The backup works only while the owner is holding that same fob. The cell usually fitted is a CR2032 in most push-button smart keys, and the key is a smart key the owner is still holding. People who searched start toyota with a dead key fob still have one rule to follow. The stamp on the old cell wins.
Read the stamp before a dead smart key
The coin already in the shell is the buying guide for a dead smart key.
CR1632 is reported for a dead smart key on some mid-generation smart keys, including certain Prius shells.
The CR2016 you might buy for a dead smart key is 20 mm across and 1.6 mm thick.
Every one of those coins, in the case of a dead smart key, is a 3-volt lithium cell.
A rechargeable LIR2032 does not belong in the shell for a dead smart key.
A mark molded into the plastic wins over habit during a dead smart key.
Right-hand drive does not change the coin you buy for a dead smart key.
Touching a dead smart key to the start button is a separate backup, not the shopping step in a dead smart key.
Close the cover fully before you test a dead smart key from outside the car.
A brochure can list two keys for one car, and a dead smart key still follows the shell you are holding.
If the shell in a dead smart key is a new undocumented shape, the pry method is not confirmed.
Put the car in Park, put your foot on the brake, touch that fob to the start button, then press the button.
A flip key or a remote-head has a metal blade for the door. It does not use this touch method.
Match the cell for a dead smart key
A push-button smart key from the 2010s onward usually takes a CR2032 when you are doing a dead smart key.
If two reliable notes disagree about a dead smart key, the page says they disagree.
The CR2025 you might buy for a dead smart key is 20 mm across and 2.5 mm thick.
Same voltage does not make the coins interchangeable for a dead smart key.
Almost every Toyota fob takes one cell, and a dead smart key is not a two-cell case.
A battery-only swap for a dead smart key does not require programming.
Base grades often kept a metal key after a higher grade moved on, which still matters for a dead smart key.
Keep the spare coin for a dead smart key in a cool drawer, not on a dashboard.
A gap at the cover, during a dead smart key, means the coin is too thick or a clip missed.
Japan, Australia, Europe, and the US can print different grade names around a dead smart key.
A bZ4X-style shell is not opened with an older Camry method during a dead smart key.
The touch uses the fob the owner already has. It does not replace a missing fob.
If the dash stays dark, the 12-volt battery is the suspect, not the coin.
Keep the wrong parts out of a dead smart key
An older remote-head key or flip key usually takes a CR2016 when you are doing a dead smart key.
CR1616 is uncommon for a dead smart key and is not the default older Toyota cell.
A CR1632 reported for a dead smart key is 16 mm across and 3.2 mm thick.
A CR2450 is the wrong coin for a dead smart key.
This site does not invent a two-battery fob for a dead smart key.
After a dead smart key, lock the car once from outside and then unlock it once.
Grade names used for a dead smart key belong to that market, not to a borrowed US list.
A pharmacy coin and a dealer coin are the same job for a dead smart key when the stamp matches.
Do not stack a second coin as a shortcut for a dead smart key.
The work of a dead smart key stays a cell swap on a hybrid.
If the stamped coin is seated and a dead smart key still fails, the fob has failed. Stop.
A dead coin is the usual reason the car cannot hear the fob across the cabin.
Close the shell after a dead smart key
CR2025 appears for a dead smart key only on some older compact remotes.
The CR2032 you might buy for a dead smart key is 20 mm across and 3.2 mm thick.
A CR1616, uncommon for a dead smart key, is 16 mm across and 1.6 mm thick.
An A23 battery is the wrong shape for a dead smart key.
Plus, while you handle a dead smart key, is the flat branded face unless the shell mark disagrees.
A hybrid badge does not change the coin you buy for a dead smart key.
A never-paired extra fob is outside a dead smart key. A dealer or licensed locksmith does that work.
A date code on the blister for a dead smart key tells you the coin is fresh. It does not choose the size.
Do not slip foil under the coin as a shortcut for a dead smart key.
The work of a dead smart key stays a cell swap on a right-hand-drive car.
Write the stamp on the spare sleeve when you finish a dead smart key.
After you arrive, replace the stamped cell so the next start does not need the touch.
Pages that sit beside a dead smart key
Continue with the write-up on What Battery Does a Toyota Key Fob Take.
Continue with notes for How to Replace a Toyota.
Continue with Toyota Key Fob CR2032.
Continue with the page Toyota Key Fob Low Battery Warning.
Continue with the write-up on Toyota Key Fob Not Working After Battery Change.
Questions answered only with the facts above
What is the touch order?
Park, foot on the brake, touch the fob to the start button, then press.
Does this work with a fob you do not have?
No. The owner has to be holding that fob.
Does the touch program the car?
No. It only lets the car see the fob it already knows.
Does the stamp still win for a dead smart key?
Yes. The stamp on the old cell wins over a chart or a photo of another year.