How to Replace the Battery in a Mercedes-Benz S320 Key?

[AshleyLee]

Mercedes-Benz S320 key battery replacement method is: 1. Press the button on the back of the key; 2. Push the back cover of the key forward to open it; 3. Replace the battery in the slot and reinstall the key back cover. Functions of the car key: 1. After the vehicle is turned off, long-press the lock button on the remote key to close the windows; 2. The red horn-shaped button on the key serves both to locate the car and as an emergency function; 3. It has an automatic trunk opening feature. Principle of the car key: The owner emits a weak radio wave, which is received by the car antenna. The electronic control unit (ECU) identifies the signal code, and the system's actuator motor or electromagnetic coil performs the unlocking or locking action.