richard morris check this video and see if it works for your model as well. Or you can try what works for the 2000 CLK . You can reset them with the button that you normally use to adjust your headrest. To reset the rear headrest, which MB calls a roll bar, press the upper half of the button and hold it for 8 seconds until you hear the mechanism engage, then press the lower half of the button to lower the headrests.