Hi! I bought a spare used key for my 2017 E-Class, and before I go to a local shop to pair it with my car, I was wondering if the LED on top of it should light up whenever I press a button on the key. I changed the battery too and it doesn't light up. Is the key defective or it won't light up unless the car is paired and in range?
It's the model in the photo.
It's the model in the photo.