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Old 09-14-2003, 12:00 PM
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Join Date: Jul 2003
Location: Tulsa
Posts: 304
PSE Pump/Central Locking Problem

I have a 92 400SE W140 that yesterday the Central Locking System stopped working. I first checked the fuses in the rear of the car and discovered the fuse (F4 # 9 20amp) had blown. What is interesting F4 # 9 specifically controls the “closing assist” function while F4 #3 fuse controls central locking, closing assist, and the PSE control module. I replaced the blow fuse and the central locking system worked for a few minutes before the fuse burned out again. I could hear the PSE pump under the rear seat running when I attempted to activate the central locking system. I replaced the blow fuse again (F4 # 9) but now the PSE pump does not run. I you attempt to use the Central Locking System, you will only hear a single, faint click noise coming from the PSE pump – no motor running. The door and trunk Closing Assist work fine, but none of the PSE controlled modules work.

Since the PSE only makes a faint, single click noise, is the PSE blown and needs to be replaced? Does anyone know why the fuse was blown on F4#3 for closing assist when the PSE pump (PSE is controlled by F4 #9) is not controlled by this fuse?

I also checked the vacuum lines that connect to the PSE pump and all connecting lines with the exception of 3 will hold a vacuum without loosing pressure. Do you think these 3 lines caused the PSE pump to fail due to overwork?
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PSE Pump/Central Locking Problem-pse-pump.jpg  
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Old 09-14-2003, 12:57 PM
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Annelid wrangler
Join Date: Apr 2002
Location: Fountain Hills, AZ
Posts: 4,932
I can tell you that the vacuum pump in question has a rather high failure rate. It's definitely a big seller.

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Old 09-14-2003, 03:32 PM
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Join Date: Jul 2003
Location: Tulsa
Posts: 304
I just went to get gas and the fuel door is locked in the close position because the PSE pump has quit. I'm unsure of which vacuum hose ( + or - ) pressure applied will relase the fuel door. As you can imagine, I'm really starting to get frustrated with the 400SE!@@

Is removing the rear seats and appling (vacuum or pressure) my only option to open the fuel door?
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Old 09-16-2003, 02:17 PM
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Join Date: Jul 2003
Location: Tulsa
Posts: 304
Does anyone know the "replacement" part number for the PSE pump listed above in the picture? I was told the part has been replaced with a newer "universal" pump. Is this true?

Thanks for any feedback.
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Old 09-16-2003, 03:45 PM
Join Date: Jan 2003
Location: Florida
Posts: 1,084
fuel door

I think there is a pull (handle) on the assembly to retract it from the trunk. I also belive it is the extra yellow line from the pump, that also controls the gas door and the trunk handle, the other yellow controls lock/onlock on the doors. I was under the opinion there is a universal replacement pump with a separate distributor plate which can be adapted for you needs.

Last edited by Peter Guenther; 09-16-2003 at 04:10 PM.
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