I just bought my 1999 S500 and am having problems with the Door-Trunk assist. I've previously owned the W140 chassis S-Class and never had any problems to speak of with this system. The one I just bought worked fine for the first day or two, but I noticed while driving that I had a whistle coming from the drivers side door. When I checked it out, I found that the assist was no longer working, on any doors and the trunk. I pulled the #9 fuse in the trunk to reset and it worked again for a few hours, then stopped again. When I reset the system by pulling the fuse, everything works fine for a few hours, which indicates to me that the pump is fine, but maybe something electronic is going on. Can anybody help me dial in on the problem and possible solution?
Ajohnson

you might have a vacum leak on one of the vacum lines for the doors,, its a speacial tool that detects the leaks at auto zone, pep boys, advance auto parts,  buy that and goo from there.,.

good luck


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A complete discussion of pump and possible repair
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