Not sure if this is or was an option but on my 97 S500 the driver and passenger front seats (lumbar) go through some sort of inflation and deflation sequence in a simultaneous fashion.

It is sorta creeping my old lady out so I told her I'd try and see if anyone here on the board might know how to fix it.

thanks and yes I've been gone from here for some time I must admit.

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Chas

Had a 380SL, 450SL, 380SEL, 420SEL, 500SEL

Got a Euro 500SEC right now.