W220 2002: multicontour seat and lumbar not working. No leaks. There is no fault codes either. Have changed the PSE-pump and a control unit 2208001278.
When trying to initialize the control unit, it does not allow to do it. Just hangin forever. The same with the old control unit.

SDS screenshot.
All other functions on the seat works, but no massage or lumbar.
Any advice, thank`s

I'm having the same issue in my 04 S55, hot/cold works, power everything works, but the dynamic/massage does not work. Never looked into it but i'll be following for info.

Massage, lumbar etc comes from PSE-pump. I do not have dynamic seat, but I quess that has it`s own pump.
In my case the PSE-pump does not get signal in order to operate the seat bladders, which are not leaking.
And yes, it is coded correct.
The system is very complicated and overengineered.