Went to put my top up on Mercedes cabriolet parked in my driveway. With the key on and the vehicle turned off, in park, parking brake on, pressed closure button. During closure headrests began to raise. Not a sudden pop up kind of raising, but a slow, steady raising, as if I had my hand on the button to raise them, yet I did not. It's on the dash, and I was the only one in the car, and had no items in the car either. For the record, while female, I grew up racing cars, have changed my own engine, turbo, transmission, shocks, springs, etc. These two seat and top processes are mutually exclusive so then neither would work. Clearly up they greatly impact visibility plus the top will not go up. Secondly to get the top over the headrests, according to the manual it's impossible, but said another way, it's a four person job. Given the limited visibility of the cabriolet top up anyway, adding the raised headrests, now it's a serious safety issue. The top blocks 2/5 of the visibility. The headrests up block 2/5 of the visibility. All that is left is the 1/5 between them - a very narrow range of view. At the dealership, they know exactly what it is.they say when they deploy falsely it's like airbags and they cannot just go back down and they replace a number of these. If this is supposed to deploy in the event of a rollover or accident, for this to deploy without hitting anything, yet to impact visibility with no way to return to normal visibility or protect yourself from the elements, surely this is a safety issue. This seems much akin to the airbags falsely deploying. The car was not turned on, not moving, had not hit anything, and had not been driven in a half hour. For the dealership to instantly recognize what it was, what part it needed, how the seats needed to come out to fix it, etc. Shows this is not an isolated safety incident and should make it a recall item.

- Austin, TX, USA

Drivers power seat control module drains battery when auto is parked.

- Plano, TX, USA

Power seat controller becomes defective and fails to shut down when car is off and locked, and thus drains the battery.

- Baton Rouge, LA, USA

Defective seat controller modules ( driver and passenger ) cause the battery to drain completely within 24 hours. This leaves me stranded and unable to drive my vehicle. A search online reveals multiple other with the same issues...indicating an obvious safety issue that is well known to the manufacturer with no resolution to this problem from the manufacturer other than paying $1000 for a known defective issue/part.

- Whitmore Lake, MI, USA

Seat control module on passenger side drains the battery.

- Houston, TX, USA

Seat controller modules, they constantly drain the battery when the car is off. This is a very very common problem with Mercedes C class. The controller drains the car battery to the point were the car cannot start, and continues to do this if the car is not driven everyday. Obviously having a car battery get sucked below 3V is not healthy for the battery, and in the end everyone with this problem has to replace their battery many many times.

- Rittman, OH, USA