A key fob allows a driver to operate some basic functions of a vehicle remotely. It most commonly has lock/unlock on it, but may also include a trunk/tailgate release, panic, engine start, or other features.
Replacing the Battery by Cars Simplified
Some key fobs are easily opened with a flat blade screwdriver, while others are more difficult to open. This common Ford/Lincoln/Mercury key fob can be opened with a small flat head screwdriver. The chip comes out of the button rubber piece and the battery can easily be accessed. This video was posted on November 7th, 2018. It was hosted by Steve, and the background music is by Sawtooth.
Testing a Key Fob by Cars Simplified
In this video, Steve shows some basic ways to test a key fob that isn't functioning properly using a multimeter to test electronic parts on the circuit board. This video was posted on November 3, 2018. Where to buy items used in the video: