You more than likely have a serious pressure air leak in the system. More than likely one or more airbags.
SOURCE: location of fuel pump relay Mercedes 300E 1993
you need to remove the cover behind the battery .
fuel pump relay ( K27 )
I hope this can help you.
SOURCE: How do I change the right rear shock on a 2000
You must go to the dealer workshop for replace shock in your car, after replaced shock in your car must need to re calibrate the airmatic suspension through Mercedes diagnostic CPU otherwise It won't be working properly,
SOURCE: 04 chevy trailblazer air pump not working. what is wrong
Sorry but iam a bit thick this end ,now what are you playing with to stop this pump from working as you havent stated the full facts ,if its not running right with the air pump not working then leave the fuel cap loose a bit so air can enter the tank that will keep the vehicle running while you explain a bit more as to the problem
SOURCE: my air shocks dont work on sil 2000
By not moving I assume you mean lifting and leveling? The good part is all the mechanisms required to make the pump run are working. The part you are having problems with is containing the air.
There should be a Master "dump" valve to allow the air to escape. Sometimes these solenoids freeze. There are also solenoids for each end or wheel to level the car. You have, of course air lines and suspension bags.
If any of these leak, the compressor can not keep up and will run continuously. You have several options. Depends on whether you can fix it yourself. Using a water spray bottle with soapy water, you can wet each air line and suspension bag while the compressor runs. The soapy water will bubble at the leak.
Or you can have a special scanner plugged into the diagnostic port for the suspension. It can "read" the sensors and indicate what is wrong.
Not all places have this type of machine. The Dealer, any GM brand Dealer, can attach this equipment and evaluate the system.
Some repair shops, body shops, may have bought these special scanners. You would have to call around to avoid going to a Dealer.
Since the system is leaking, you will not have to deal with all the pressure that operates these systems. But they can be dangerous and they do support the weight of the car possibly sliding off jacks if the system drops.
I hope my solution is helpful. You may find the parts aftermarket.
The level sensor may have detached. aIf so, reattach it, go into the trunk and find the on/off switch for the suspension and turn it off for a few minutes, then turn it back on. If it is not detached, you will need someone with a scan tool to manually cycle the raise/lower functions
to restore level condition, while looking at sensor readings to see of they are changing accordingly.
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