The lumbar supports in the seats of my 300SL do not seem to work when I move the controls but at times they pump up in both seats while driving.

Has anyone expereinced this problem?

How does the system work?

sldan

That system is a demand system. IF you "open" the control valve(switch) the system senses lower pressure & runs the pump to BUILD back the system pressure. When the pump reaches & holds that pre-determined pressure it will shut-off.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

Thanks M.B Doc,

Does all of the control take place in the unit with the thumb wheels located on the side of the seats?

Is there a way to test the system?

It appears to me that the ballons, for lack of a better word, are collasped all of the time until they magically pump up for a while while driving.

Should the ballons react quickly to a change in the thumb wheel setting or is there a time delay before I should expect to feel a change?

sldan