1. Gather the necessary tools:
- A flat-head screwdriver or a key fob opening tool.
- A new CR2016 (or CR2025) coin cell battery.
2. Locate the key fob release button:
- This button is usually a small, round button on the side or back of the key fob.
- Press and hold the button to release the mechanical key from the key fob.
3. Remove the key fob cover:
- Carefully use the flat-head screwdriver or key fob opening tool to pry open the key fob cover, starting from a corner or seam of the fob.
- Be careful not to damage the cover.
4. Locate the battery:
- Inside the key fob, you'll find the CR2016 (or CR2025) battery.
- It is usually held in place by a small clip or bracket.
5. Replace the old battery:
- Carefully remove the old battery from its holder.
- Be sure to note the orientation of the battery and replace it accordingly (usually with the positive (+) side facing up).
- Make sure the battery is properly seated in its compartment.
6. Reattach the key fob cover:
- Align the edges of the key fob cover with the corresponding grooves in the key fob.
- Gently press the cover until it snaps back into place and is securely closed.
7. Test the key fob:
- Press the buttons on the key fob to ensure they are functioning correctly.
- You can lock and unlock your vehicle, use the trunk release, or start the engine (if it is a smart key).
8. Dispose of the old battery:
- Make sure to dispose of the old battery properly according to your local recycling guidelines.
Here are a few additional tips:
- If the battery is difficult to remove, you can use a small pair of tweezers to help you pry it out.
- Avoid touching the battery terminals with your fingers, as this can reduce the battery's life.
- Make sure the new battery is inserted correctly, as incorrect orientation can cause damage to the key fob.
- If you are still experiencing issues or the key fob buttons are not working properly after replacing the battery, it may be time to have it inspected or repaired by a professional automotive technician or a Lexus dealer.
