W140 PSE Pump Connector Wiring Diagram - PeachParts Mercedes-Benz Forum

JFawcett · #1 07-19-2008, 07:53 AM

1997 S-500.
Can anyone send me a wiring diagram of the PSE Connector and which wire goes where (the plug has about 20 or so wires)? The behavior I am getting leads me to believe that there is a crossed wire in the connector somwehere. The pump is about a year old.

ALSO, if it is determined that a wire is astray - how do you go about putting it back together? How do you hold all those wires together in the right positions to get them back in the plug?

Thanks!

duxthe1 · #2 07-19-2008, 12:15 PM

I'd expect a crossed vaccum line long before a crossed wire in the connector. It is quite difficult to get the connector apart and very easy to plug the line into the wrong port.

JFawcett · #3 07-19-2008, 01:56 PM

The pump is working, but there are some strange things going on.
Example, the back seat headrests won't go down and I am getting a code that is about the PSE pump and the reverse antenna (my car doesn't have reverse antenna).
When I bought the car, the door locks weren't working - so I had them fix it (not a benz dealer). I suppose they could have put the wrong pump in car? BUT I don't think so.
Also, the connector is missing the locking collar - the wires are all together and in the plug, but the connector is not locked to the pump.....so want to verify wires are where they should be.

duxthe1 · #4 07-19-2008, 02:05 PM

There IS an early and a late pump, I'd get the part # off of the pump you currently have and run it through the EPC to see if indeed they installed the wrong one, it kinda sounds like they did.