Having problems with your 1992 Mercedes-Benz Mercedes Benz S Class ?

I own a 1992Mercedes 400se. All the door and trunk locks do not work. Usually, when press down on the drivers door lock, all the other door locks will also go down. Now ever the trunk and gas flaps do not work either. I thought it might be the vacuum pump,under the rear seat, passenger side, the old motor smelled burned, so I replaced it with a new one. I even had to adopt a replacement kit to make the bosch pump work in place of the old Hella pump. Guess what, nothing works: the new

Posted / edited by AnonymousUser on : 10-12-2018

Answers :

Your problem is more than likely a broken wire in \015\012the wiring loom that goes to the driver's side door. Check the loom at the door \015\012hinge.


Also, try checking the pin switch (door \015\012switch) that is either out of adjustment or is faulty.

Another thing, it can also be the vacuum system that locks the trunk the same way the\015\012doors are locked. Maybe the vacuum device that locks the trunk is the\015\012problem.
There should be a clicking in the vac box.
\015\012if you do not hear it clicking then put the old box back on and listen for the clicking if no clicking you will need to check the fuses.check all fuses very carefuly.i have saved people lots of money on repare costs from other techs and turns out the fuse is blown.
\015\012changing out the box also is a problem.
\015\012even with an adapter .
\015\012dont use adapters .
\015\012go to ebay and find the right replacment part.
\015\012on mercedes if theres a bosch part out replace it with a bosch part.
\015\012dont listen to anyone about this i dont care who they are on this one.
\015\012these are setup to run one way only and if you go adding adapters your sure to make changes that are not pleasent or predictable.
\015\012your not talking about a sparkplug or something.if you leave the vac box unplugged the car wont even start.there are computers everywere and all work together. putting the hella is half the problem .
\015\012trusting someone about an adapter or just getting the right part is nothing to concider at all.
\015\012repairs are most of the time very simple to complete.
\015\012check ebay for the pumps
\015\012and take the hella back as its the wrong part.
\015\012also be very carefuly with the vac lines make sure none are or get cracked.
\015\012have someone use the key while you hold the box and listen for the vac box to run or click inside.
\015\012the relay in the vac box should click if indeed the motor is bad.
\015\012[email protected]
\015\012
\015\012keep me posted
\015\012
Repair Help & Product Troubleshooting for 1992 Mercedes-Benz Mercedes Benz S Class

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