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Toyota Corolla Key Fob Battery Replacement Guide
How to change the battery in the key fob remote control for a 12th generation 2020 Toyota Corolla sedan.

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2020 Corolla Key Fob
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Back Side of Key Fob
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Release Ignition Key
This automotive maintenance tutorial was specifically written to assist owners of the twelfth generation 2019 (hatchback), 2020, 2021, 2022 (and probably also the 2023, 2024 & 2025) Toyota Corolla sedan in changing the battery in the key fob remote control for the keyless entry system.

Owners of other Toyota and Lexus vehicles such as the Camry, C-HR, Venza, Avalon, 86, Sienna, Tacoma, RAV4, Highlander, 4Runner, Sequoia, IS 350, RX 350, UX 200, GS 350, IS 300 and ES 350 may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also known as a "button" or "watch") battery is part number CR2032.

The tools needed to access and replace the battery include a plastic pry bar tool and a small flat head screwdriver such as from a precision screwdriver set.

An optional first step is to separate your key ring and house key or other keys from the fob.

Press the chrome silver colored button on the top corner of the fob near the "Lock" button to release the "flip out" or "switchblade" style ignition key.



 

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Locate Small Notch
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Insert Pry Bar Tool
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Or Use Screwdriver
Locate the small notch on the bottom corner of the fob just below the chrome silver key ring attachment loop.

Insert the blade of your plastic pry bar tool or a flat head screwdriver into the notch.

Gently twist the tool to pry off the plastic rear battery cover.

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Back Cover Removed
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Lift Red Rubber Cap
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Rubber Cover Removed
Set the back cover aside in a safe place.

Gently pull out the red rubber seal that prevents water, moisture, debris, dust, etc from entering the battery socket.

Set the red rubber cap aside in a safe place.

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Pry Out Old Battery
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Old Battery Removed
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Panasonic CR 2032 3V
Use the small flat head screwdriver to gently pry out the old battery from the socket.

Try to avoid damaging the metal electrical contacts or scratching the green circuit board.

The OEM (original equipment manufacturer) coin cell battery in this 2020 Corolla LE was a Panasonic CR2032 3V.

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Battery Socket
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"+" Positive Side Up
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New Battery Installed
Orientate the new CR2032 battery with the "+" positive side facing up and the "-" negative side facing down into the socket.

Gently insert the new battery into the holder. Make sure it is fully seated in place.

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Replace Rubber Cap
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Line Up Rear Cover
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Snap Together Fob
Lower the red rubber dust cap back into place.

Line up the black plastic rear cover with the back side of the fob.

Gently snap the battery cover back into place.

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Back Cover Secured
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Key Fob Re-Assembled
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Test New Fob Battery
Make sure the two halves of the fob are flush together at every edge.

Swing the ignition key down into the folded (locked) position.

To test the new battery, stand near your car and press the "Unlock" or "Lock" button.

If the new battery was installed correctly and working properly, you should see the parking lights flash and hear the door locks opening or closing.

(You should not have to re-program the key fob. Just changing the battery should not clear the original programming from the factory.)

Be sure to write down the battery change in your vehicle's service records.

Please check out all of my 2020 Toyota Corolla DIY Repair & Maintenance Guides.
 

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