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Toyota Prius Smart Key Fob Battery Replacement Guide
How to replace the coin cell battery in the smart key fob remote control of a 3rd generation 2010-2013 Toyota Prius.

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Toyota Prius Smart Key Fob
Metal Key Release Button
Pull Out Metal Ignition Key

This automotive "how-to" guide was specifically written to assist owners of the third generation (2010, 2011, 2012 & 2013) Toyota Prius hybrid hatchback in replacing the coin cell battery in the smart key fob.

Owners of the previous 2nd generation 2004-2009 Prius and other Toyota, Lexus or Scion vehicles such as the Yaris, Corolla, Matrix, Camry, Sienna, Avalon, Highlander, RAV4, FJ Cruiser, Venza, 4Runner, Sequoia, Tacoma, Tundra, ES350, IS250, IS350, LS460, GS300, GS350, SC430, RX450h, tC, FR-S, iQ, xD, and xB may also find these DIY instructions to be helpful.

A replacement smart key fob battery is part # CR1632 from manufacturers such as Panasonic, Duracell, and Engergizer.

The only tool needed to access the battery is a small flathead screwdriver. You could also use a coin, butter knife or nail file.

Locate Notch At Bottom
Pry Apart Two Halves
Open Smart Key Fob
The first step is to remove the metal ignition key that is stored inside of the smart key fob.

Push in the rubber button located on the left side of the key fob and pull out the metal ignition key from the key ring loop.

Insert the blade of the small flathead screwdriver into the notch at the bottom of the key fob where the ignition key used to be and gently pry apart the two halves.

Two Halves Separated
Remove Remote Control
Circuit Board Removed
Set aside the top half of the key fob that contains the rubber buttons.

Lift the green plastic remote control unit circuit board out of the bottom half of the fob.

Turn over the remote control unit to access the old key fob battery.

Pry Out Old Battery
Panasonic CR1632 3V
Insert New CR 1632 Battery


Gently pry out the old battery with the flathead screwdriver or your fingernail.

Try to avoid damaging the metal electrical contact points.

Insert a new CR1632 3V coin cell battery into the remote control unit with the "+" positive side facing up.

Fob Battery Replaced
Re-Insert Remote Control
Bottom Half - Top Half
Insert the remote control unit into the bottom cover of the key fob with the battery facing down.
Lower Top Half
Line Up Two Halves
Snap Together Key Fob
Line up the top half of the key fob over the bottom half and gently snap them together.

Make sure that the two halves of the key fob are flush together all the way around.

Re-Insert Ignition Key
Key Fob Re-Assembled
Test New Key Fob Battery
Re-insert the blade of the metal ignition key back into the key fob until it snaps into place.

Test the new smart key fob battery by standing next to your Prius and pressing the unlock or lock buttons. If the new battery is working properly, you will see the parking lights flash.

For more, check out my other Toyota Prius DIY Repair & Maintenance Guides.

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