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Toyota Key Fob Battery Replacement Guide

Toyota Key Fob not working? Instructions on how to replace the battery in a Toyota Key Fob

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Is your Toyota Key Fob not working? Your battery may have died and you need to replace the battery in your key fob. This how to guide was written to help those whose Toyota car and truck keyless entry remote stopped working and may need to change the battery in their door lock clicker remote control. When the battery in your keyless entry system dies you will not be able to unlock or lock your doors, pop open your trunk or use the vehicles panic button.

This how to replace the battery in your Toyota Key Fob guide was specifically written for owners of the 2003-2009 Toyota 4Runner. But owners of the 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 model Toyota vehicles including the Camry, Corolla, Avalon, Solara, Celica, Cressida, Matrix, MR2, Supra, Tercel, Paseo, Prius, Sera, Starlet, Venza, Yaris, Echo, FJ Cruiser, Highlander, Hilux, Land Cruiser, Previa, RAV4, Sequoia, Sienna, Tacoma, T-100, Tundra, Lexus IS, GS, SC, CT 200h, HS 250h, ES, LS, RX, GX, LX. Read disclaimer.

Tools Needed: Small Flathead Screwdriver, CR2032 Battery

Note: If your Toyota key fob is still not working after replacing the battery you may need to program it to the vehicle again. Sometimes when you change your car battery or other computer or electrical control modules on your vehicle you may clear the remote from the vehicle's memory. To program a new key fob to your Toyota or re-program an old remote to your car you can try using the Toyota Key Fob Programming Guide for instructions on how to program a key fob to a Toyota car or truck. It also has instructions on how to clear all remotes from the vehicle.
Toyota Key Fob Buttons
Toyota Key Fob Alarm Button
Toyota Keyless Entry Remote
In order to open the Toyota key fob you will first need to remove the fob from the key ring it is attached to. This particular key fob was from a 2003 Toyota 4Runner and has an unlock button, lock button, and a button to lower the rear window of the lift gate or trunk door.
Key Fob Opening
Insert Screw Driver into Fob
Open Toyota Key Fob
There is a small notch on the bottom of the Toyota Key fob that you can insert a coin or flathead screw driver into and gently twist until the top and bottom of the key fob open.
Key Fob Circuit
Toyota Key Fob Battery
Remove Key Fob Battery
Once you have separated the keyless entry remote be careful that the buttons do not fall out as there is nothing hold the insides of the fob together.

At this point you can see the CR2016 or CR2032 coin battery that needs to be replaced. Depending on your year and model you may have the newer CR2032 style battery. What is the difference between the two batteries? The replacement CR2032 is twice as thick as the CR2016 and it holds a charge longer, both batteries have the same diameter.

You may use a small flathead screwdriver to gently pry out the dead key fob battery.

Toyota CR2016 Key Fob Battery
Replace Keyless Entry Battery
New Key Fob Battery Installed
Once you have removed the battery from the key fob you can replace it with the new battery.
Close Key Fob
New Battery in Key Fob
Test Key Fob New Battery
To close the key fob leave the half with the buttons and battery facing down and place the backside of the key fob over it and line up the two halves. If you pick up both pieces and try to put them together you may drop insides of the key fob out.

Snap the two pieces of the key fob together and test the buttons to make sure they are working.

If the Toyota key fob is still not working after you replaced the battery you may need to reprogram it to the vehicle or if you purchased a new Toyota key fob it will also need to be programmed to your Toyota. Please see the page for Instructions on How To Reprogram a Toyota Key Fob. Also see Toyota Camry Repair and Maintenance Guides and Toyota 4Runner Maintenance and Repair Guides for additional how to guides. If you are not comfortable reprogramming your key fob you will need to take it to the dealership for reprogramming. For BMW owners see How to Replace the Battery in a BMW Key Fob for instructions on changing a dead battery.

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