2010 Mercedes ML-Class Owner's Manual - Page 311

Replacing SmartKey batteries Resetting activated NECK-PRO active front head restraints If the NECK-PRO active front head restraints have been triggered in a rear-end collision, they must be reset. You can tell that the NECK-PRO active front head restraints have been triggered when they have been moved forward and cannot be adjusted. X 309 Firmly press the top of the head restraint cushion towards the head restraint cover in direction of arrow = until it engages. X Repeat this procedure on the NECK-PRO active front head restraint for the second front seat. For information on NECK-PRO active front head restraints, see "NECK-PRO active front head restraints" (Y page 53). G Warning! G Warning! When pushing back the head restraint cushion, make sure your fingers do not become caught between the head restraint cushion and the cover. Failing to do so may lead to injury. If the batteries in the SmartKey are discharged, the vehicle can no longer be locked or unlocked. It is recommended to have the batteries replaced at an authorized Mercedes-Benz Center. G Warning! i Pressing the head restraint cushion back requires high force. If you encounter difficulties when pushing the head restraint back, please have the procedure performed at an authorized Mercedes-Benz Center. Batteries contain poisonous and corrosive substances. Therefore, keep the batteries out of reach of children. If a battery is swallowed, seek medical help immediately. G Warning! SmartKey batteries contain perchlorate material, which may require special handling and regard for the environment. Check with your local government's disposal guidelines. California residents, see www.dtsc.ca.gov/ HazardousWaste/Perchlorate/ index.cfm. X Pull the top of the head restraint cushion in direction of arrow : as far as it will go. X Adjust the head restraint cushion downward in direction of arrow ; as far as it will go. Batteries contain materials that can harm the environment if disposed of improperly. Recycling of batteries is the preferred method of disposal. Many states (USA only) or provinces (Canada only) require sellers of batteries to accept old batteries for recycling. When inserting the batteries, make sure they are clean and free of lint. When replacing batteries, always replace both batteries. Z Practical hints For safety reasons, have the NECK-PRO active front head restraints checked at an authorized Mercedes-Benz Center after a rear-end collision. Replacing SmartKey batteries