If you have difficulty resetting the NECKPRO luxury head restraints, have this work carried out at a qualified specialist workshop, e.g. an authorized Mercedes- Benz Center.

Remove resetting tool 1 from the vehicle tool kit in the trunk.
Slide resetting tool 1 into guide 2 between the NECK-PRO luxury head restraint and the rear cover of the head restraint.
Push resetting tool 1 downwards until you hear the head restraint deployment mechanism engage.
Pull out resetting tool 1.
Firmly press the NECK-PRO luxury head restraint cushion back 3 until it engages.
Repeat this procedure for the second NECK-PRO luxury head restraint.
Put resetting tool 1 back into the vehicle tool kit.