Replacing the remote control battery (auxiliary warm-air heater)
DANGER Risk of fatal injuries due to swallowing batteries
Batteries contain toxic and corrosive substances. Swallowing batteries may cause severe internal burns within two hours.
There is a risk of fatal injuries.
Keep batteries out of the reach of children.
If the battery cover does not close securely, do not continue to use the remote control, and keep it out of the reach of children.
If batteries are swallowed, seek medical attention immediately.
ENVIRONMENTAL NOTE Environmental damage due to improper disposal of batteries
Batteries contain toxic and corrosive substances.
Take discharged batteries to a qualified specialist workshop or to a collection point for used batteries. Requirements
A CR2430 lithium battery is available.
Mercedes-Benz recommends that you have the battery replaced by a qualified specialist workshop.
Turn battery cover 
anticlockwise using a suitable object, e.g. a coin, and remove it.
anticlockwise using a suitable object, e.g. a coin, and remove it. Check the seal on battery cover for damage and replace it if necessary.
for damage and replace it if necessary. Remove battery 
.
. Insert a new battery into the battery compartment with the positive terminal facing upwards.
into the battery compartment with the positive terminal facing upwards. Use a lint-free cloth to do so.
Position battery cover so that mark 
on the raised area points between two recesses 
.
so that mark on the raised area points between two recesses . Turn the battery cover clockwise as far as it will go.
Check all the functions of the remote control.