closing aid issue and need help, you can IM me or contact Star Tech Mercedes in Denver. There.. Done.. I hope those that need help see this before the post is pulled. I am sure that is the objective is to pull the post. You guys or site owners should have a swap and shop section then for posting services and products for sale or trade.. That is.. If you really want to help those with mercedes.. Just a thought.. Thanks.. Enjoy the ride..