2009 Mercedes S-Class Owner's Manual - Page 101

Controls in detail Seats X Pull the head restraint forward until it locks into position. Removing and installing rear seat head restraints (vehicles with split rear seat bench only) with the letter "M" on the outside of the metal bars. X Make sure the head restraints engage fully. Wagon Folding rear seat head restraints back (rear outer seats only) 1 Head restraint release switch X Switch on the ignition. X Press the symbol-side on switch 1 to release the head restraints. Placing rear seat head restraints upright 1 Release catch X Removing: Fold the seat backrest forward (Y page 205). X Fold back head restraint (Y page 98). X Press head restraint release catch 1 and pull the head restraints out of the guides. X Fold the seat backrest back to its original position. X Installing: Insert head restraint and push it down until it engages. X Make sure you place the correct head restraint on the middle seat. It is marked 1 Release button X Press release button 1 and fold the head restraints backward. Z 99