Question about 1999 Mercedes-Benz S-Class

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I have a 1999 Mercedes S320, Do you know how the trunk and doors will automatically compress when you close them. For example when I close my trunk it is suppose to compress tightly once I manually close it. However my trunk and doors have both stop doing this. Is this a fuse problem? I think the feature is called pneumatic doors and trunk closing assist! Help please!

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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

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Yes this is a fuse problem

Posted on Jul 14, 2009

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