Changing the battery

You require a CR 2025 3 V cell battery.

  • Take the mechanical key out of the SmartKey ().

  • Press mechanical key 2 into the opening in the SmartKey in the direction of the arrow until battery tray cover 1 opens. When doing so, do not hold cover 1 shut.
  • Remove battery tray cover 1.

  • Repeatedly tap the SmartKey against your palm until battery 3 falls out.
  • Insert the new battery with the positive terminal facing upwards. Use a lint-free cloth to do so.
  • Make sure that the surface of the battery is free from lint, grease and all other forms of contamination.
  • Insert the front tabs of battery tray cover 1 and then press to close it.
  • Insert the mechanical key into the SmartKey.
  • Check the function of all SmartKey buttons on the vehicle.
    See also:

    Step-by-step instructions
    The following steps have been developed as required of all manufacturers under Title 49, Code of U.S. Federal Regulations, Part 575 pursuant to the "National Traffic and Motor Vehicle Saf ...

    Haven of calm: optimum vibration and acoustic comfort
    The new M-Class promises relaxed and therefore safe motoring under all possible (and even impossible) conditions. By paying close attention to detail every step of the way, the development enginee ...

    Replacing the rear window wiper blade
    Removing the wiper blade WARNING The wiper arm could be set in motion and injure you if the wiper is switched on. Remove the key from the ignition lock before replacing the wiper blade. - R ...