SL55/63/65/R230 AMG: trunk closing problem
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Joined: Aug 2009
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From: Oakdale, CT
2003 SL55 AMG
I can't tell you which fuse it is off the top of my head, as I don't have the fuse diagram at the moment. If your trunk isn't sucking down like it should, you probably have a leak somewhere on or around the trunk latch. If you have problems with the door locks also, then it could also be your pse pump. I would start by removing the trunk latch assembly and checking the hoses for any obvious cracks that can be sealed. If you don't find anything obvious, you may need to replace the assembly. I had to replace mine, and if I recall correctly, it was around $320 from the dealer. Pulling the fuse will only reset the safety time out for the pump. This is only a temporary fix and it will stop working again soon. Doing this too often will cause the pump to run excessively which could damage it. If you have to replace the pse pump, you'll wish you just spent the money on the latch instead.
Last edited by aluthman; Sep 7, 2010 at 11:46 PM.
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From: Maryland
Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon
I know this is an old thread, but the following is good info:
It's a 20A fuse, numbered 171 on your fuse diagram. Its located underneath the passenger side rear cubby.
My soft close trunk latch stopped working yesterday. Did the research on here, popped that fuse and reinstalled and all is well with the world.
It's probably foreshadowing of doom, and a new PSE pump will probably be needed in the near future. We'll see....
It's a 20A fuse, numbered 171 on your fuse diagram. Its located underneath the passenger side rear cubby.
My soft close trunk latch stopped working yesterday. Did the research on here, popped that fuse and reinstalled and all is well with the world.
It's probably foreshadowing of doom, and a new PSE pump will probably be needed in the near future. We'll see....
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I know this is an old thread, but the following is good info:
It's a 20A fuse, numbered 171 on your fuse diagram. Its located underneath the passenger side rear cubby.
My soft close trunk latch stopped working yesterday. Did the research on here, popped that fuse and reinstalled and all is well with the world.
It's probably foreshadowing of doom, and a new PSE pump will probably be needed in the near future. We'll see....
It's a 20A fuse, numbered 171 on your fuse diagram. Its located underneath the passenger side rear cubby.
My soft close trunk latch stopped working yesterday. Did the research on here, popped that fuse and reinstalled and all is well with the world.
It's probably foreshadowing of doom, and a new PSE pump will probably be needed in the near future. We'll see....
and yes, the fuse is the only 20 amp fuse behind the pass seat in the cubby. you remove the cover and the fuses are further down under- i use needle-nose pliers to remove and reinsert fuses there. unless there is an easy way which i am not aware of...
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From: Central WI (BFE)
SL55, ML500 & Acura TL
Mine either. Never new I had it until my SA last spring says "do you want us to fix your soft close" and I said my what? He responded by suggesting not to fix it so i didn't.
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From: Maryland
Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon
But if it's not working, the top won't stow, the trunk won't seal completely, and you'll get an error on the MFD. How could yours not be working, but everything else is?
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the pump is smart to identify which circuit is leaking and disables pumping into that one. so you can have some of them working and some of them not working and the pump ignoring the leaky ones altogether. resetting the pump fuse makes the pump forget the leaky circuits and start pumping into them again. until the next timeout and ignore if the leaky circuit is not repaired.
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From: Central WI (BFE)
SL55, ML500 & Acura TL
separate air circuits. you have one for the trunk, one for each door lock, one for each air bag in the seats, etc. there are quite a few of them.
the pump is smart to identify which circuit is leaking and disables pumping into that one. so you can have some of them working and some of them not working and the pump ignoring the leaky ones altogether. resetting the pump fuse makes the pump forget the leaky circuits and start pumping into them again. until the next timeout and ignore if the leaky circuit is not repaired.
the pump is smart to identify which circuit is leaking and disables pumping into that one. so you can have some of them working and some of them not working and the pump ignoring the leaky ones altogether. resetting the pump fuse makes the pump forget the leaky circuits and start pumping into them again. until the next timeout and ignore if the leaky circuit is not repaired.
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From: Maryland
Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon
separate air circuits. you have one for the trunk, one for each door lock, one for each air bag in the seats, etc. there are quite a few of them.
the pump is smart to identify which circuit is leaking and disables pumping into that one. so you can have some of them working and some of them not working and the pump ignoring the leaky ones altogether. resetting the pump fuse makes the pump forget the leaky circuits and start pumping into them again. until the next timeout and ignore if the leaky circuit is not repaired.
the pump is smart to identify which circuit is leaking and disables pumping into that one. so you can have some of them working and some of them not working and the pump ignoring the leaky ones altogether. resetting the pump fuse makes the pump forget the leaky circuits and start pumping into them again. until the next timeout and ignore if the leaky circuit is not repaired.
If it just disables that circuit, why are the other members above, not receiving an error in the MFD like I did? How they able to fully close their lids but I couldn't? Granted, I didn't slam it down. Is that what needed to be done?
I understand the logic, and maybe all I needed to do was slam the damn thing. But after years of closing it, with just the slightest amount of pressure, slamming it seemed like it would do harm.
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I checked the fuse and it seems good, but no soft close. I think I will simply forget I am supposed to have it and continue to close it the way I always have. Interestingly my SA has never mentioned it...and God knows they wanna fix every little thing LOL...
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From: Maryland
Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon
My guess is you just need a new latch mechanism. Pretty simple DIY.
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From: Central WI (BFE)
SL55, ML500 & Acura TL
Makes sense. But using that logic, when my trunk circuit failed, the system should've just disabled it and let me go on my merry way, without being the wiser. However, I couldn't even close my trunk manually. It would pre-latch, but no matter what, it wouldn't fully latch. I could drive it and the trunk lid wouldn't flap around, but if it were raining, my trunk would have been soaked.
If it just disables that circuit, why are the other members above, not receiving an error in the MFD like I did? How they able to fully close their lids but I couldn't? Granted, I didn't slam it down. Is that what needed to be done?
I understand the logic, and maybe all I needed to do was slam the damn thing. But after years of closing it, with just the slightest amount of pressure, slamming it seemed like it would do harm.
If it just disables that circuit, why are the other members above, not receiving an error in the MFD like I did? How they able to fully close their lids but I couldn't? Granted, I didn't slam it down. Is that what needed to be done?
I understand the logic, and maybe all I needed to do was slam the damn thing. But after years of closing it, with just the slightest amount of pressure, slamming it seemed like it would do harm.
Now that you mention it, it clearly is not right and since it does not have anything to do with the drop top it is starting to bug me. I just might have to replace the latch while my SL sits in the garage for the long Milwaukee winter.
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From: Maryland
Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon
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OK, so last night I pulled the fuse, examined it and it seemed good. Put it back in, and no soft close. I assumed another issue. Upon further thought, I REPLACED the fuse, and...soft close works.
Will it keep working? Do I have a air circuit leak that caused the fuse to blow? Who knows. But for now...it works.
Will it keep working? Do I have a air circuit leak that caused the fuse to blow? Who knows. But for now...it works.
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From: Maryland
Eurocharged 2004 E500, Eurocharged ECU/TCU 2005 SL600, 2010 Caddy SwaggerWagon
OK, so last night I pulled the fuse, examined it and it seemed good. Put it back in, and no soft close. I assumed another issue. Upon further thought, I REPLACED the fuse, and...soft close works.
Will it keep working? Do I have a air circuit leak that caused the fuse to blow? Who knows. But for now...it works.
Will it keep working? Do I have a air circuit leak that caused the fuse to blow? Who knows. But for now...it works.
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Logic says it the circuit will continue to eventually fail until the leak is fixed. Might not blow the fuse again, but will most likely disable the circuit at some point. Or who knows, maybe you don't have a leak at all, and you just tripped that fuse for some reason. Only time will tell I suppose. Glad it's working now though. Sooooooo much better, huh?
On the other hand I am one of these freaks that will grind my teeth now that I know something that is supposed to work...is not
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The pump logic is very forgiving. If a circuit is disabled- it means it is leaking. If you reset it it will work for a while and then will stop again. Do this a few times and you will be looking at a new pump... $700 brand new.
When it is quiet around the car reset the pump and soft close the trunk. Listen. Yu can usually hear the air wooshing in the latch area. If you don't have a warranty it is an excellent low effort weekend project.
When it is quiet around the car reset the pump and soft close the trunk. Listen. Yu can usually hear the air wooshing in the latch area. If you don't have a warranty it is an excellent low effort weekend project.
Last edited by alx; Oct 13, 2011 at 10:03 PM.
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Joined: Feb 2009
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From: Central WI (BFE)
SL55, ML500 & Acura TL
OK, so last night I pulled the fuse, examined it and it seemed good. Put it back in, and no soft close. I assumed another issue. Upon further thought, I REPLACED the fuse, and...soft close works.
Will it keep working? Do I have a air circuit leak that caused the fuse to blow? Who knows. But for now...it works.
Will it keep working? Do I have a air circuit leak that caused the fuse to blow? Who knows. But for now...it works.
If it works, I am going to be pissed because I am willing to bet if I would have told my SA to fix my soft close when he asked me about it, he would have charged me up the butt as usual instead of just replacing the fuse.
Just like when my 80mm TB ate a gasket. I had just put down a snotty nosed kid in a ricer and all of a sudden no throttle. The Little ***** thought he was going to beat me to the freeway on ramp. No dice little *****. Not even close. Then I get a red warning on the MFD. something like: ESP warning go to workshop you dumb ***. The stealer pulls codes. Says TB bad. I get on the forum and in minutes I have half a dozen of my modded E55 buddies saying hahah your TB ate a gasket. easy fix. I tell the stealer to have a look at the throat of the throttle and they will most likely see a gasket stuck in it. They say no way, bad TB must replace $800 installed or whatever. I call the shop manager and told him I was on the way over. He and I walk out to my SL and have a look. Bottom line: I get charged for like three hours tech time and a $5 gasket.
Sorry about the rant! I'll blame in on the glenkinchie 12. Very nice by the way. I think my point was this forum is full of great info and has saved me tons of $$$ over the years. Thanks guys.
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SL55AMG, Ferrari 348, Ferrari Testarossa, Ferrari F40, Ferrari Mondial t, Ducati 916, Indycar
I shouldn't have read this thread! Mine just started something odd.
When I close the trunk, it does its thing. I hear it suck. But when I look at the trunk, it isn't quite closed and there is about a 2 degree angle between the trunk and the rear fender.
It almost seems like the trunk needs to be adjusted. Has anyone done this?
When I close the trunk, it does its thing. I hear it suck. But when I look at the trunk, it isn't quite closed and there is about a 2 degree angle between the trunk and the rear fender.
It almost seems like the trunk needs to be adjusted. Has anyone done this?
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From: Asheville, Atlanta
SL 65 AMG, Porsche 911 (993), 2014 Cayenne GTS, 2013 Toyota Highlander Limited
I did the fuse reset when the latch stopped working and also replaced my struts which were worn and not holding the trunk up.
The system worked 3 or 4 times and failed after the struts were replaced, but after the new struts broke in a bit, as they were quite stiff in operation, the system is working fine now....
I am wondering on how much the struts effect the total operation and tripping the fuse, in my case it seems fixed permanently.........struts were $60.......
I did hear some air release the other day, but the operation was not effected...........maybe I am on borrowed time.......
Have a warranty for another 2 years, so I using the trunk more instead of the front seat and I am opening and closing more than usual from the inside switch to see if it fails, so to speak....
The system worked 3 or 4 times and failed after the struts were replaced, but after the new struts broke in a bit, as they were quite stiff in operation, the system is working fine now....
I am wondering on how much the struts effect the total operation and tripping the fuse, in my case it seems fixed permanently.........struts were $60.......
I did hear some air release the other day, but the operation was not effected...........maybe I am on borrowed time.......
Have a warranty for another 2 years, so I using the trunk more instead of the front seat and I am opening and closing more than usual from the inside switch to see if it fails, so to speak....
MBWorld Fanatic!
Joined: Dec 2004
Posts: 4,268
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I shouldn't have read this thread! Mine just started something odd.
When I close the trunk, it does its thing. I hear it suck. But when I look at the trunk, it isn't quite closed and there is about a 2 degree angle between the trunk and the rear fender.
It almost seems like the trunk needs to be adjusted. Has anyone done this?
When I close the trunk, it does its thing. I hear it suck. But when I look at the trunk, it isn't quite closed and there is about a 2 degree angle between the trunk and the rear fender.
It almost seems like the trunk needs to be adjusted. Has anyone done this?
you sure there are no obstacles in the trunk around the hinges and nothing fell in there and is blocking the trunk from closing fully?
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Joined: Feb 2010
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s55 sl55
I did the fuse reset when the latch stopped working and also replaced my struts which were worn and not holding the trunk up.
The system worked 3 or 4 times and failed after the struts were replaced, but after the new struts broke in a bit, as they were quite stiff in operation, the system is working fine now....
I am wondering on how much the struts effect the total operation and tripping the fuse, in my case it seems fixed permanently.........struts were $60.......
I did hear some air release the other day, but the operation was not effected...........maybe I am on borrowed time.......
Have a warranty for another 2 years, so I using the trunk more instead of the front seat and I am opening and closing more than usual from the inside switch to see if it fails, so to speak....
The system worked 3 or 4 times and failed after the struts were replaced, but after the new struts broke in a bit, as they were quite stiff in operation, the system is working fine now....
I am wondering on how much the struts effect the total operation and tripping the fuse, in my case it seems fixed permanently.........struts were $60.......
I did hear some air release the other day, but the operation was not effected...........maybe I am on borrowed time.......
Have a warranty for another 2 years, so I using the trunk more instead of the front seat and I am opening and closing more than usual from the inside switch to see if it fails, so to speak....
Super Member
Joined: Jul 2009
Posts: 603
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From: Asheville, Atlanta
SL 65 AMG, Porsche 911 (993), 2014 Cayenne GTS, 2013 Toyota Highlander Limited
Update on my trunk issue - 6 months okay
I did the fuse reset when the latch stopped working and also replaced my struts which were worn and not holding the trunk up.
The system worked 3 or 4 times and failed after the struts were replaced, but after the new struts broke in a bit, as they were quite stiff in operation, the system is working fine now....
I am wondering on how much the struts effect the total operation and tripping the fuse, in my case it seems fixed permanently.........struts were $60.......
I did hear some air release the other day, but the operation was not effected...........maybe I am on borrowed time.......
Have a warranty for another 2 years, so I using the trunk more instead of the front seat and I am opening and closing more than usual from the inside switch to see if it fails, so to speak....
The system worked 3 or 4 times and failed after the struts were replaced, but after the new struts broke in a bit, as they were quite stiff in operation, the system is working fine now....
I am wondering on how much the struts effect the total operation and tripping the fuse, in my case it seems fixed permanently.........struts were $60.......
I did hear some air release the other day, but the operation was not effected...........maybe I am on borrowed time.......
Have a warranty for another 2 years, so I using the trunk more instead of the front seat and I am opening and closing more than usual from the inside switch to see if it fails, so to speak....
