W140-PSE pump

[jylee]

The power doors and trunk handle failed a few days ago. Today, I removed the pump and reviewed a broken nipple on the P + Pressure connection, it is also the first one I pulled. I don't think I caused the broken nipple, prior to pulling the connector, I hear a single click whenever I push to open/close doors. I also hear air noise when the engine is running.

Will this broken nipple cause the failure?

Jack

[jylee]

I used some vacuum to connect the broken nipple, but it does not work.

The motor clicks when I turn on/off the doors.

What's next, does anyone know how to repair the pump.

Jack

[Peter Guenther]

P+ is pressure for the lumbar, P- is vacuum for HVAC. I dont know of anyone who has successfully repaired a pump for any extended period of time. I would pull the plug on the pump wait for a few moments and power up. The pump has a safety if it runs too long it diasbles it, if you cant hear the motor run ...well. The pump provides constant pressure for the lumbars, provides vaccum for the engine/AC/ when accelerating or at "rest". ZV is switched vacuum / pressure for lock and unlock, pressure to unlock, vacuum to lock. SFG is for the lid grip. You are probably hearing the relay(s), but not the motor.

[syljua]

I also have problems with this pump.
I see that the P+ pressure connection is divided into 3 pipes.

Look at this picture (blurry cellphone image taken in my 1997 S320)



I think I have read somewhere that;

The yellow ones are for ZV and boot.
The single white is vacuum from engine.
The black are vacuum back to HVAC.
The double white are for read headrest?
The disconnected pipe (not shown) are the grey one beeing divided into 3 grey ones on the left for the lumbar.

Why 3 for lumbar? (there are only 2 seats?) Am I loosing something else
here?

How does the rotaty dial on the seat regulate the pressure on
the lumbar support?

My pump does not give pressure on this connection at all. Even
after disconnecting it for a while. But all the other functionallity works
like ZV, HVAC and rear head rests down.

br,
syljua

[rsmcmahon]

The vacuum lines are grouped together as follows:
Clear = Vacuum supply from engine (1) to fit to a one way connector
Black = trunk handle eject/retract (1) to fit to a one way connector
Red = Rear parking aide antennae (2) to fit to the two way connector
Yellow = Central locking (6) to fit to the six way connector
Grey = Front seat lumbar (3) to fit to the six way connector with 3 vacuum plugs
White/blue = Rear headrests (2) to fit to the two way connector

[syljua]

Yes, but my 1997/1998 car has PTS (no parking antenna) and the new AC.
Does not this unit give vacuum to the AC when engine is not running?

The number of yellow ones does not make sense.

And why are the lumbar given vacuum, not pressure?

br,
syljua