Introduction
If the key fob to your 2020 Toyota Sienna has not been working correctly—not locking/unlocking, weak connection to the vehicle, or needing to use a physical key to operate your vehicle—this guide will show you how to replace the battery.
Before starting this task, make sure you have a prying tool and a CR2032 3V battery in hand. Be very cautious when separating your key fob.
Step 4 requires you to simply take out the battery and replace it with the new one then carefully close the fob back to one piece.
It's as simple as that!
Tools
Parts
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Position the battery on its side where the "Push" button is.
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Click down on the "Push" button.
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Pull out the physical key at the top of the fob on the same side as the "Push" button is located.
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Place the tip of a spudger in the slotted area and twist to pry the fob open.
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Separate the two sides of the fob carefully.
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Lay out the two sides of the fob with the interior of the fob facing you.
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Remove the battery from the key fob.
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Carefully insert the new battery in the battery placeholder.
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Grab the other side of the key fob and make sure they're aligned with each other before snapping them back together.
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Carefully close them together.
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Grab the physical key and insert it back into its place.
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Now the battery has been replaced and you are good to go!
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