How to change fob battery W204
Hi here is my recorded step to change the fob battery (CR2025) 2 units Step 1: flip this switch to remove the physical key from the fob Step 2: pull the physical key out Step 3: User the end of the physical key as a handle to flip the inner switch of the fob, and (green arrow) slowly pull the cover, it comes out with the battery and the circuit board.