How To Change Battery In Mercedes Key Fob 2014. Lift the battery compartment out to replace the batteries. I bought it at a local cvs where batteries don't sit for long, so.
Pull the tab at the bottom, and push the key into the narrow end of the slot to pop off the cover and replace the batteries. Remove the battery from the back cover. There are several mercedes smart key remotes so make sure to look at the correct video.
Check that you are using the proper key to start your car.
If there is not reset procedure, i would recommend contacting your local mercedes benz dealer as they will likely have any tools required to reset the light. It is also possible that the key fob itself has a malfunction that is causing the light to come on. Typically it doesn't take more than a few minutes. Slide the lever on your key fob to the left, and remove the valet key.