How to Replace the Battery in a Mercedes Remote?
2 Answers
Here is the method to replace the battery in a Mercedes remote: 1. From the tail of the key, push up the marked switch, and the hidden mechanical key will pop out slightly, then you can remove the mechanical key. 2. Still at the tail of the key, use the mechanical key you just took out to press against the marked position, and with a slight force, the key shell can be opened. 3. Replace with a new battery (note that the positive and negative poles of the battery should not be reversed). 4. Then proceed with the installation steps, insert the top of the shell first, and then press firmly on the other end. Below is an extended introduction to the reasons why the key may not work: 1. Falling from a height can easily damage the car key. The internal circuitry of the key is actually quite weak against impact and can be easily damaged in the event of a severe collision. 2. Another situation is water ingress into the key. If water seeps inside and burns out the circuitry, it can also cause the remote to malfunction.
Last time my Mercedes key remote stopped working, it was just a dead battery issue. Replacing it myself was very simple and hassle-free. When opening the key case, don't pry directly with metal tools as it can scratch the surface - I recommend using a plastic card or your fingernail to gently push open from the gap. Inside there's a small button battery, usually CR2032 model - remember to check the positive/negative sides to avoid installing it backwards. Take out the old battery, put in the new one, then firmly press the case closed. Test all buttons to confirm functionality is restored. The whole process takes less than 5 minutes and saves dozens in service fees. Battery life is typically 1-2 years, and frequent driving drains it faster - I check mine every other year to avoid surprises.
