n20mrp

hi Guys and girls,
i need some advise/help with the drivers side (UK) Lumbar support not working.
the passenger side works fine but when you try to adjust the drivers side the bar on the screen just drops back to 0., no noise from the pump either so if it was a hose i would expect to hear the pump engage initially?

its a 2008 cl500 w216.
any tips/advise etc would be greatly appreciated

best regards
N20mrp

Television

This is an odd fault,and looks like the controller fault, if it was a bladder/valve block fault it would still try and do what you ask