p911sc

New member here. I have a 2007 c280 4matic. Recently my front passenger seat stopped working. When I press any of the door mounted controls, I can hear a clicking under the seat but no response from the seat. There is a box. I am guessing this is a seat control module. The clicking occurs with each of the controls (Headrest, Back, or slider). I have checked the 3 fuses designated for control of the passenger seat (1, 22, and 34). All three fuses are fine. However, with the key out of the car and the driver’s side door open, I have 12V to fuse 22, 0.9 Volts to fuse 34, and 0 Volts to fuse 1. Does anyone have the wiring diagram that shows the wiring for the seats or ideas on things to check. It seems like the problem could be a relay or the seat module itself. I greatly appreciate any help you can provide.
Thanks in advance.
Rick

ggms16

Hi Rick. Have you checked the if the motors are getting 12V when you are activating them?

p911sc

ggms,
Thanks for the reply. Sorry to be so long responding, I am just getting back from vacation.
I have not checked voltage to the motors. I made the assumption (though maybe wrong) that since none of the seat positions worked that it wasn't the motors. I'll check tomorrow. Does anyone know if disconnecting the seat wires sets off the airbag light? I took the seats out of another car and had this problem. Had to go to the mechanic to have the light reset.