2005 E500 4matic PSE Pump

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11-09-2010, 11:01 AM

andrew9147

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2005 E500 4matic PSE Pump

Does anyone know where the PSE Pump is located on an 2005 E500?

11-09-2010, 08:41 PM

raymond~

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Location: Seattle WA USA

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my guess is in trunk, left side

11-11-2010, 09:08 PM

MB Canada Tech

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Don't think this vehicle has a PSE pump

11-15-2010, 09:00 AM

raymond~

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Location: Seattle WA USA

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you may be correct, and if so, how does his front dynamic seats function w/o PSE pump?

11-16-2010, 06:28 AM

andrew9147

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PSE pump overpressure valve

There is indeed a PSE pump. It is located in the trunk on the driver's side and adjacent to the rear lamp. The problem is that my lumbar supports will inflate for about 30 minutes and then deflate. If I turn the ignition off and then restart the car, the bladders will inflate for another 30 minutes or so. The door locks and trunk release which are also dependent on this pump don't have an issue. I have inspected the lines and fittings at the pump and in the seats and there does not appear to be an obvious leak. So, I am wondering if the overpressure valve that may malfunctioning. If so, does anyone know the PSI provided by the pump and can the valve be replaced?

07-09-2011, 04:49 PM

e320mike

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e320 seat deflates

i have the same problem wih the drivers seat on my 2001 e320 wagon. after 10minutes several sections if the seat deflate and will not re-inflate until i restart the car.. any ideas?

07-10-2011, 09:38 AM

chassis221

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usually the problem is the bladders in the seat itself.

07-23-2011, 03:26 PM

jvbutter

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I would look to getting a pressure gauge on the seat bladders.... test them for pressure, pinch off the supply line to see if the bladders have a hole, or is the checkvalve letting air back into the pump