Fuse Spark and PSE Pump Problem
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 17
Likes: 0
From: Long Island, NY
2005 CLK320 & 2008 BMW 535xi & 2004 Mercedes S500 4matic
Fuse Spark and PSE Pump Problem
Hello. I have a 2004 S500 4matic. Hoping I could get some advice. My locks wont lock or unlock from key FOB or from interior, trunk does not lock, and soft close does not work. Read a lot of posts and came to remove FUSE 62 for central locking and put it back in and still didnt work. So then I came to put new fuse in, it sparked. I am assuming that is indicative of a bigger problem. On the fuse diagram there was other fuses listed for the central locking like fuse 13, but I am assuming fuse 62 is the problem. My question is why did it spark? Does it suggest the PSE pump is bad and giving that fuse a short? Is there a cheaper solution besides replacing pump, or another suggestion to try? THanks
Angela
Angela
Newbie
Joined: Apr 2010
Posts: 2
Likes: 0
s600
Angela,
I drive a 2004 S600 and recently had the same problem. Unfortunately I tried everything but ended up having to purchase a PSE pump for about $550. Ordered from genuinemercedesparts.com. My husband removed the old one and installed the new one himself. Everything works great now..even the soft close on the doors and trunk.
I drive a 2004 S600 and recently had the same problem. Unfortunately I tried everything but ended up having to purchase a PSE pump for about $550. Ordered from genuinemercedesparts.com. My husband removed the old one and installed the new one himself. Everything works great now..even the soft close on the doors and trunk.
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 17
Likes: 0
From: Long Island, NY
2005 CLK320 & 2008 BMW 535xi & 2004 Mercedes S500 4matic
How do know you dont have a leak somewhere that caused the original problem? I dont want to have to replace the pump only to have it damaged again.
MBWorld Fanatic!
Joined: Dec 2004
Posts: 3,063
Likes: 27
From: Tampa, FL
2005 S500 4-Matic, 1978 450SL
Angela,
No one can assure you that a recommended procedure will fix your car. We can't see it, hook up diagnostic equipment, or even listen to it for faults.
But we can rely on what you said, for an indication. If you had a leak, and your pump was OK, replacing the fuse would not blow the fuse right away. The pump would run, you could listen to the doors and trunk (and lumbar supports) for the leak. Eventually, the fuse would blow again.
But because your fuse blows right away, the pump is likely already seized, and therefore, has failed. Replacing the pump may not fix your whole problem. It would be a first, and very likely necessary, first step toward troubleshooting.
The pump could have failed because it was simply old and worn out. Or, it could have failed from a leak that wore it out. In either case, it looks like you need to replace it. As to whether there is anything else wrong, we simply cannot tell at this point.
No one can assure you that a recommended procedure will fix your car. We can't see it, hook up diagnostic equipment, or even listen to it for faults.
But we can rely on what you said, for an indication. If you had a leak, and your pump was OK, replacing the fuse would not blow the fuse right away. The pump would run, you could listen to the doors and trunk (and lumbar supports) for the leak. Eventually, the fuse would blow again.
But because your fuse blows right away, the pump is likely already seized, and therefore, has failed. Replacing the pump may not fix your whole problem. It would be a first, and very likely necessary, first step toward troubleshooting.
The pump could have failed because it was simply old and worn out. Or, it could have failed from a leak that wore it out. In either case, it looks like you need to replace it. As to whether there is anything else wrong, we simply cannot tell at this point.
Last edited by Skylaw; Nov 15, 2010 at 11:59 PM.
Newbie
Joined: Dec 2008
Posts: 13
Likes: 0
2005 s500 4matic
hello
my 2005 s500 has the same problem. i dont here or feel the pump going on and i have a 20amp fuse under the rear passenger seat that keep blowing. does this mean the pump is broken or can something else blow the fuse?are there any relays for the pump? does anyone have any sugestions?
my 2005 s500 has the same problem. i dont here or feel the pump going on and i have a 20amp fuse under the rear passenger seat that keep blowing. does this mean the pump is broken or can something else blow the fuse?are there any relays for the pump? does anyone have any sugestions?
MBWorld Fanatic!
Joined: Apr 2003
Posts: 1,464
Likes: 9
From: SoCal OC
S, GL, Escalade ESV, my shoes
hello
my 2005 s500 has the same problem. i dont here or feel the pump going on and i have a 20amp fuse under the rear passenger seat that keep blowing. does this mean the pump is broken or can something else blow the fuse?are there any relays for the pump? does anyone have any sugestions?
my 2005 s500 has the same problem. i dont here or feel the pump going on and i have a 20amp fuse under the rear passenger seat that keep blowing. does this mean the pump is broken or can something else blow the fuse?are there any relays for the pump? does anyone have any sugestions?
Replacing the PSE pump ($650 part) fixed the problem. All work well now.
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Newbie
Joined: Jun 2012
Posts: 13
Likes: 2
From: Florida, Palm City
MB S350 2006 220
My fuse did not burn but my pump did. Plastic cover melted by the motor creating 2 holes on the plastic and ooh what a smell. Have new pump now had to reset the fault codes and fix leaks. Front door actuators still leak so am sure to close them manually all the way till I get around and fix them.
Go around the car and listen to leaks on soft close doors and trunk lid. Also listen to lumbar support. Pump should only run about 4-6 seconds after door or trunk is soft-closed. If it runs longer you have a problem and eventually your pump will burn out again. If you hear a hissing sound at the doors or trunk. Close them manually all the way until you fix the leaking soft-close actuator.
Go around the car and listen to leaks on soft close doors and trunk lid. Also listen to lumbar support. Pump should only run about 4-6 seconds after door or trunk is soft-closed. If it runs longer you have a problem and eventually your pump will burn out again. If you hear a hissing sound at the doors or trunk. Close them manually all the way until you fix the leaking soft-close actuator.
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Newbie
Joined: Oct 2019
Posts: 11
Likes: 2
2005 SL500
door lock issue (surprise)
My door locks etc do not work by the fob or interior controls, my seat adjustments work fine (except the lumbar). I hear the pump running in the trunk, I removed the pump and checked the rotor and vanes and they are all intact. I do not know where to go next.
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,474
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Have you reset the PSE computer?
This is done by removing the yellow 20-Amp fuse behind the floor lamp in the carpeted wall behind the right rear passenger's heels. Wait a few seconds, then replace the fuse. If some of the non-functional devices start working again, even temporarily, this indicates that there is a leak in that device. The computer monitors how long it takes for the device to function. If the time exceeds that programmed into the computer, the computer cuts off the device to save the PSE pump. Removing and replacing the fuse resets the computer so it will try that device again.
This is done by removing the yellow 20-Amp fuse behind the floor lamp in the carpeted wall behind the right rear passenger's heels. Wait a few seconds, then replace the fuse. If some of the non-functional devices start working again, even temporarily, this indicates that there is a leak in that device. The computer monitors how long it takes for the device to function. If the time exceeds that programmed into the computer, the computer cuts off the device to save the PSE pump. Removing and replacing the fuse resets the computer so it will try that device again.
