How to Replace the Battery in a Toyota Prius Key Fob

Here's how to replace the battery on a 2004-2009 Prius remote entry key fob. You'll know your battery has died when the car won't start without the key in the ignition and keyless entry stops working.

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Slide the switch on the fob to remove the key.

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Once the key has been removed flip over the fob.

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With your thumb on the Toyota logo gently press the same switch that you used to remove the key while sliding the back plate up.

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Remove the four screws to get access to the battery.

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Remove the old battery.

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Replace the battery with a fresh CR2032 battery.

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Screw all the screws back in.

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Put everything back together by lining up the hinges on the fob and the backplate.

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Gently slide the backplate all the way down while pressing in the same switch that you used to remove the key.

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Everything should be perfectly lined up!

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Slide the key back in and your fob should have all the original functionality.

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