How to Replace Battery Key for Lexus GS300

Written by dwight valdez
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How to Replace Battery Key for Lexus GS300
Lexus Key Fob (IkeV,

Replacing a key battery is as simple as driving to your Lexus dealership and having them replace it. However, if you want or need to do it yourself, check your owner's manual to get the correct battery size before you head out to the auto-parts store. Then you can get down to the business of opening up your key and replacing the battery.

Skill level:

Things you need

  • Size-zero "0" Phillips Jewelers Screwdriver
  • Lithium CR1616 battery

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  1. 1

    Locate the screw. It is on the side opposite the control buttons.

    How to Replace Battery Key for Lexus GS300
  2. 2

    Remove the screw with the screwdriver. Carefully store the screw in a safe place.

  3. 3

    Open the cover by pushing it away from the key. You may need to exert pressure to slide it off.

    How to Replace Battery Key for Lexus GS300
  4. 4

    Remove the battery/button control module by lifting it from the key frame.

    How to Replace Battery Key for Lexus GS300
  5. 5

    Remove the two screws from the module and take off the lid. Carefully store the two screws in a safe place.

  6. 6

    You will see a rubber O-ring and the battery in the centre. Take out the used battery and replace with a new one. The positive side should be up.

  7. 7

    Reposition the O-ring if it was dislodged while replacing the battery.

  8. 8

    Place the lid on the module and install the two screws.

    How to Replace Battery Key for Lexus GS300
  9. 9

    Place the module in the original position of the key frame and secure the key cover by installing the screw. All done.

Tips and warnings

  • Wash and dry your hands first. This will prevent dirt and oils from adhering to the metal components and the inside of the module.
  • Do not touch the components and battery electrode within the module.
  • Be careful not to bend the O-ring.

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