Cost to have dealer replace PSE? (Vacuum unit for locks)
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 25
Likes: 5
S 550
Cost to have dealer replace PSE? (Vacuum unit for locks)
I have a pristine 2003 Mercedes S430. It was a one owner car, and (long story) I inherited it from a relative.
None of the door locks work and the trunk wont open. It just happened recently. Thinking it needs a new PSE unit.
If I take this to a Mercedes dealer, how much will it likely be to repair?
If I get the same unit out of a junkyard, will it work? I hear conflicting stories if it will swap in without reprogramming.
Thanks for the help.
None of the door locks work and the trunk wont open. It just happened recently. Thinking it needs a new PSE unit.
If I take this to a Mercedes dealer, how much will it likely be to repair?
If I get the same unit out of a junkyard, will it work? I hear conflicting stories if it will swap in without reprogramming.
Thanks for the help.
Super Member
Joined: May 2021
Posts: 554
Likes: 150
From: Netherlands
CL 600 '00 5.8L V12
Disconnect the battery for a while and then reconnect it.
I think it should pop back into life for a brief period.
You probably have a vacuum leak somewhere in the system, which causes the pump to go into protect mode, as it isn't designed to run for minutes at a time, but rather seconds
I think it should pop back into life for a brief period.
You probably have a vacuum leak somewhere in the system, which causes the pump to go into protect mode, as it isn't designed to run for minutes at a time, but rather seconds
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,474
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From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
Have you checked the fuse?
Look in the right rear passenger area for the floor lamp behind the passenger's heels. Pry it out of the carpeted wall - don't bother disconnecting it. Behind the lamp, find the yellow 20-Amp fuse. If it has blown, replace it with a good name-brand 20-Amp fuse. If not blown, reinsert it.
Removing and reinserting the fuse resets the PSE system. If a function works for a few times, then stops working, there is probably a leaking pneumatic actuator on that function. If a function - for example, locking/unlocking the driver's door - takes longer to complete than the programmed time, the PSE control system will quit doing that function to protect the system pump.
Look in the right rear passenger area for the floor lamp behind the passenger's heels. Pry it out of the carpeted wall - don't bother disconnecting it. Behind the lamp, find the yellow 20-Amp fuse. If it has blown, replace it with a good name-brand 20-Amp fuse. If not blown, reinsert it.
Removing and reinserting the fuse resets the PSE system. If a function works for a few times, then stops working, there is probably a leaking pneumatic actuator on that function. If a function - for example, locking/unlocking the driver's door - takes longer to complete than the programmed time, the PSE control system will quit doing that function to protect the system pump.
Super Member
Joined: Jun 2018
Posts: 533
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From: Northern Hemisphere - Chicago
fleet
it costs too much to justify the cost.
i bought a used 100 "working one" but did find out i had a leak in trunk release so new pump was not neededGenuine Mercedes Vacuum Power Supply Pump; New
Mercedes S500, S430, S600, S55 AMG, CL500, CL55 AMG, CL600, S350, S65 AMG, S600 Sedan & more
$666.99
i bought a used 100 "working one" but did find out i had a leak in trunk release so new pump was not needed
Genuine Mercedes Vacuum Power Supply Pump; New
SKU: 1440104-2208001248 | 2208001248
Mercedes S500, S430, S600, S55 AMG, CL500, CL55 AMG, CL600, S350, S65 AMG, S600 Sedan & more$666.99
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 25
Likes: 5
S 550
it costs too much to justify the cost.
i bought a used 100 "working one" but did find out i had a leak in trunk release so new pump was not neededGenuine Mercedes Vacuum Power Supply Pump; New
Mercedes S500, S430, S600, S55 AMG, CL500, CL55 AMG, CL600, S350, S65 AMG, S600 Sedan & more
$666.99
i bought a used 100 "working one" but did find out i had a leak in trunk release so new pump was not needed
Genuine Mercedes Vacuum Power Supply Pump; New
SKU: 1440104-2208001248 | 2208001248
Mercedes S500, S430, S600, S55 AMG, CL500, CL55 AMG, CL600, S350, S65 AMG, S600 Sedan & more$666.99
Is there an easy way to troubleshoot if it's the trunk release that's leaking?
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 25
Likes: 5
S 550
Have you checked the fuse?
Look in the right rear passenger area for the floor lamp behind the passenger's heels. Pry it out of the carpeted wall - don't bother disconnecting it. Behind the lamp, find the yellow 20-Amp fuse. If it has blown, replace it with a good name-brand 20-Amp fuse. If not blown, reinsert it.
Removing and reinserting the fuse resets the PSE system. If a function works for a few times, then stops working, there is probably a leaking pneumatic actuator on that function. If a function - for example, locking/unlocking the driver's door - takes longer to complete than the programmed time, the PSE control system will quit doing that function to protect the system pump.
Look in the right rear passenger area for the floor lamp behind the passenger's heels. Pry it out of the carpeted wall - don't bother disconnecting it. Behind the lamp, find the yellow 20-Amp fuse. If it has blown, replace it with a good name-brand 20-Amp fuse. If not blown, reinsert it.
Removing and reinserting the fuse resets the PSE system. If a function works for a few times, then stops working, there is probably a leaking pneumatic actuator on that function. If a function - for example, locking/unlocking the driver's door - takes longer to complete than the programmed time, the PSE control system will quit doing that function to protect the system pump.
