How do you change a battery in 2009 Lexus es350 key fob?

To change the battery in a 2009 Lexus ES350 key fob, first, use a small flathead screwdriver to gently pry open the key fob. Once opened, remove the old battery, typically a CR1632 type, and replace it with a new one, ensuring the positive side is facing up. Finally, snap the fob back together and test it to ensure it’s working properly.