Toyota’s owner’s manuals call for a CR2032, CR2016 or CR2450 in the key, depending on the model, the year and whether the car has the smart key system.
The battery it takes
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Toyota key batteries by model
| Model and key | Battery |
|---|---|
| 2024 Camry | CR2032 |
| 2017 Camry, smart key (has a mechanical key inside) | CR2032 |
| 2017 Camry, no smart key (a key you turn to start) | CR2016 |
| 2015 Camry, smart key (has a mechanical key inside) | CR2032 |
| 2015 Camry, no smart key (a key you turn to start) | CR2016 |
| 2025 Corolla, smart key (has a mechanical key inside) | CR2450 |
| 2025 Corolla, no smart key (a key you turn to start) | CR2032 |
| 2024 Corolla, smart key (has a mechanical key inside) | CR2450 |
| 2024 Corolla, no smart key (a key you turn to start) | CR2032 |
| 2019 Corolla, smart key (has a mechanical key inside) | CR2032 |
| 2019 Corolla, no smart key (a key you turn to start) | CR2016 |
| 2014 Corolla, smart key (has a mechanical key inside) | CR2032 |
| 2014 Corolla, no smart key (a key you turn to start) | CR2016 |
| 2025 RAV4 | CR2032 |
| 2024 RAV4, built in Japan (built through June 2024) | CR2032 |
| 2018 RAV4, smart key (has a mechanical key inside) | CR2032 |
| 2018 RAV4, no smart key (a key you turn to start) | CR2016 |
| 2024 Highlander | CR2032 |
| 2016 Highlander, smart key (has a mechanical key inside) | CR2032 |
| 2016 Highlander, no smart key (a key you turn to start) | CR2016 |
| 2023 Tacoma, smart key (has a mechanical key inside) | CR2032 |
| 2023 Tacoma, no smart key (a key you turn to start) | CR2016 |
| 2015 Tacoma, wireless remote | CR2032 |
| 2024 Tundra | CR2450 |
| 2023 4Runner | CR2032 |
| 2023 Prius | CR2450 |
A model listed once has one battery for every key in its manual.
How to change it, in Toyota’s steps
- Smart key only: slide the release and take out the mechanical key.
- Pry off the key cover with a flathead screwdriver. Cover its tip with a rag (the 2024 Tundra manual says tape) so it doesn’t damage the key. On a key without the smart key system, then remove the battery cover.
- If the electronic key module sticks to the cover and hides the battery, lift the module out to reach it.
- Take the old battery out with a small flathead screwdriver and put the new one in with the + terminal facing up.
- Refit the cover. On a key without the smart key system, the battery cover goes back with its tab facing up.
- Press lock or unlock and check that the doors respond.
Toyota’s notices say to work with dry hands, as moisture may rust the battery, and not to touch or move any other part inside or bend the battery terminals.
If the key battery dies
A depleted battery stops the smart key system and wireless remote working properly, or shortens their range, Toyota says. Carry the mechanical key with the electronic key: it opens the driver’s door.
To start the engine, put the shift lever in P, press the brake firmly and touch the Toyota emblem side of the electronic key to the engine switch. When a buzzer sounds and the switch turns to IGNITION ON, press it shortly and firmly. Toyota calls this a temporary measure and recommends replacing the battery right away.
In the 2023 Prius, touch the area behind the buttons on the electronic key to the power switch. It turns to ON.
Keep coin batteries away from children
Toyota warns that a swallowed battery may cause severe chemical burns in as little as 2 hours, and death or serious injury. If the key’s cover won’t close firmly, stop using the key, store it where children can’t reach it and contact a Toyota dealer.
The National Capital Poison Center says that if anyone swallows a battery, immediately call the 24-hour National Battery Ingestion Hotline at 1-800-498-8666 or your poison center at 1-800-222-1222. Don’t delay. Immediate treatment decreases severity.