Replacing a Toyota key battery is a simple task that can be completed in a few minutes. A Toyota key battery replacement is necessary when the key fob is no longer able to unlock or lock the doors, or when the keyless entry system is not working. The battery in a Toyota key fob typically lasts for several years, but it will eventually need to be replaced.
There are two types of Toyota key batteries: CR2025 and CR2032. The type of battery that your key fob uses will be printed on the back of the key fob. To replace the battery, you will need a small Phillips head screwdriver. Insert the screwdriver into the small notch on the back of the key fob and gently pry the two halves of the key fob apart. Once the key fob is open, you will see the battery. Use your fingernail or a small pair of tweezers to remove the old battery and insert the new battery. Make sure that the positive side of the battery is facing up. Once the new battery is in place, snap the two halves of the key fob back together.