How to change battery in tacoma key fob

Owners of other Toyota, Lexus or Scion vehicles such as the Yaris, Matrix, Prius, Camry, Corolla, Sienna, RAV4, Tundra, FJ Cruiser, Venza, Highlander, Avalon, Sequoia, Hilux, Land Cruiser, IS 250, ES 350, GS 350, tC, xB, xD, iQ and FR-S may also find these DIY instructions to be helpful.

A replacement coin cell (A.K.A. "button" or "watch") battery is part number CR2032 which is available from various manufacturers such as Panasonic, Sony, GE, Duracell, Maxell and Energizer.

The only tool needed to access and replace the battery is a small flathead screwdriver.

You may also be able to use a coin, butter knife or a nail file.

The first step is to separate the ignition key and metal key ring from the fob remote control unit.

Locate the small notch on the bottom right corner of the fob near the red "Panic" button.

Insert the screwdriver, butter knife, Quarter or nail file in to the notch and gently pry apart the two halves of the fob.

Pull the rubber buttons piece and the remote control unit out of the fob's rear cover.

Carefully push the old CR2032 battery out of the screwdriver or slide it out with your finger.

Try to avoid scratching or damaging the green circuit board.

Slide a new # CR2032 3 volt coin cell battery in to the socket with the "+" positive side facing up towards you and the "-" negative side facing down.

Replace the remote control unit in to the top half of the fob with the "Unlock", "Lock" and "Panic" buttons orientated in the correct position.

Line up the two halves of the key fob.

Gently push together the two halves of the key fob until they snap back in to place.

Make sure that the front and back cover of the key fob are flush together with no part of the rubber buttons piece visible at the edges.

To test the new key fob battery, stand near your Tacoma and press the "Unlock" or "Lock" buttons.

If the new battery is working properly, you should see the parking lights flash and hear the door locks opening or closing.

Owners of other Toyota or Lexus vehicles such as the Tundra, 4Runner, Hilux, Highlander, C-HR, Avalon, Camry, Corolla, Supra, Land Cruiser, Prius, RAV4, Mirai, Sequoia, Sienna, Yaris, CT 200h, ES 300h, RX 350, GX 460, LX 570, NX 300, RX 450h, UX 200 and UX 250h may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also known as a "button" or "watch") battery part number is CR2032 which is available from various manufacturers such as Panasonic, Energizer, Sony, Duracell and Maxell.

The only tool needed to access and replace the battery is a small flat head screwdriver or a small plastic pry bar tool.

The first step is to locate the button on the left side of the smart fob with the word "PUSH" written on it.

Push in the release button on the side of the fob and slide the emergency / backup metal ignition key out of its slot.

Set the ignition key aside in a safe place.

Insert the flat head screwdriver into the notch where the metal ignition key used to reside.

Gently twist the screwdriver to pry apart the two halves of the plastic fob housing.

Set the front cover of the fob with the rubber buttons aside.

Carefully remove the green circuit board out of the rear cover of the fob.

Turn over the remote control unit to access the battery holder.

Use a small flat head screwdriver to gently pry out the old battery at the bottom of the remote control unit where there are two flexible metal retaining clips.

Do NOT pry out the battery at the center of the remote control unit to avoid breaking the two plastic retaining tabs.

Avoid using excessive force. The old battery should pop out relatively easily.

The OEM (original equipment manufacturer) battery in this fob for this 2020 Tacoma TRD Sport was a Panasonic CR2032 3 volt coin cell.

You'll notice that the battery holder is marked with the part number CR2032 "3V" and "+ UP".

Orientate the new CR2032 battery with the positive "+" side facing up towards you and the "-" negative side facing down into the socket.

First, insert the battery into the top of the socket near the middle of the remote control unit.

Then gently pop the battery into the bottom of the socket.

Make sure the new battery is securely seated in the holder.

The two metal retaining clips should be gripping over the top of the new battery.

Lower the remote control unit with the battery socket facing down into the back cover of the fob.

Line up the front cover of the fob with the rubber buttons insert over the remote control unit.

Gently snap together the fob.

Make sure the front and rear halves are flush together at every edge.

Replace the backup / emergency metal ignition by sliding it into the slot.

The key should "click" securely into place.

To test the new battery, stand near your truck and press the "Unlock" and "Lock" buttons.

If the new battery is working properly, you should see the parking lights flash and hear the door locks opening and closing.

(You should not have to reprogram the key fob. Just changing the battery does not clear the original programming from the factory.)