2003 Mercedes C-Class Owner's Manual - Page 86

Controls in detail Locking and unlocking ! If you can no longer lock or unlock the vehicle with the key, then either the batteries in the SmartKey are discharged, the key is malfunctioning or the vehicle battery is drained. Check the batteries in the key ( page 86) and replace them if necessary ( page 286). Use the mechanical key to lock and unlock the doors ( page 285) and the trunk lid ( page 91) as required. Check the vehicle battery ( page 303) If the key is malfunctioning, contact an authorized Mercedes-Benz Center. Checking the batteries Press button ‹ or Œ. Battery check lamp 5 lights up briefly to indicate that the key batteries are in order. Unlocking the trunk lid You can unlock the trunk separately. A minimum height clearance of 5.75 ft. (1.75 m) is required to open the trunk lid. Press button Š until trunk opens. ! If battery check lamp 5 does not light up briefly during check, then the key batteries are discharged. Replace the batteries ( page 286). You can obtain the required batteries at any authorized Mercedes-Benz Center. ! The trunk lid swings open upwards automatically. Always make sure that there is sufficient overhead clearance. The trunk can also be opened from its inside in an emergency, see "Trunk lid emergency release" ( page 89). i If the vehicle was previously centrally locked, the trunk lid will lock automatically when closed ( page 89). The turn signals will flash three times to confirm locking. If the trunk lid was previously separately locked ( page 90), the trunk lid will remain locked. 86