Question about 2000 Mercedes-Benz S-Class
Your problem is most likely a broken door lock assembly. The closing assist actuators work with vacuum/pressure from the PSE pump and they break. The usual point of failure is the locks that hold the actuator together. You may try to find a way to reassemble the actuator, but the best fix is to replace the door lock assembly. Unfortunately MB does not make individual repair parts available for these cars.
Posted on Dec 15, 2014
Hi,never had this problem myself but you are right they do work on a vacuum pump,so it could be possible that the pump that contoles the lock could be forty or it could be that the air lines that go from pump to the lock could be leeking so ther is not enuff pressure to make the lock work,find the pump(wich on my clk is in the boot, as you look in it will behind the lining on the right hand side)and take the air line off one of the connectors that you know works one of the doors and swop it over to one that you know is not working,if now the other one works the pump must be the problem,if not you will have to take the door cards off the locks that dont work and check that there is presure at that end of the air lines.hope this helped a bit,best of luck.
Posted on Dec 15, 2014
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Posted on Jan 02, 2017
SOURCE: Brake lights stay on
Your brake light switch is stuck on, this is also why the cruise is in-op, the cruise is turned off anytime you touch the brake pedal otherwise the car would try to accelerate when you tried braking. The brake light switch is located above the brake pedal, look up the arm the pedal is attached to and you will see it, the switch is not real expensive, and it is easy to install with simple hand tools. As far as the door lock issue fix the brake light switch and try it, not sure it is related unless it all started at the time the brake lights started staying on. Post back after you replace the switch if door problem remains. Thanks
Posted on Aug 06, 2008
Trunk can be lock separate from the doors valet try unlocking the trunk with the key lock it with the door.Read the owner manual it will tell you about valet parking.
Posted on May 20, 2009
There are 2 pneumatic pumps in your vehicle. one is vacuum and is for your central locking, located under your rear seat bench. The other is pressure and is called your closing assist pump. It is in the trunk behind the rear liner. It also operates you reverse antennas(optional). Your doors and trunk lid are closed by pressure valves that work like little teeter totters. There is an updated relay called a convenience relay located in the right side of the trunk. It stores all the window paramers(for express up and down) as well as your closing assist parameters. In the right side of the trunk there is a fuse box. If you remove the closing assist fuse( I beleive it is # 15) for 15 seconds and then reinstall it, the parameters for your closing assist will be reset. It is possible that your vehicle already has the updated relay(called a relay but actually a microprocessor) and there is a leak in the system. After reinstalling the fuse you can see what doesn't work( one of the doors or trunk,reverse antenna) and isolate the faulty component. If everything works o.k. let it be because they have always been problematic and when they happen to fail just reset it. hopefully I have been helpful.
Posted on Jul 15, 2009
did you recently have a dead battery? Either way try to resynchronize your windows (i'm not sure if you meant front window or rear quarter window). If you hold the window switch in the up position(car running and door closed) untill window reaches the top and continue to hold for 10 seconds the window will reprogram itself. try both front windows. This system is complicated and is best diagnosed via s.d.s. diagnostic machine. I will give you a couple of other possible easy remedies. If your vehicle is equiped with a ski window in the rear trunk panal the door must be shut, also your cargo cover must be shut and plastic lid secured. There are numerous micro switches that input to your soft top control unit-any one could cause the top to be inop. Check to make sure the switch on the cargo cover( retractable cover in trunk) is secured to it's housing, they do periodically fall off. Also if your roll bar ( rear head rests ) has been mechanically deployed You must hold the switch in the up position untill the rams lock back into the roll bar-does the roll bar operate? Always operate top with vehicle running because they are very voltage dependent. Your owners manual will explain how to manually raise top and some simple operation and repair remedies. If you are knowledgable about automotive electrical systems you can disconnect both leads from the battery and touch them together to drain the capacitors and it may reset the module( do not attempt if you are not knowledgable with automotive electricity because there are many things that can go wrong. hopefully I have been helpful.
Posted on Jul 25, 2009
you have to replace door lock completely , there is small plastic gear on electric motor which moves locking mechanism and seems that gear is broken, but it is not available as separate part.
Posted on Nov 03, 2009
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