How to Change the Battery in Toyota Cars

by Contributing Writer; Updated June 12, 2017

A Toyota car can be opened with a regular door Toyota car or a smart Toyota car. The Toyota car or smart Toyota car operates and unlocks the vehicle through a Toyota car entry option. The Toyota car contains a small circuit board inside, as well as a battery. In order for the Toyota car to function properly, you have to replace the battery occasionally. Your Toyota car dealer can change the battery for you, but the process is a straightforward one that you should be able to do yourself. In addition to the dealer, Radio Shack carries Toyota car batteries, according to the Lean Crew website.

Under The Hood:

 How to Change the Battery in a Toyota Camry Key Fob

Hold the Toyota Camry key fob firmly. The Lean Crew website explains that the fob can be opened with a flat-head screwdriver or the tip of the car's regular key. Insert the screwdriver or key into the seam of the fob and carefully twist the instrument until the two halves of the fob separate.

Use the screwdriver or key to gently pry the circuit board out of the fob casing. The circuit board is held in place with adhesive tape so that it will not fall out unexpectedly. Once the circuit board is removed, turn it over to gain access to the battery.

Remove each of the three supports that are holding the battery in place. Take the battery out of the fob.

Position the new battery in the key fob according to the illustration on the inside of the fob. The battery must be installed correctly in order for it to work. Position the three supports to secure the new battery.

Turn the circuit board over and reinsert it securely into the key fob. Align the two halves of the key fob and apply pressure until they snap together. Once the key fob is securely fastened, test it to make sure that the new battery is working.

Items you will need

  • key fob

  • vehicle key or flat-head screwdriver

 How to Change the Battery in a Smart Key

Call a local Toyota dealership to find out what type of battery you need to get for the Smart Key. You will then need to locate the battery at a supply store or home improvement shop. By purchasing the battery before you attempt to replace it, you'll eliminate the guesswork.

Pull out the mechanical key that is at the bottom edge of the Smart Key. Use only this key as your tool to probe the Smart Key. You will not need a knife, pencil or other sharp object to get to the battery.

Pry open the smart key by locating a thin slot in which the mechanical key fits into comfortably. You should not have to force the key into any part of the outer casing.

Turn the key as if it is a lock and you should see the outer casing open in half. Pull it apart carefully.

Look for the round battery on the small circuit board inside the Smart Key. If the battery is not on the side of the circuit board that faces you, use the mechanical key to lift the circuit board from the casing and you will find the battery on the other side.

Remove the old battery and insert the new one in its proper place. Then put the two sides of the casing back together and insert the mechanical key into its proper slot.

Test the key right away to make sure you have successfully completed the installation.

Items you will need

  • Smart Key

  • Replacement battery

 How to Replace the Battery in a RAV4

Set the parking brake and put the transmission in "Park." Turn off the engine and remove the ignition key. Install the memory-saver according to the manufacturer's instructions. Wait at least six minutes after the key is turned off before disconnecting the battery.

Remove the nine clips on the radiator support cover and remove the cover. Disconnect the negative battery cable, and then disconnect the positive cable. Disconnect the two wire harness clamps. Remove the nut and bolt from the battery clamp, and remove the clamp. Remove the battery.

Install the battery and the battery clamp. Install the clamp nut and bolt -- tighten the nut to 43 inch-pounds and the bolt to 12 foot-pounds. Connect the two wire harness clamps. Connect the positive battery cable, then the negative cable. Tighten the cable nuts to 35 inch-pounds

Install the radiator support cover and install the cover clips. Remove the memory-saver.

Items you will need

  • Memory-saver device

  • Wrench set

  • Socket set

  • Ratchet

  • Torque wrench

 How to Replace the Battery for a Toyota Smart Key

Remove the standard key that is stored inside the Smart Key. To release it, press the latch on the side of the fob. You can now slide the standard key out of the fob.

Insert the end of the key into the small slot at the end of the Smart Key. Give the key a twist and the Smart Key fob will pop open.

Gently insert the end of the standard key under the edge of the circuit board that you exposed when you opened the fob. Lift up on the key to remove the circuit board. The battery is underneath.

Loosen each of the three clips holding the battery in place and remove the battery. Replace the battery with a fresh one. You can find the correct battery size at Radio Shack or at a pharmacy that carries hearing aid batteries.

Replace the circuit board and snap the top of the fob back into place.

 How to Replace the Battery in a Toyota Highlander

Locate the battery easily on the driver's side just behind the headlight.

Remove the cables from the battery terminals with a battery terminal puller. Take off the negative cable first.

Lift the battery out of the compartment. Safely dispose of the used battery at an auto parts store, which will often take it as a trade-in, or bring it to a recycling center.

Use a wire brush to clean the tray that holds the battery. Wipe it off with a damp cloth and let it dry before replacing new battery. Dispose of the rags since they're covered with acid.

Clean the insides of the connector cables with a pointed wire brush. Keep your gloves on at all times to avoid getting acid on your hands and wear glasses or goggles to protect your eyes.

Place the new battery on the battery tray. Attach the correct cable on each terminal and tighten securely with pliers or socket wrench.

Items you will need

  • New 12-volt battery

  • Battery terminal puller

  • Wire brushes

  • Socket wrench

  • Old rags

  • Gloves

  • Goggles

 How to Replace a Battery for a Toyota 4Runner

Pop the hood and use an open-end wrench to disconnect the negative (-) terminal on the battery and place it to the side. Repeat the process for the positive (+) terminal on the battery.

Unbolt the battery tie-down from its tray using the 3/8-inch ratchet and socket. Pick the battery up by the sides and lift it out of the engine bay, then set it out of the way. Lift the replacement battery into the tray and make sure that the positive (+) and negative (-) terminals are in the same orientation as the stock battery.

Bolt the battery to the tray using the battery tie-down strap, and the 3/8-inch ratchet and socket. Connect the positive (+) terminal to the battery using an open-end wrench, then repeat the process for the negative (-) terminal. Start the vehicle and let it run for 10 minutes to make sure the battery is charging correctly.

Items you will need

  • Open-end wrench set

  • Ratchet and socket set, 3/8 inches

  • Replacement battery

About the Author

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