Check Your Keyless Entry Remote Battery
Jan. 26, 2019
Most Car Remote Key use category 4 button cell batteries that aren’t expensive. However, it’s still a good idea to verify the actual battery your remote uses and check to see whether or not it’s good.
There are a few ways to determine the type of battery you need. It may say in your manual, or you can contact a local dealer. You can also just open up the remote and look at the battery, which will typically have a number printed or stamped into its surface. Car key remotes typically use CR2025 or CR2032 batteries, although CR1620, CR1632, and others are also used in some applications.
Once you know what type of battery is in your 3 Button Remote Smart Key, you can either check the voltage with a multimeter, or just swap out a known good battery since they aren’t that expensive. Most of these batteries should show about 3 to 3.6 volts.
If your car key remote works after replacing the battery, then you’re done. If it doesn’t, then there could be another problem with the remote, like broken battery contacts or a problem with the buttons. It's also possible that your vehicle may have forgotten your fob, in which case you will need to reprogram it.