E320 Central locking
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Newbie
Joined: Jul 2022
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E320 1996
E320 Central locking
I'm sure this has been discussed a lot. But I would like some guidance. I have an E320 (W210) 1996.
My central locking stopped working several months ago. All fuses are good. The key fob engages the PSE pump under the seat, but no action with the locks up or down. The security system engages and also lights up when using the remote. The door locks dash switch and the trunk switch do not engage the PSE pump (nothing happens). Here is one clue: if I manually lock the doors and inject compressed air, one of the rear doors does not go up. I have not as yet tried to test the lines under vacuum. All the locks are tied together (6 yellow lines). There is a gray air line and a white air line. I believe one of them goes to the engine vacuum lines. Before I order a pump replacement, it would be good to get some ideas.
TNX
Peter
My central locking stopped working several months ago. All fuses are good. The key fob engages the PSE pump under the seat, but no action with the locks up or down. The security system engages and also lights up when using the remote. The door locks dash switch and the trunk switch do not engage the PSE pump (nothing happens). Here is one clue: if I manually lock the doors and inject compressed air, one of the rear doors does not go up. I have not as yet tried to test the lines under vacuum. All the locks are tied together (6 yellow lines). There is a gray air line and a white air line. I believe one of them goes to the engine vacuum lines. Before I order a pump replacement, it would be good to get some ideas.
TNX
Peter
Thread Starter
Newbie
Joined: Jul 2022
Posts: 5
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E320 1996
OK...well frankly I did not join this forum (yesterday) to be told to go to someone else for diagnostic help. Replacement pumps are not that expensive and are easy to replace. The other issue is the only MB shop in this area that I trusted, closed (they retired). So I need to do what I can until I find a new service shop around here.
MBWorld Fanatic!
Joined: Jan 2004
Posts: 5,939
Likes: 178
From: Seattle WA
99 E320
if you buy a replacement pump, new or used, you may still need an MB diagnostic tool to reset the PSE pump to ensure that it handshakes with the proper appliances.
generally positive pressure handles unlocking while negative pressure (vacuum) performs locking. the air hoses become brittle over time and by now, we're talking about 20+ year old plastic hoses. They tend to fracture first at the end and T connectors....or at a location near a hinge (flexing back and forth)
generally positive pressure handles unlocking while negative pressure (vacuum) performs locking. the air hoses become brittle over time and by now, we're talking about 20+ year old plastic hoses. They tend to fracture first at the end and T connectors....or at a location near a hinge (flexing back and forth)
Thread Starter
Newbie
Joined: Jul 2022
Posts: 5
Likes: 1
E320 1996
Fixed it. Found the leak, a mouse had eaten into the air line to the left rear door. Fortunately it was in a spot I could get to. I spliced the line and tested the vacuum (with new hand pump)...all was good. I used the method mentioned in another topic or forum: used a spray can nozzle extender to join the pieces and used .170 ID rubber hose over it, all set with superglue. Locks are back to normal.
TNX for the help for those who posted.
Peter
TNX for the help for those who posted.
Peter
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MBWorld Fanatic!
Joined: Jan 2004
Posts: 5,939
Likes: 178
From: Seattle WA
99 E320
Another fix for a leak to consider would be the
which is self sealing. Stretches and seals wonderfully and I always keep extra rolls around the garage for misc fixes
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