2009 Mercedes CL-Class Owner's Manual - Page 543

Practical hints Replacing SmartKey batteries Locking the vehicle If you cannot lock the vehicle with the SmartKey or with KEYLESS-GO, lock it as follows: X Close the driver's door and the trunk. i This procedure does not arm the antitheft alarm system, nor does it lock the fuel filler flap. Replacing SmartKey batteries 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. i If you cannot close the trunk with the remote trunk opening/closing switch, lower the trunk lid manually and close it with hands placed flat on the trunk lid until it is engaged in its lock. X Open the passenger door. X Press down the locking knob of the driver's door manually. X Press down the locking knob of the passenger door. ! To prevent inadvertent lockout, make sure to have the SmartKey with you before proceeding with the next step. The next step will lock the vehicle. X X G Warning! 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. Batteries contain materials that can harm the environment if disposed of improperly. Recycling of batteries is the preferred method of disposal. Many states/provinces require Exit the vehicle. Lock the trunk with the mechanical key (Y page 300). X Close the passenger door. Z 541