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Thread Starter
Junior Member
Joined: Sep 2017
Posts: 41
Likes: 1
From: Birmingham, AL
2003 s500 (W220) Base
Unfortunately, if there is corrosion in the rear SAM, it is virtually certain that there is also corrosion in the main power circuits under the right front passenger carpet. There will be no trace of moisture or problems in the carpet. The problem will be under the aluminum panel under the thick padding and sound-proofing under the carpet. You will probably need to remove the seat and the carpet sp you can completely dry the padding and sound-proofing, and so that you can clean and check every electrical connection in the area. Remember that these cables are hooked directly to the battery terminal, and a short circuit to ground can be catastrophic!!.
I don't remember whether or not we have gone thru this, but anyway...
Look in the right rear floor area, and find the floor lamp located behind the right rear passenger's heels. Pull the entire light unit from the rear wall - it is not necessary to unplug it, just move it out of the way.
Look at the row of exposed fuses, and find the yellow 20-Amp fuse located toward the inboard end of the row.
Remove it, wait a few seconds and put it back in. Replace the lamp unit.
This resets the control unit for the PSE (Pneumatic Service Equipment) system. If some of the stuff now works, that tells you that there was problem with that particular service. If, after a few uses, the service quits working, that tells you that there is still a problem with that service. (The PSE control system will try the service a few times, then shut it off again if there is still a problem.)
I don't remember whether or not we have gone thru this, but anyway...
Look in the right rear floor area, and find the floor lamp located behind the right rear passenger's heels. Pull the entire light unit from the rear wall - it is not necessary to unplug it, just move it out of the way.
Look at the row of exposed fuses, and find the yellow 20-Amp fuse located toward the inboard end of the row.
Remove it, wait a few seconds and put it back in. Replace the lamp unit.
This resets the control unit for the PSE (Pneumatic Service Equipment) system. If some of the stuff now works, that tells you that there was problem with that particular service. If, after a few uses, the service quits working, that tells you that there is still a problem with that service. (The PSE control system will try the service a few times, then shut it off again if there is still a problem.)
@wallyp i pulled that fused waited one minute and things did not go back to normal.
Thread Starter
Junior Member
Joined: Sep 2017
Posts: 41
Likes: 1
From: Birmingham, AL
2003 s500 (W220) Base
@wallyp what is the process for getting to the main service? I know you said possibly pulling the seat and examining under the passenger carpet. Is that correct?
MBWorld Fanatic!
Joined: Dec 2012
Posts: 2,474
Likes: 439
From: Ball Ground, GA (N of Atlanta)
2003 S500 2007 GL450
This might help. Odds are that you will only need to remove the right side. If there is standing water under there, you will also need to remove the right rear carpet.
https://mbworld.org/forums/c-class-w...nt-carpet.html
https://mbworld.org/forums/c-class-w...nt-carpet.html
