99 (w140) s500 trunk door will not fully shut
#1
99 (w140) s500 trunk door will not fully shut
When I close my trunk door it will not fully shut. I would have to take the fuse out and put it back in for It to fully close.
The following users liked this post:
Drews s500 (05-12-2020)
#3
Member
The trunk requires the vacuum operated soft close system to fully shut. The control computer for the electric vacuum pump will disable the pump if it fails to build the right vacuum pressure within a set amount of time. This is generally caused by a leak, either in a vacuum actuator, or an air line. Pulling the fuse and reinstalling it will temporarily reset the vacuum pump, allowing it to function (at a reduced strength) despite the leak, but doing this repeatedly will burn out the pump. You need to find the air leak and fix it so that the pump doesn't time out.
The following users liked this post:
Drews s500 (05-12-2020)
#4
Newbie
Join Date: Feb 2015
Location: Curitiba
Posts: 3
Received 0 Likes
on
0 Posts
W116, C124, W126, C219
The trunk requires the vacuum operated soft close system to fully shut. The control computer for the electric vacuum pump will disable the pump if it fails to build the right vacuum pressure within a set amount of time. This is generally caused by a leak, either in a vacuum actuator, or an air line. Pulling the fuse and reinstalling it will temporarily reset the vacuum pump, allowing it to function (at a reduced strength) despite the leak, but doing this repeatedly will burn out the pump. You need to find the air leak and fix it so that the pump doesn't time out.
#5
Senior Member
I can hear an air leak on the latch side.