What to Do When a Mercedes Key Battery Dies?

[CalebFitz]

When the battery in a Mercedes key dies, simply replace it. The replacement method is as follows: 1. Press the button on the back of the key; 2. Slide the back cover forward to open it; 3. Replace the battery in the slot and reattach the back cover. Functions of the car key: 1. After turning off the engine, holding down the lock button on the remote key can close the windows; 2. The red horn-shaped button on the key serves both as a car locator and an emergency signal; 3. It features an automatic trunk opening function. Principle of the car key: The owner emits a weak radio wave, which is received by the car's antenna. The electronic control unit (ECU) identifies the signal code, and the system's actuator (motor or electromagnetic coil) performs the locking or unlocking action.