How is it possible to bypass the pump (A9/1)? Please have a look at the picture.

You can hear the hiss because there is still enough pressure in the system (pressure capsule -> 42).

Please check the cables connected to the compressor. May be something is corroded or broken.

 

I didnt bypass the airpump more of directly give power to the pump through the relay. I learned that from this site: http://www.justanswer.com/mercedes/...com/mercedes/2rrf7-hi-huys-w220-1999-airmatic-not-working-the-car-extremly.html

That makes the pump turn on so the hot cables to the pump do work. The thing im thinking is maybe one of the wires to the relay is bad like the 12v that turns on the hot wires for the pump. That or the ECU I dont know.

 

... The thing im thinking is maybe one of the wires to the relay is bad like the 12v that turns on the hot wires for the pump...

The hot wire for the relay comes directly from the main fuse in passengers footroom. If there should be an fault some other devices in the relay box would not work - so no.

Have a look at the fuse. The fuse is situated in line with the relay. So check voltage at incoming of the fuse while the relay is on or bridged.

 

So I did a test where I see if the pump is getting power with the new relay in by putting a light bulb in where the 40 amp fuse goes to the pump. No light so the pump is not getting power from the relay. Like before I can still bypass the relay using wire and connecting the two prongs, Reply ^^. So from this info it seems like the relay is not activating and its a brand new relay. I was trying to check the fuse that bullet head was talking about but I cant tell which one it is from any of the fuse diagrams. its the fuse for the airmatic relay if it even has one. I need to get a service manual so I can follow the wiring diagram, and suggestions?

 

May be you have a wrong relay or someone with malfunction?


The last time I'd changed the relay the number was A002 542 72 19.

Some fuses have different names depending on date of purchase, but F32 (relaybox) is a good choice. Look also at F9 (engine compartment leftside) and f46 (also relaybox engine compartment rightside).

 

So Ive checked all of the fuses in the driver side compartentment as well as the passenger and the rear passenger seat and still found nothing, fuse 46 is good, cant seem to find 9 anywhere in the diagrams so thats why I checked all of them and still no Luck at making the car try to raise. Its like something is not activating the relay, I guess it could be a short ?!? if the fuses are fine but I would assume they would blow if a short was happening. I ran the pump buy bypassing the relay for a few mins now the airtank has some pressure and it will hiss now and then when I turn off the car and get out but still no movement in any struts.....

 

And where did you get that diagram could you send me the link of the airmaitc schematic with the labels?
Thank you for your help
-Kyle

 

And where did you get that diagram could you send me the link of the airmaitc schematic with the labels? ..

It comes from a link in german language.

http://heckmann1.bplaced.net/mercedes/Ventileinheit%20Niveauregulierung%20Funktion.pdf


You can find fuse #9 in the pic.

 

Your rear struts have failed. The pump won't run because the car is all the way down beyond the limit that the car allows.

You should have changed all of the struts and the suspension parts by now anyway.

 

I just bought the car and it was running fine a few days ago, if the rear had a leak the pump would run until it burn out..... the car to low warning has yet to come on tomorrow ill jack up the rear and see if that stimulates anything,

 

Let me explain my circumstance and you tell me if its the same as yours. When I bought the car, I never heard the pump running. Suddenly the "airmatic low" prompt shows up sporatically. Using my 12v porta pack, I ground out the -ve and touch the positive to the 40amp fuse. I hear the airmatic pump activate. Short across the relay and I hear the pump activate, but regardless of the cabin button position, the car won't rise or turn on the pump.

I succeeded in having DAS interigate. Via DAS, the pump would turn on but here is probably the clue, it would only deliver 8 bars of pressure. Its suppose to be 11 or 12 bars I believe. So my take on it is the computer is shutting it down because it can't deliver the necessary air pressure to lift the vehicle. Time for a new pump I'm afraid as that is what I did, replaced mine with a purchased unit from Arnott. Worked right away.

Your milage may vary, but I'm guessing the pump.

Tower

 

Let me enlighten you. These vehicles have air suspension struts that have a service life of about 10 years or 120k miles. Sometimes a little more, sometimes a little less. When its time to change them, change them all including the suspension pump, filter and relay.

As a dealer selling Mercedes, Volvo and BMW primarily, I will tell you that I typically replace all of these items on a vehicle of that age. I also replace the front suspension components at that time since they tend to share the same service life.

My cost to do a full suspension change on an S-class of this vintage, plus reman air struts all the way around is around $2300 so you should expect to spend close to $3000. There are no short cuts and you can rationalize all day long about fuses, relays, diodes, dashpots, etc. but nothing will repair a leaking air strut except for a new or reman unit. Its like a tire failing. Fine one minute and flat the next.

 

Yea Ill probably order a new pump, maybe mine shit the bed and isnt giving out the nessasary pressure. But that still wont make it work if the raise button doesnt the pump on.... We'll see if the pump magically does the trick!

 

Thank You Tower!

 

Is there any chance that the rear height sensor link has failed? and the car does not know its rear is collapsed? That would be an easy fix? If you think the aircompressor has failed, try lifting the front corner with a trolley jack the opposite side should rise with it suggesting the pump is supposed to be off because it has adaquate stored compressed air in its tank. Lets us know how you resolve this issue.

 

Hi. Been having some difficulties w mt air ride syatem as well, where the compressor just stopped kicking on at all after a little bump in the front of the car,. Wondering what you finally did in regaurds to the compressor and getting it up and running again? Thank you!! Scot

 

Maybe the cables which go to the compressor got damaged. Mine had similar problem and it turned out something had spliced one of the cables.

 

Hi were you able to sort your what was your problem i have changed compressor relay and front shock that had a leak car was working fine then next morning wouldn't raise i can bridge relay pump comes on but car won't raise that way. It needs to come on on its own but it wont only if I bridge the relay I hear pump.

 

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Really ? Posted 2014 ? Member last seen May 2016 ?