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S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

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Old 02-06-2012, 09:09 AM   #1
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96 S500 Central Locking Pump- How to install?

Can anyone provide me with instructions on "how" to properly change out the Central Locking Pump? Of course there are several hoses etc....I got a used one that works great and it DOES still have the wires attached. However, they appear to be "thin" in some areas on the end. Also, it appears that some are attached to a "plug" that seem like they basically "snap" on by just pulling them up. These are too expensive to just assume they are as simple to change out as it may appear so I just want to be cautious with it. I attempted to pull up on one of the plugs(that the hoses are connected to) and it's on there pretty snug. Didn't want to use a pair of pliers to remove it and cause damage.(in the event a special tool is needed to remove them). Can anyone provide any assistance in this matter? Is there a DIY site that shows a "step by step" on changing these?? Thanks for any help you can provide.
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Old 02-07-2012, 08:08 AM   #2
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Their is a site called V12 UBER ALLES vacum pump help.Try it before you replace pump
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Old 02-07-2012, 03:50 PM   #3
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how much did it cost you for the pump? can you post the picture? before you start pulling off the plugs connected on your old pump in the car do mark which one goes where before you start getting confuse, it is a hassle to be identifying each line if in case you have pulled it out already. then you have to manually blow on the line to see which connects to which. the pumps includes central lock for the passenger cabin, fuel door panel, and trunk lock.
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Old 02-08-2012, 12:09 PM   #4
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this is what happens if you unplug it from the pump assy. make sure to mark each line using sequential number corresponding to the vacuum pump
Attached Thumbnails
96 S500 Central Locking Pump- How to install?-img_8746.jpg  
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Old 02-08-2012, 12:51 PM   #5
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Originally Posted by oldsinner111 View Post
Their is a site called V12 UBER ALLES vacum pump help.Try it before you replace pump
Uber Alles site does not have any DIY for central lock vacuum pump, it is for door closer pump only.
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Old 02-10-2012, 09:08 PM   #6
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Quote:
Originally Posted by starky View Post
Can anyone provide me with instructions on "how" to properly change out the Central Locking Pump? Of course there are several hoses etc....I got a used one that works great and it DOES still have the wires attached. However, they appear to be "thin" in some areas on the end. Also, it appears that some are attached to a "plug" that seem like they basically "snap" on by just pulling them up. These are too expensive to just assume they are as simple to change out as it may appear so I just want to be cautious with it. I attempted to pull up on one of the plugs(that the hoses are connected to) and it's on there pretty snug. Didn't want to use a pair of pliers to remove it and cause damage.(in the event a special tool is needed to remove them). Can anyone provide any assistance in this matter? Is there a DIY site that shows a "step by step" on changing these?? Thanks for any help you can provide.

DO NOT PULL ON WIRES as other post with photo indicates.

The wire harnesses are all moly modules which plug into the pump body and are held in place with a locking mechanism.

There is a SLIDING plastic locking mechanism tab on the short side of the wire assembly which must be pulled SIDEWAYS not UP to release the wiring module. The smaller modules have locking tabs which must be released .

Good luck.
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Old 02-11-2012, 04:31 AM   #7
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96 S500 central locking pump

paid $150 for it. came out of 97 S420 and had "exact" part number so it worked out great. Just so happen I saw an ad on Craigslist and guy was parting it out. It ran good but was wrecked. Got the chance to see Pump perform "all" functions perfectly. Yes, I will post pics. However, I'm still not clear exactly "how" to remove the wires yet? I followed your instructions and doesn't seem to pull off without significant resistance not sure if I'm doing it properly or if it's supposed to be that way? dont want to risk breaking anything?
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Old 02-11-2012, 06:20 AM   #8
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Quote:
Originally Posted by starky View Post
paid $150 for it. came out of 97 S420 and had "exact" part number so it worked out great. Just so happen I saw an ad on Craigslist and guy was parting it out. It ran good but was wrecked. Got the chance to see Pump perform "all" functions perfectly. Yes, I will post pics. However, I'm still not clear exactly "how" to remove the wires yet? I followed your instructions and doesn't seem to pull off without significant resistance not sure if I'm doing it properly or if it's supposed to be that way? dont want to risk breaking anything?
if you really wanna get instruction then post picture. otherwise there are several types of pump and the plugs are not the same. up to you, the longer you post then don;t expect help in time.
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Old 02-11-2012, 11:50 AM   #9
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central locking pump pics

Sorry for the delay, here are the pics i took part#140 800 31 48 this is "exact" one that's currently in my 96 S500. Again as reiteration, I'm trying to find out proper way to remove and install. thanks for any help you can provide.
Attached Thumbnails
96 S500 Central Locking Pump- How to install?-9045860510910_orig.jpeg   96 S500 Central Locking Pump- How to install?-7045860510835_orig.jpeg   96 S500 Central Locking Pump- How to install?-6045860510830_orig.jpeg   96 S500 Central Locking Pump- How to install?-5045860510824_orig.jpeg   96 S500 Central Locking Pump- How to install?-4045860510815_orig.jpeg  

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Old 02-11-2012, 07:38 PM   #10
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Quote:
Originally Posted by starky View Post
Sorry for the delay, here are the pics i took part#140 800 31 48 this is "exact" one that's currently in my 96 S500. Again as reiteration, I'm trying to find out proper way to remove and install. thanks for any help you can provide.
Take a picture of your old pump which is still connected and see if they are the same as the one you just bought.

If it is the same then you can just pull and connect one at at time and makeing sure you place each and every plug in it's proper position. MAKING SURE YOU DO NOT BEND ANY OF THE AIR LINE AND MAKING SURE YOU SNAP THE TUBE PROPERLY AND SECURELY INTO THE NEW PUMP.

ANOTHER WAY IS TO MARK BY NUMBERS ON THE PUMP AS WELL AS THE LINES USING MASKING TAPES.
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Old 02-11-2012, 07:45 PM   #11
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So I can just PULL UP on these connectors? should I use pliers of some sort? They don't pull up easily by hand. Btw....pump is "identical" I've put them side by side when I purchased it.

Last edited by starky; 02-11-2012 at 07:49 PM.
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Old 02-11-2012, 07:51 PM   #12
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So I can just PULL UP on these connectors? should I use pliers of some sort? They don't pull up easily by hand. Btw....pump is "identical" I've put them side by side when I purchased it.
NEVER USE A PLIERS, just pull them off with an assist of a plastic or screw driver placing it underneath the plug and assist while pulling it off at the point and not at the line simultaneously
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Old 02-13-2012, 07:00 AM   #13
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FYI.......removed & replaced pump works perfectly as I expected. NOW...another problem. ALL of the doors unlock and lock EXCEPT the PASSENGER door. It has to be done "manually". Also it's important to note: It has ALWAYS been like this SINCE I purchased the car so I'm confident it's not any problem with the pump. OH, another question(if I may). I noticed before my pump stopped working completely it "immediately" stopped a few hours AFTER I had just come from the car wash. I've heard that water/moisture somehow gets in the floor board area and can cause it to go bad? (not sure IF this was the culprit as I've washed the car "countless" times in the 2 years I've had it without any problems) But IF this theory is true what can I do (if anything) to prevent this from happening??? I would hate to have to replace the pump again??? Any advice would be appreciated. Thanks

Last edited by starky; 02-13-2012 at 07:03 AM.
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Old 02-13-2012, 10:35 AM   #14
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first on how the water could have gone inside, tell us how was the car wash done? was the car lifted and pressure washed underneath? if not water would be next to impossible to get underneath your rear seat right side. If it was pressure washed underneath, then you have to check if the rubber plugs are all in place.

on the driver side door, take out the door panel and visually check if the connections were not pinched, you can take out the lock /vacuum actuator and physically check if there are any cracks, and you can blow it with your mouth and check the function, if cracked then you can do remedial by using an plastic expoxy bond to repair, making sure that there are no holes to let the air pop out.

trace the vacuum line from the door to the pump side and see if there are any pinch or crack line that may cause the actuator to malfunction. if there is a loose air on any of the system the pump may not last long since it will keep on pumping therefore burning out the motor.

try blowing through the line which is connected from the pump to the left side / driver door actuator and see if you can manually activate the lock, if not then there is another problem.
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Old 02-13-2012, 10:35 AM
 
 
 
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2001, 96, alles, central, fuel, locking, modules, mount, picture, pump, recode, relay, s500, uber, v12, vacuum



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