randjoy

I've just replaces the trunk latch assembly in my 2003 SL55amg but still don't get the soft close. Is there a reset button or something that needs to be done before the soft close will operate again?

next2pool

The easiest way is to disconnect the rear or trunk battery for a few seconds and reconnect it. The pump will then rest.

Garrym

I have a 2004 SL500 and the soft close trunk mechanism stopped working. I disengaged the battery then reconnected and it worked for a short time then stopped again. I also removed the lock assembly and glued all the ball bearing ports with no visible signs of assembly housing split, reinstalled and stills stops working after a short time.

I then bought a brand new assembly. It worked for about a week and now it has stopped working. Is there anything else that could be causing the problem.

Please help.

Jan T

Maybe something keeps blowing a fuse or something electrical? I only mention it because when mine had closing issues that one time, I also noticed my trunk light was out too. But when I disconnected and reconnected the battery, all has been fine now for a few weeks with light working and trunk closing.

Garrym

Jan T: Thanks for your help. I dont think that is the problem because I never had to replace fuses and my trunk light still works, its just that the soft close doesnt. Thanks again.

cyglee

Garrym: check air tubes connections to latch inlets? There may be a seal(s) leaking. Any burrs on latch inlets? It seems to be a slow air leak causing PSE pump to time out. I had to reinstall my epoxy repaired latch after the first attempt, but all has been good since.

Garrym

Cygee: Thanks for your suggestion. I will do as you said and will keep you posted.

techeddan

I have a mercede benz 500sl and I cannot open the trunk. Do you have any suggestions?


Techeddan

rover75golf

My trunk would not open automatically but I managed to open it with the Key in the fob ? Since then its been ok . Sorry that's the best I can advise but there are a lot of answers on the R230 Forum

techeddan

how did you manage to open the trunk with key?

rover75golf

On the main key fob there is a master key , just slide key out of fob and use it to open the trunk. The key goes into the slot next to the number plate lights , next to the pull handle that opens the trunk . Hope this helps

IanRC

Hi All, I have been looking through this thread and undertaken the route of sealing the BB ports in the latch to no possitive effect. The trunk works for 3-4 soft closes before I have to reset fuse 71 then I get another 3-4 closes. I thought it must be the latch and my cure had failed so I purchased a new latch from MB. Fitted the new latch today and the latch worked perfectly for about an hour (25-30 open and closes) then stopped. Reset the fuse and all ok again for another hour or so?? Pulling my hair out now and $'s wasted if my latch is ok. Is this a PSE fault or another air leak in the system causing the PSE to time out. I do have STAR so can access the CPU if needed. Any help please, many thanks, Ian

next2pool

It sure sounds like the pump is timing out. Your leak may be between the pump and the latch rather than in the latch itself. I would locate and replace the line from the pump to the latch itself.

moretech

Can you please tell me where the fuse is and what #the fuse is for the pneumatic pump? thanks a lot


moretech

Rafdaddy

I believe it is in the trunk. It may be near the main pump of the left (drivers side) when you lift the tire cover you should find it.I am doing this by memory but I also think that fuze number 44 behind the passenger seat will also reset it. I think it is a 20 amp. I am still trying to get my lumbar and pulse control working. Also getiing my top to go up and down at the door. It will work once or twice and then stop. Good luck

moretech

I just did mine, all 6 ports but I notice when I pull my latch handle I still hear a short hiss. much better than before.
Did I miss something?, I haven't done a reset yet, had 2 bad ports for sure but did not see anything else. all six looked real solid when I put the unit back in the car. lt opens fine, still have my trim off but the rest is together. Not sure where this hiss is from lines red and yellow look brand new. I am not sure if there should ever be a little hiss or not when the mechanism engages when pulling the latch handle
Moretech

cyglee

moretech... there is a definite sound when pulling the latch, can't really call it a hiss. Do the reset ( I pulled 20A fuse ) and test if the trunk soft closes. Repeat it multiple times, if it works, you should be good.

moretech

So glad to get my 2003 soft close working . So good a write up
Moretech

Jan T

Ha ha, I thought I was exempt since my problem with the trunk close was so infrequent a few months ago. However, now experienced two instances over the last few days. But isn't it odd that right after resetting by disconnecting the negative battery that the trunk then closes fine without even starting the car?

moretech

only a guess but it may be it has a very small leak that causes an intermittent problem. That is, you'll have to wait it out and see if over time it acts worse and then pull it out and check for cracks. I had to do a couple of resets since working on mine right after gluing but has been fine since. I have noticed it relock itself (engine off) if I DO NO OPEN it within a short period after pulling the INSIDE car release. MAYBE a safety factor?


Moretech

Jan T

Yeah it has been more frequent recently, so I may be due to pull it and try the glue process. I just find it odd that when I reset it, I don't hear any pump noise or anything and it then closes fine. Maybe it filled with air from the pump before it tripped the fuse, so with reset it already has air in it to shut right away.

Jan T

I took it out and glued the 6 ports, and for a rookie it took me a couple hours. Buggiest issue for me was getting that ball socket joint off and on. I really had to get my hands way up there and get some force on it. Now not sure if I used the right glue though. I remember the initial post about using Gorilla epoxy for plastic, but when I got to Lowes found only Gorilla 5 minute epoxy that indicated it was good on many things and said "most plastics". They had other epoxy that indicated for plastics, but it was 20 minute set time. I know some of this stuff drips, and I didn't want to be putting on epoxy and holding it vertical for 20 minutes for each port, so I got the Gorilla 5 minute epoxy. When I was done, it seemed like the glue was still kind of soft and kind of rolled off the plastic where I had spilled some. But it did also indicate 24 hour cure time, so I assembled everything back, and kept the battery disconnected to be sure it didn't operate while the epoxy cured. Just hope that was the right glue, we will see.

next2pool

That's more or less what I did and it has been working great ever since.

Jan T

Seems to have worked, but over time will tell. In testing it several times it hissed at me once, so not sure what that means. But the red trunk light on the door remains on, and also when arming the car the doors lock, but the lights don't flash. Like some have mentioned funny things happen when disconnecting the battery. Also, people should watch out in turning those alenwrench bolts, as it seems I stripped one.

moretech

I do not think it is closed all the way or trunk light would go out and you would have 3 flashes. It could be ball and socket clamp is not in right position on rod. I am not sure but it may control trunk light circuit based on how far it moves the rod when trunk closes. It was a real bugger for me, had to get extra help from my mechanic to get that darn clamp closed and as high up on the rod as I could get it. I've had no trouble with the lite circuit.


Moretech