2005 Mercedes S-Class Owner's Manual - Page 97

Controls in detail Locking and unlocking Restoring to factory setting Press and hold buttons Œ and ‹ simultaneously for about six seconds until battery check lamp 5 flashes twice. If the SmartKey is malfunctioning, contact an authorized Mercedes-Benz Center. Checking the batteries Press button ‹ or Œ. Battery check lamp 5 comes on briefly to indicate that the SmartKey batteries are in order. Unlocking and opening the trunk You can unlock and open the trunk separately. A minimum height clearance of 6 ft. (1.85 m) is required to open the trunk lid. Press and hold button Š until trunk unlocks and begins to open. ! If you can no longer lock or unlock the vehicle with the SmartKey, then either the batteries in the SmartKey are discharged, the SmartKey is malfunctioning or the vehicle battery is drained. Check the batteries in the SmartKey and replace them if necessary ( page 387). Use the mechanical key to unlock the driver's door ( page 383) and trunk ( page 384). Use the mechanical key to lock the driver's door ( page 383). Have the vehicle battery and the battery connections checked ( page 403). ! The trunk lid swings open upwards automatically. Always make sure that there is sufficient overhead clearance. Vehicles with trunk lid opening/closing system*: To stop the opening procedure, press button Š. The trunk lid stops moving. i If battery check lamp 5 does not come on briefly during check, then the SmartKey batteries are discharged. Replace the batteries ( page 387). You can obtain the required batteries at any authorized Mercedes-Benz Center. i If the batteries are checked within signal range of the vehicle, pressing the ‹ or Œ button will lock or unlock the vehicle accordingly. 95