sebaztianl

I'm certain that I would need to buy one PSE pump. My SL is not unlocking/locking with either the key or the center lock buttons, my roof used to work until today that i decided to take the pump out to check it and now the fuse 71 is blowing as soon as I putting in ( 4 fuses blown )

Do i have to program the PSE pump after I buy it from you or is it just plug and play?

Thanks in advance

stykshooter

Following

Rudeney

There is no programming for the PSE module. But I am curious about the fuse. 71 is for the COMAND unit. 54 is for the PSE:

http://benzbits.com/R230/Fuses/RearFuses.pdf

DavidCA

Just a couple of corrections to the above, there is some coding for PSE units, but it is settings for type of seats in car, speed at which the doors lock when driving, etc.
So therefore the PSE is not coded to a specific car and is more or less plug and play.
Please see the attached list of coded parameters.

The fuse chart link is incorrect, that is for a SL for 2009 and later.
The fuse for the PSE unit is #71 (f71)

Rudeney

Thanks, David! I did not realize the fuse panels had changed with the facelift. As for coding the PSE, it does have those adaptation options, but I don't believe that you'll find one that came from a car with different settings. And some of those do not require coding to set - like the selective unlocking, which can be user set via the SmartKey buttons.

sebaztianl

Just replaced the pse pump, the fuse is not blowing like before and now I can hear the pump "working" however still no lock or unlock and the roof still doesn't open and shows the "close trunk separator"

Any ideas?

Heatwave

Is the trunk separator fully extended and latched on both sides?

moretech

Check that all the hoses are on the proper ports and the connections are tight. Could be a vacuum leak somewhere.

moretech

sebaztianl

I'm going to bridge the separator switch today and see if that's the problem. The PSE pump wasn't working before but the roof was working properly. After I removed the pse to inspect that's when the issue started.

Thanks in advance

sebaztianl

No luck after bridging the cables

I'm running out of ideas of what might happened when I removed the PSE pump because it was working flawlessly before ( the roof)

sebaztianl

Took it to the shop to go under he STAR treatment:

The shop says that the PSE Needs to be replaced with correct one ( bought a S class pump)

Also that the roof it's a different issue but I told him this "close trunk separator" problem started the same day I removed the bad PSE.

Can I just swap the motor from the wrong pse into my "bad PSE AND HOPE FOR THE BEST? LOL

moretech

I would say try it and see if it is an exact fit. You need a bit of luck. Before taking it apart examine it closely to see if there are matching numbers on the two motors. If so, I think you can switch them. Check electrical connectors to see if they are of the same type and color codes match on the wiring. Just hope the motor is the problem in the old pump. Looking on ebay you've got a lot of bucks in any PSE, new or used. Always try to check with the forum members on this kind of problem and get good part #'s. Most of the time I find a member can nail it on a part number just give it some time. Mercedes is an exact science kind of car on these parts.

moretech

sebaztianl

Thank for the advise.... will tackle it this week and cross my fingers!

bobterry99

If the motor is in fact the problem with the original pump, then swapping may restore the locking function, but it is not intuitive to me that it will correct the problem with the partition switch status.

sebaztianl

I'm looking for a PSE PUMP in case this method doesn't work

stratmax

Is there anyone out there that services the PSE pump?
I should add, a credible source.

Thank you

papuhl

Hello
Just wondering if you solved your problem of the doors still not locking after chasing out the PSE pump?

I am having an intermittent problem with my PSE locking pump on my 2007 SL550. After sitting for a while, the PSE pump doesn't run and unlock or lock the doors (not with the key fob or the inside lock/unlock buttons). If I start the car and let it run for a while, it works again. I suspected a battery voltage issue. I just changed the convenience battery with a new MB battery - this doesn't seem to have helped.

After the PSE lock/unlock works, it will work for a short while. If I let the car sit for even a few hours it will stop working again, until I start the car and let it run. Then it begins to work again.

This all seems rather odd to me. Any ideas? (I live in California, and mine is a 2007 model year -- I dont' have any wet trunk issues). Has anyone else had this same problem? If so, I would love to hear how you solved it. Thanks - Pete

Rudeney

You have a leak somewhere. The leak causes the pump to run continuously and when that is detected, the pump shuts down to protect it from overheating.

Troy Garwood

Hello - new to the forum. I bought a 2007 SL550 about a year ago - LOVE it!
Having first real issue now and it sounds very similar to what's going on in this thread.

Symptoms:
1. The convertible top won't open -> display message in driver console showed shut the trunk partition all the way, however, the trunk partition was shut all the way.
2. Shortly after problem 1, the trunk would not open using the FOB or the button/lever on the driver side door. However using the mechanical key in the trunk, I can still open the trunk.
3. The doors won't lock using the FOB.

Troubleshooting so far: I verified the trunk partition was shut. I checked the fuses behind the passenger seat. Weirdly, I found a 20 amp fuse already blown, but laying at the bottom of the fuse compartment - I suspect someone previously pulled a blown fuse out and it dropped into the area, and couldn't get fat fingers in to pull it out! I discovered fuse f71 was blown (20A), replaced it, and it instantly blew again. f71 seems to be connected to the central locking system and the remote trunk release according to the A230 MB fuse diagram, so that seems to make sense that those issues are occurring together. Obviously, there is some sort of grounded wire or failed component that is causing the overcurrent condition on f71 since it blows immediately.

I found a YouTube video showing how to check the trunk partition switch - but I don't understand how the tech was checking voltages on the wires to the switch, without making the wires bare (I'd like to avoid that, if possible).

I've read a few MB owner threads that talk about PSE pump issues, but I don't really understand what the PSE pump does. I did remove the power leads to the PSE pump (driver side of the spare tire right?), and replaced f71 fuse again, and it still blew instantly, so the ground/problem seems to be somewhere besides that pump.

I scheduled a service appointment with the local MB dealer, but if I can find the solution, I'd love to fix it myself, because I suspect it probably isn't a hard fix. I do have some tools and skills, but not the expensive testing equipment, wiring diagrams, nor much experience fixing MB's.

If anyone can offer more advise, I'd greatly appreciate the help.

Best,
Troy

Rudeney

You have two problems. One is the partition, the other is the PSE pump. Fuse 71 blowing is definitely a bad PSE pump. I suspect you unplugged the hydraulic pump and not the PSE pump. The PSE pump is buried in a sound-insulation box below the hydraulic pump. The PSE pump operates all the pneumatic accessories in the car, which includes the door locks, trunk latch, multi-contour seat adjustments, and the locks on the rear cabin stowage compartments. With it not working, that;s hwy the door locks and trunk latch are malfunctioning.

I think you are going to be unpleasantly surprised at how much the MBZ dealer is going to charge you to fix this. At dealer prices, the pump itself is over $1000. My advice is DIY if you can, or find a good indy shop.

DavidCA

Troy ,
To assist you locating the correct items, please see the attached images.





Main 10 way connector to PSE pump


PSE pump

moretech

I notice in Ebay a repair service in Boca Raton Fl that say they can fix one for about $330. I know nothing about them but you might give it a thought after looking at their ad in Ebay.

moretech

DavidCA

I rebuild / recondition these SL PSE unit and sell them on eBay in the UK, Europe, etc.
I don’t do a “repair service” on customer’s pump, I just sell complete, tested, ready to go units. As a guide I charge £400 plus next day shipping of £15 (around US$585 I think), to the UK.
I upgrade the software of my pumps to the latest, 06 48 version.
I test my units on my car and code them ( with a SDS diagnostic system) so they are plug and play for my buyers.
You really need a car to fully test them.
Obviously I am too far away to help except with advice, I would ask the repair service how they test the units and what guarantee / warranty they offer. I would also check what they will charge to return your unit if they say they cannot repair it.

pslauenw

Hi there I am just about to purchase a 2003 SL500 with 112K on the odometer here in Halifax, Canada. When I test drove the car they could not get the glove box or the trunk open. And the doors would not lock with the Keyfob (No Keyless Go, and I didn't test the interior lock buttons at the time). Interesting the centre console did open as did the compartments behind the seats. I was able to open the trunk using the manual keyhole. When I tried to lock the car with the remote key button it didn't lock, but when I opened the door with the handle the alarm did go off indicating the key fob is transmitting property and the alarm is arming. Sounds like the PSE pump but can the centre console and storage compartments not be affected? Also could not get the glove box open whatsoever.

moretech

I could be all messed up but see if the glove box is locked with the key! trunk too! I think that sounds most likely.--overides the remote

moretech