How to Replace the Key Battery for the New Mercedes-Benz Viano 3.0?
2 Answers
From the tail end of the key, push the marked switch upwards, and the hidden mechanical key will pop out slightly. Then, you can remove the mechanical key. Use the extracted mechanical key to press against the marked position, apply a gentle force, and the key shell will open. After removing the key shell, you will find the battery positioned quite deep. Insert any tool into the gaps on both sides and gently pry to remove the old battery. When installing the new battery, ensure the positive and negative poles are correctly aligned.
Recently, I helped a friend replace the battery in their new Mercedes-Benz Viano 3.0 key, and the process was quite straightforward. First, locate the small notch or button on the edge of the key, usually on the back cover. Use a small coin or a thin screwdriver to gently pry it open, being careful not to crack the plastic shell. Inside, you'll find a coin cell battery, typically a CR2032. When removing the old battery, remember the orientation of the positive and negative terminals—it's crucial to have the positive side facing up. Then, insert the new battery, ensure it's firmly seated, and close the key cover. Test it by pressing the buttons a few times to unlock the car.
Why replace the battery? When the key buttons become unresponsive or the car doesn't react, it's likely due to a depleted battery. It's advisable to buy high-quality branded batteries to avoid leakage from cheap ones, which can damage the key's circuitry. Additionally, Mercedes-Benz keys are designed with precision, so ensure your hands are dry during the process to prevent static interference. Keeping a spare battery in your car is also a good idea—if the key fails during a trip, you can handle it yourself.
