How to Replace the Battery in a Mercedes-Benz S400 Diesel Key?
2 Answers
Method for replacing the battery in a Mercedes-Benz S400 Diesel key: 1. Pull the key on the side while pressing the clip to release it, then remove the mechanical key; 2. Insert the mechanical key into the gap to open the battery cover; 3. Remove the old battery and replace it with a new one; 4. Reassemble by following the steps in reverse. The Mercedes-Benz S400 Diesel has dimensions of 5042mm in length, 1854mm in width, and 1445mm in height, with a wheelbase of 2964mm, a trunk capacity of 498 liters, and a curb weight of 1990kg. In terms of safety features, this model is equipped with an Anti-lock Braking System (ABS), Electronic Brakeforce Distribution (EBD), Emergency Brake Assist (EBA), Electronic Stability Program (ESP), and side-impact door beams.
Last time I helped a customer replace the battery in their Mercedes S key, it's actually not difficult. First locate the small groove on the side of the key, use a coin to wedge in and gently twist to separate the casing. The small silver disc inside is the battery, model CR2032. Be careful not to use metal tools when removing the battery as it may scratch the circuit board. When installing the new battery, pay attention to the orientation - the side with lettering should face upwards aligned with the spring contact. I usually take the opportunity to clean the contacts with a cotton swab to remove sweat residue and prevent poor contact. After installation, remember to long-press the lock button to test the signal - if the car lights flash, it's working fine. While the $5 batteries from roadside auto parts stores will work, the OEM ones last longer.
