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2009-2012 Toyota Corolla Key Fob Battery Replacement Guide
How to replace the coin cell battery in the key fob remote control of a 10th generation (2009 to 2012) Toyota Corolla.

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2010 Corolla Key Fob
Notch At Top Of Fob
Pry Off Back Cover
This automotive maintenance "how-to" guide was specifically written to assist owners of the 10th generation (2009, 2010, 2011, 2012 & 2013) Toyota Corolla in replacing the battery in the combination car key and keyless entry remote control.

Owners of other Toyota, Lexus, Scion or related Pontiac models with similar key fobs such as the Camry, RAV4, Yaris, Avalon, 4Runner, Venza, xB, xD, tC and Vibe may also find these DIY instructions to be helpful.

A replacement coin (A.K.A. button or watch) battery for the 09-12 Toyota Corolla key fob is part number CR2025 from manufacturers such as Sony, Panasonic, Energizer, Duracell, and Maxell.

The only tool needed to access the key fob battery is a small flathead screwdriver.

Back Cover Removed
Remove Remote Control Unit
"Screwdriver To Open"
Locate the small notch at the top of the key fob and use the blade of the flathead screwdriver to gently pry off the back cover.

Then pop out the small remote control unit from the key fob case.

Pry Apart Remote Unit
Black Case & Remote Unit
Lift Off Plastic Cover
Look for the words "Screwdriver To Open" on the remote control unit's black plastic outer case.

Gently pry out the translucent plastic remote control from the black plastic case using the blade of the flathead screwdriver.

Turn Over Remote Control
Push Out Old Battery
Sony CR2025 3V Battery
Turn over the remote control unit and carefully push out the old CR 2025 battery.

Slide in a new CR2025 3V lithium battery with the positive (+) side facing up towards you.


Slide In "+" Side Up
Insert Remote Into Case
Snap On Plastic Cover
Insert the remote control unit back into the black plastic outer case.

Snap the translucent plastic cover over the remote control.

Test Battery - Red Light
Re-Insert Remote Unit
Back Cover & Key
Before you fully re-assemble the key fob, test out the new battery by pressing the buttons.

If you see a small red led light illuminating, the new battery is working properly.

Insert the remote control unit into the front half of the key fob case.

Replace Key Fob Cover
Snap Back Cover In Place
Press Unlock - Test Fob

Line up the back cover of the key fob over the front piece and gently snap them together. Make sure that the two halves of the fob are flush all the way around.

Test the new battery again by standing next to your Corolla and pressing the "Lock" or "Unlock" buttons. If the new battery is working properly, you'll see the parking lights flash and hear the car making "beep" sounds.

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

For more check out my other guides below -

2009-2013 Toyota Corolla Repair & Maintenance Guides

2003-2008 Toyota Corolla Repair & Maintenance Guides

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