How to Replace the Battery in a 2020 Lexus ES 300h Key Fob
If your ES 300h remote key fob isn't working well, the cell battery more likely needs to be changed. In this article, we demonstrate how to open Lexus keyless entry remote and replace a weak battery yourself. If you choose to do it at home near ES 300h, follow our instruction, but first make sure you have all you need.
What type battery keyless entry remote useChanging battery in remote key fob require flat head screwdriver and CR2032 battery. Prepare these materials and tools before opening and make sure to match the size of your fob’s batteries.
- 1xCR2032 battery
- flat head screwdriver
Step by step instruction
Inside of your key fob installed small button battery. Remove any internal key first, and then try to pry apart the remote key fob.
Gently try to open your fob with flat head screwdriver. Replace 1 CR2032 battery with flat head screwdriver.
Now it's time to install new battery inside fob’s case. Every battery has a negative and positive side and if you put the wrong connector down, the current cannot go into your circuit board and make it work. Check polarity on battery, by "+" mark.
Before assembling keyless entry fob's case, verify that all functions works by pressing buttons on circuit board.
At this point squeeze fob’s back cover together. Line your shell two halves together and assemble it together by hands from top to bottom. If your fob case tightly closed, we done. If not, repeat the last step.
How to replace the battery video guide
How-To Replace Smart Access Key Battery | Lexus