I just bought a second hand MB 2001 W220 S320 K50 Lorinser with no owner manual and after a week or so central door lock doesn't work. It seems that it has an issue with the trunk because by using the remote control will blow the yellow fuse under the right back seat. The vacuum pump seems to be working right is there another pump somewhere? Is the pse pump the same as close assist? Can one buy just the motor for the vacuum pump if this result to be the case I still have to check that out for sure.?

 

Sounds like PSE pump is bad. I had the same issue. Pump will work but very shortly it will blow the fuse.

 

If you determine that your pump has broken, you'll need to replace the pump.

Make sure you find out where your system is leaking from. This leak is why your pump burned out. In my wife's S430 the leak was within the trunk lock/latch/soft-close feature. Her pump got so hot, the ID Sticker on the outside of the pump was all melted.

If you don't fix the leak, you'll burn out the next pump you put in.

I actually have two pumps not being used at home right now if you end up needing one, contact me and we can work something out.

Both pumps work and have been tested. Let me know if you have any interest and if so, which one.

The pumps I have are:

220 800 05 48
220 800 02 48

I'm thinking $100 + $15 shipping to the USA....I don't know where you are located so shipping might be more if you need international shipping.

But no matter what you do, DEFINITELY find and fix the leak if your pump is burned out.

 

 

Sounds like you have a vacuum leak, it's either the seat lumbars, center lock lines or soft close mechanism lines. Fix the leak and replace the fuse.

 

Hi Shoeman, that problem was resolved, yes it was the vacuum pump that was making a short circuit. Did you mean that pump? Because now it is the Airmatic suspension compressor that burned out. You mean this is burning out as well because there is a leak? Which test is best to do?

 

I think this is next because now it burned the Airmatic suspension compressor!

 

I have a 2003 S500 Left hand drive (Canada). My PSE system is acting funny. I can lock the car with the remote but cannot unlock it. Same with the buttons inside the car, I can lock but not unlock. The soft door close works on all 4 doors. The locks work on all 4 doors and does not unlock any of the doors or the trunk or gas door. The headrests do not work. The driver seat lumbar works. I tested the lines with a smoke machine and all is good. When I try to unlock the car, I can hear the pump running for about 20 seconds and will not unlock. Yellow 20 A fuse is good.

Works:
Lock on all doors
Soft close on all doors
lumbar on driver seat

Not work:
Unlock all 4 doors
Unlock gas door
Unlock the trunk and the silver tongue is stuck in the out position
Rear headrests not working

Anyone come across this? The black plastic board seems to have a bubble but doesn't seem to have a hole. I used an air gun to blow out the black dirt from the pump and hoses. So it seems that air will go one way but not the other in order to unlock. Not sure if there is a clog somewhere.

Any help would be greatly appreciated.

 

Since the pump is working and is working in one direction, I bet it’s the PSE valve block that is bad

 

Thank you for the reply tusabes.



Do you mean this spring-loaded thing? See Pic. Easy to find and replace? Thank you in advance.

 

Burned out transistor?
Help with identifying PSE pump circuit board component.

Hello, everyone. If possible could someone identify what this burned out part is? Trying to fix my board and cant identify it. Pictured would be greatly appreciated.

 

Most people just swap them with a used unit, they don’t open them up and repair them

 

Hi Hank since it looks like your PSE assembly is handy could you locate this part on the circuit board and take a picture of it? It would help me tons. Thank you in advance.

 

This is my first time dealing with the PSE system as well, so anyone with more knowledge feel free to correct me if I mention anything incorrect.
I had the blown fuse as well, tried a new one, blew it again. Unknowingly, I thought my dynamic seat pump was the issue. That original pump had problems of its own, bought another one and now I have a good replacement. I bench tested them both with an adjustable DC power supply. The original clearly made more noise, had a melted housing, yet ran but drew higher current.

Old dynamic seat pump @12V, drew 9.2A, temp went from 86 Deg F to 111 Deg F in 15 seconds
New dynamic seat pump @12V, drew 5.1A, temp went from 85 Deg F to 88 Deg F in 15 seconds

So put that into perspective on how hot these motors get in a short amount of time.

I then plugged in the new dynamic seat pump, heard one of them run for 10 seconds and the fuse blew again.

So now I move onto the PSE pump itself. I pulled it, attempted to bench test the motor and there's a short to ground, also initially suspected by the insulation melted on one of the wires from coming into contact with the hot motor. Now keep in mind it was not seized and would spin by hand, but apply 12V and it would not move. I also opened the vacuum end and the impeller was not damaged. The vacuum manifold also has visible heat damage. I don't see holes but can't rule out the internal passage of the manifold. It holds a vacuum with and without power applied to the coil, which leads me to believe the passage may be melted shut. While I was at it I tested each coil with 12V and all of them function well besides the one next to the melted area, it is very weak.

So, I'll echo what Tusabes said, in most cases it's probably not worth repairing. Sure I can swap in a new motor, but once you have manifold heat damage I think it's a wash.

Moving forward, after I acquire another PSE pump, I still need to troubleshoot where the vacuum leak occurred to make the pump run hot and fail. I have compressed air, a smoke machine and a vacuum pump if anyone would like to make recommendations on what they've done before. I'm hesitant about the smoke machine because the smell isn't too pleasant and don't want it inside the car. I've tried the vacuum pump on each individual line and have gotten mixed results. I assume pressurizing it and observing drop may be more effective.

 

The pump section is standard, and needs no programming.

Section with the control circuitry, valves, etc., has to be programmed to match the options installed on your car. For example, a standard USA S430 will have door and trunk locks, door soft close, and probably rear headrest drop. It isn't likely to have pulsating seats, power trunk open/close, and perhaps other deluxe options found on an AMG S55.

 

I've been reading a lot of posts trying to figure out my issue and from 2hat I've read is most people use the smoke tester so it seems like you are on the right track. With that being said could you please take a picture of your circuit board? I want to identify the component that burnt out on mine so I can replace it. Thank you in advance.

 

Next time I go out there to mess with the car I'll get that picture for you.

I did test each of the lines to determine where the leaks are. I didn't go nuts pressurizing the lines so I stopped at 5 psi with a hand pump. If I still had working PSE pump I believe I could have verified the non-op components through an SDS scan.

I copied this from the W220 wiki regarding the PSE system to ID the ports and their corresponding components:

SK: Main Inlet Line with Air Filter behind the Rear Left Seat Back Grey connector /white air line DID NOT HOLD PRESSURE, UNSURE IF IT'S SUPPOSED TO
KAF: Rear Seat Head Restraints. HELD 5 PSI
HECK: Retractable Trunk Grip (RTG), Boot/Trunk Catch Actuator and Trunk Soft Close Mechanism DID NOT HOLD PRESSURE
TD: Fuel Filler Flap Lock. DID NOT HOLD PRESSURE

FoR: Rear Right Door Lock, Child Safety Door Lock Release and Soft/Self Close DID NOT HOLD PRESSURE
FoL: Rear Left Door Lock , Child Safety Door Lock Release and Soft/Self Close DID NOT HOLD PRESSURE
BFT Front Passenger's (left or right depends on LHD or RHD) Door Lock and Soft/Self Close DID NOT HOLD PRESSURE
FT Front Driver's (left or right depends on LHD or RHD) Door Lock and Soft/Self Close HELD 5 PSI, and observed door lock respond
MKL Multi Contour Backrest (Lumbar Support Bladder all four seats) HELD 5 PSI.

It appears as 3 of my doors, the trunk, and fuel door all have leaks between the pump lines and actuators. It looks like I have some more work ahead before I dive into installing the new pump.

 

If it’s any help to anyone else bothering with this, wire labels work well for marking everything.

 

Hi Shoeman, if you still have the pumps could you message me privately so I can get one of those from you? Thank you.