With my G 270cdi the headrest only drives up but not down as soon as I press through the switches in the door panel. But if I press old memory settings the motor still drives down the column. But not if I want to manually adjust by switch. The motor is therefore fine. I then got a new switch unit for the door and built in, no change. What I noticed was that a relay at the switch clicks when I manually up the column The click does not stop when I drive down the support. So I switched the control units of the seats with each other (it’s funny, then you press the driver’s seat with the passenger switch unit and vice versa). Then both of the coops went up and down to adjust. ECUs returned to the right sides and both supports still went to adjust. Some kind of contact error is probably to blame. By the way, it is always a relay click to hear, with each the adjustment. Everything is installed again also the door panel, and what was exactly, the headrest of the passenger side drives again only up and not down. Then both control units exchanged again, this time also driver seat (with the control unit of the passenger seat and with switch actuation in the passenger door) the support only up and not down. What can that be? I think either the control unit really has a crack (possibly the relay) or a cable from the Scha It’s possible with this CAN bus thing, because no fixed assignment) has some kind of wobbler. While all the cables don’t look like it, they don’t wake up and shake. Can you check the control unit, I just hate to get another one if it’s not at all. Alternatively, I can leave it as it is, but somehow it doesn’t leave me alone. Who has an idea?