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:
Deactivating the HOLD function
The HOLD function is deactivated automatically if:
• you accelerate and the transmission is in position D or R.
• you shift the transmission to position P.
• you apply the brakes again with a certa ...
Front-end structure: crumple zone on four levels
Compared to the previous model series, the Mercedes engineers have further
enlarged the deformation zones substantially in the front and rear sections of
the new CLS, as well as improving the ener ...
Fuse box in the engine compartment
Make sure that the windshield wipers are
turned off.
WARNING
Make sure that the windshield wipers are
switched off and that the SmartKey is
removed from the ignition lock before you
...
