learn opening door for irkeys MB

[chakahafed]

hello
the battery of my ir keys is dead ,
i can start the car but i can't open doors whth radio
how to lern radio code for the key ?
car is : w 203 220 CDI
regards

[Qrius]

hello
the battery of my ir keys is dead ,
i can start the car but i can't open doors whth radio
how to lern radio code for the key ?
car is : w 203 220 CDI
regards

New battery in key will do , if you say there dead !!
ir key will start without any need of battery
rf signal (radio) needs the battery only