Hey,

I was wondering if the 1995 S320 Sedan central locking system (that goes behind the passenger side rear seat) will work on a 1995 S500 Sedan. I called the MB dealership and they said it changes with VIN number but I wanted to make sure that a 1995 s320 sedan central locking system pump will work with my 1995 S500 sedan.

Thanks

bump..m.b. doc hasn't shown his presence yet

If you have access to a GOOD parts man, as him to look it up by model not VIN and compare the 320 and 500. Chances are it'll work. May depend on accesories, main being the ortho seats, also the vacuum operated fold down head rests. What's "the deal", you have a used one available or what?
Gilly

__________________
Click here to see the items I have up for auction at EBay

Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)

Hey Thanks. Someone on the board is selling one to me so I was going to go ahead and order it.

My s500 has the seat headrests that fold.

The reason I am purchasing is because the locking isn't working with the key or keyless entry. It has to be opened manually.

The part # he gave me is one digit off of what mine is.

s320's part #:140 800 23 48
s500's part #140 800 28 48

Also, the seller said HIS is made in france? I thought it should be made in germany?

any more info would be appreciated because I dont have access to someone who can look it up for me.

the work you did on the 948 is impressive


Thanks!

I'm afraid that since you have the "fancier" car that this pump might not have all the ports you need. Maybe not though. More afraid if you have the fancier "Ortho" adjustable seats. Country of origin I wouldn't sweat. The 2 cars are the same years? Can you maybe talk him in to sending you the pump and pay him if it works with your car, otherwise you return it with 10 bucks for his troubles? Plus some shipping money?
Gilly

__________________
Click here to see the items I have up for auction at EBay

Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)

Phil might be able to give you some advice too, or a price on a new pump:
http://catalog.peachparts.com/

Gilly

__________________
Click here to see the items I have up for auction at EBay

Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)

Thanks for your help! I'll give him a call.

The lock /unlock/lumbar/headrest(if you got them) and aux vacuum come from the pump under the passenger rear sear. The later pump does not have the manifold and distribution is handled thru various splitters. its not a big thing but if you look it up on Phils' site he shows the various couplers and plugs. This was done so the pump could be used in universal applications.
The one next to the gas tank in the trunk is the "close assist" pump the one that pulls in the doors and trunk lid. I would check those #s they seem to be awfully close to the closing assist # 140-800-08-48

Hey,

My closing assist pumps work fine. Just my locking system is messed up. The doors won't unlock with the key or keyless entry..Have to manually do it from the passenger side and pull open the driver side door or other doors. I'm pretty sure its the central locking system problem.

Also the trunk is affected b/c of bad cls pump.

I just wanted to make sure that the parts are the same and interchangeable.

Thanks for the tip. If anyone else knows for certain, I'd appreciate it.

I had the exact same problem with my '97 S320 and solved it by replacing the pump under the rear seat passenger side. The best price i found was at tis site....www.mercedes-benz-parts-direct.com

I was able to disassemble the unit removed the electric motor which needed brushes. I found the exact motor on the net but the dealer refuse to sell retail, only in quanities of 1000+. I have received and installed the unit, it is a BOSCH unit (i don't have their part number here now but i can get it for you if you like). BTW, i paid $321....

Good luck

Do not worry about the degree of fanciness of the ortho seat. The
seats gets only one line of pressure tube each and a third
to a pressure reservoir. (the different bladders are operated
by valves that allow various pressure to enter according to
the dial set. No electronic). Here is my S320 1998 pump;



The lumbar lines are emerging from the connector-bar seen
at the left in the image.

You may have to take the car to Mercedes to have
the pump being told which extra equipment you have (like lumbar).

Before that, I would make sure that the pump actually gets
an electric signal to open/close the doors...

br,
syljua

__________________
1998 CL500 W140
1984 230E W123

...and do any of the other functions of the PSE under the
seat work? Like;

1. release of rear head rest (button with just one image, not raising, then it is electrical)
2. flaps of AC/heater when you press "rest" after switching off engine.(should hear flaps moving)
3. Retractable trunk grip.
4. Lumbar support.

Is the opening/closing of door locks possible with the button on the inside of
car?

If the pump is running at all, I would have a look at the rest
of the electrical system.

br,
syljua

__________________
1998 CL500 W140
1984 230E W123

It may not be the pump. There is a "demand limit" that prevents the pump from running and running if a hose were to break somewhere. I think the maximum time the pump will cycle for any request, whether that be door lock, door unlock, trunk grip extend, trunk grip retract, headrest retract, lumbar inflate, or trunk pull down release (the mechanism actually assists the trunk pull down in some fashion) is 30 seconds. It may be that once that limit is reached, the system "kicks the offender off the island". There may be a certain number of times this limit must occur for each sub-system, but possibly not. (That is the case with the closing assist).

The reason I say this is that my lumbar bladders were ruptured, but no matter what I did with the switches on the seats, the pump never cycled on to provide pressure. Once I pulled/replaced the power, it would continually try to reinflate the busted bladders until the time limit was reached, then it would quit trying forever. This may not be the case with the central locking system, but I'm sure this was the situation with the lumbar supports.

Try pulling the power to the pump for about 10 seconds and see what starts working (or not, if I'm wrong.)

The system has certain pressure parameters it expects for each task requested of it. For instance, if you request door lock and there's a slow leak in one of the actuators, the max pressure for that system won't be reached in the required amount of time and that will trigger a DTC.

On my '92 300SE, I had trouble with the actuators for both the driver front and rear door locks. I'd get a DTC for "Central Locking System Air Demand Too High". I checked the actuators (easy to get out the rear doors - PITA on the front) and they both leaked air on the pressure cycle. Several of the tabs that hold the units together had cracked and the suckers would leak air under pressure - but they worked just fine under vacuum. I fixed the problem by disassembling them CAREFULLY and spreading some silicone grease (NOT axle grease) on the diaphragm sealing surfaces, then using some zip-ties to hog-tie the actuators back together. Working just fine - look like heck, but when the door panels go back on, who's gonna see?

Good luck.