Toyota Hilux Key Battery Replacement: Battery Type and Step-by-Step Guide

A Toyota Hilux key battery replacement is one of the easiest maintenance jobs we can do ourselves. If the key fob has stopped unlocking the doors from its usual distance, requires several button presses, or the smart entry system is becoming unreliable, the small battery inside the key may simply be running low.

Fortunately, replacing it normally takes only a few minutes and requires little more than a small flathead screwdriver and the correct coin-cell battery.

The important part is identifying which battery our particular Toyota Hilux key requires. Battery type can vary depending on the model year and whether the vehicle has a conventional wireless remote or Toyota's Smart Entry & Start system.

For many recent Hilux models, Toyota specifies a CR2032 battery for vehicles equipped with Smart Entry & Start and a CR1620 battery for vehicles without the smart entry system.

In this guide, we'll explain how to identify the right battery, replace it safely, troubleshoot a key that does not work afterward, and answer some of the most common Toyota Hilux key battery questions.

What Battery Does a Toyota Hilux Key Use?

The correct Toyota Hilux key fob battery depends primarily on the type of key.

For several recent Hilux generations, Toyota specifies:

Toyota's 2021 and 2023 Hilux owner's manuals specify a CR1620 lithium battery for vehicles without Smart Entry & Start and a CR2032 lithium battery for vehicles equipped with Smart Entry & Start.

The 2026 Toyota Hilux electronic-key documentation also specifies a CR2032 battery for the electronic smart key.

However, we shouldn't assume that every Hilux key uses the same battery. Some older Toyota Hilux documentation specifies a CR2016 lithium battery.

The safest method is therefore simple: open the key and check the number printed on the existing battery before buying the replacement.

Toyota Hilux CR2032 vs CR1620 Key Battery

CR2032 and CR1620 batteries may look similar, but they are not interchangeable simply because they are both round lithium batteries.

A CR2032 battery is approximately:

• 20 mm in diameter
• 3.2 mm thick
• 3 volts

A CR1620 is approximately:

• 16 mm in diameter
• 2.0 mm thick
• 3 volts

Even though both operate at 3 volts, their physical dimensions differ considerably.

If our Toyota Hilux remote was designed for a CR1620, forcing a CR2032 into the battery compartment can damage the holder or prevent the key casing from closing correctly.

Likewise, installing a smaller battery where a larger one belongs may prevent proper electrical contact.

Always replace the battery with the same type specified for the key. Toyota also recommends using the same or an equivalent battery type specified by the manufacturer.

How Do We Know When the Toyota Hilux Key Battery Is Low?

A Toyota Hilux key battery normally becomes progressively weaker rather than failing instantly.

One of the first things we may notice is reduced range.

Perhaps we previously unlocked the Hilux from across a parking lot, while now we have to stand only a few metres away.

Other symptoms can include:

• Reduced key fob operating range
• Lock button works intermittently
• Unlock button requires several presses
• Smart Entry works inconsistently
• Push-button start has difficulty detecting the key
• Vehicle occasionally displays a low key battery warning
• Remote stops working completely

Toyota specifically notes that a depleted battery can cause the wireless remote or Smart Entry & Start system to stop working correctly and can reduce its operating range.

If both spare and primary keys stop working at the same time, however, the problem may be with the Hilux rather than both batteries.

What We Need for a Toyota Hilux Key Battery Replacement

Replacing the battery usually requires very few tools.

We should prepare:

• Correct replacement lithium battery
• Small flathead screwdriver
• Standard flathead screwdriver if required
• Soft cloth
• Clean, dry workspace

Toyota's Hilux maintenance instructions specifically mention a flathead screwdriver, a small flathead screwdriver, and the appropriate lithium battery.

The cloth is useful because we can wrap it around the screwdriver tip before opening the key.

That reduces the risk of scratching or damaging the plastic housing.

How to Replace a Toyota Hilux Smart Key Battery

If our Hilux has Smart Entry & Start, the key usually contains a hidden mechanical emergency key.

The battery replacement procedure is straightforward.

1. Remove the Mechanical Key

Look for the release button or small latch on the smart key.

Press or slide it while pulling the mechanical key out of the fob.

Keep this key nearby because on some versions it can also help us separate the key housing.

2. Find the Opening Slot

Once the mechanical key has been removed, inspect the edge of the remote.

There should be a small slot designed for separating the two halves of the casing.

Insert the tip of the mechanical key or a small flathead screwdriver into this opening.

3. Carefully Open the Key Fob

Gently twist the screwdriver.

We do not need excessive force.

The two halves should begin to separate.

Work slowly around the edge if necessary rather than forcing one corner.

Using too much pressure could crack the plastic casing or damage the internal clips.

4. Locate the Battery

Once the cover is removed, we should see the round lithium battery inside.

Before removing it, take note of its orientation.

On many recent Hilux smart keys using the CR2032 battery, Toyota instructs us to install the replacement with the positive (+) side facing upward.

5. Remove the Old Battery

Use a small flathead screwdriver to gently lift the battery from its holder.

Try not to touch or bend the electrical contacts around the battery.

We should also avoid disturbing the electronic circuit board unnecessarily.

6. Install the New Battery

Insert the new battery in exactly the same orientation as the old one.

For the relevant Hilux smart-key design, the positive side should face upward.

Make sure the battery sits completely flat inside its holder.

7. Reassemble the Key

Align the two halves of the remote.

Press around the edges until all retaining clips click into position.

Finally, reinstall the mechanical key.

8. Test the Key

Stand near the Hilux and test:

• Lock
• Unlock
• Smart Entry
• Push-button start
• Tailgate or additional buttons if equipped

The remote should work immediately in most cases.

How to Replace a Toyota Hilux Remote Key Battery Without Smart Entry

Toyota Hilux models without Smart Entry & Start may use a different style of remote.

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Recent owner's manuals specify a CR1620 battery for these versions.

The procedure is similar but not identical to the smart key.

Open the Remote Housing

Use a small flathead screwdriver to carefully separate the cover.

Wrap the screwdriver tip with a cloth to prevent scratching the plastic.

Remove the Internal Battery Cover

Some conventional Hilux remotes have another small cover over the battery.

Carefully remove it.

Take Out the Old Battery

Lift the battery from the holder without damaging the terminals or electronic components.

Insert the Replacement

Install the correct battery in the same orientation as the battery we removed.

Toyota's relevant Hilux instructions specify that the positive terminal should face upward.

Close the Remote

Reinstall the battery cover and snap the outer casing together.

Test every button afterward.

Does a Toyota Hilux Key Need Reprogramming After Battery Replacement?

Normally, no.

Simply replacing the battery does not usually erase the key's programming or immobilizer information.

The remote should continue communicating with the Hilux once fresh power is restored.

This is important because the small coin-cell battery powers the remote-control electronics; replacing it does not normally create a new key identity.

If the remote does not work after the battery change, we should first check the battery installation before assuming the key needs reprogramming.

Toyota Hilux Key Not Working After Battery Replacement

Occasionally, we replace the battery and nothing happens.

That doesn't necessarily mean the key has failed.

There are several common causes.

Check Battery Polarity

Open the remote again and check which way the battery is facing.

For many current Hilux electronic keys, the + side faces upward.

An upside-down battery will prevent the remote from operating.

Confirm the Battery Type

Check the number printed on the new battery.

For example, CR2032 and CR2025 batteries have the same diameter but different thicknesses.

Likewise, a CR1620 cannot simply substitute for a CR2032.

Use exactly the type specified for our key.

Try Another New Battery

A newly purchased battery can occasionally be weak, old, or defective.

Testing another high-quality battery is an inexpensive troubleshooting step.

Check the Battery Contacts

Look at the metal terminals around the battery.

They should make firm contact with the battery.

Do not aggressively bend them, but check that they were not accidentally moved while removing the old battery.

Check the Key Housing

Make sure the remote is completely snapped together.

A loose case may allow internal components to shift.

Try the Spare Key

If the spare remote works normally while the primary key does not, the issue is probably inside the primary key.

If neither key works, we may need to investigate the vehicle's electrical or smart-entry system.

Why Is My Toyota Hilux Saying Key Battery Low?

A low-key-battery message normally indicates that the vehicle has detected reduced battery power from the electronic key.

The simplest solution is replacing the battery.

However, we may occasionally see the warning shortly after installing a fresh battery.

If this happens, we should:

1. Confirm the battery is new.
2. Check its orientation.
3. Confirm the correct battery type.
4. Use the vehicle normally for several start cycles.
5. Test with the spare key.

If the warning remains despite installing the correct fresh battery, the key itself or another component of the smart-key system may need inspection.

How Long Does a Toyota Hilux Key Battery Last?

There is no universal replacement interval because battery life depends heavily on usage and environmental conditions.

A key used several times every day may discharge faster than a spare key stored safely at home.

Battery life can also be influenced by:

• Frequency of vehicle use
• Distance between key and vehicle when stored
• Temperature
• Battery quality
• Number of remote button presses
• Smart-key functions

Rather than replacing the battery according to a strict mileage schedule, it usually makes more sense to replace it when operating range decreases or a low-battery warning appears.

Keeping one spare battery at home can also prevent an inconvenient failure.

Can We Start a Toyota Hilux With a Dead Key Battery?

On Hilux models with a smart key and push-button start, a dead key battery does not necessarily mean we are stranded.

The vehicle's emergency starting procedure may allow the Hilux to recognize the electronic key at very close range.

The exact procedure depends on model year and market, so we should follow the owner's manual for our particular Hilux.

The smart key also normally contains a physical emergency key that can be removed from the fob.

This can be useful if the remote door-locking function stops operating because of a dead battery.

Can We Replace the Hilux Key Battery Ourselves?

Yes.

Toyota includes key battery replacement within the do-it-yourself maintenance information for the Hilux, meaning it is generally designed to be a straightforward owner-maintenance job.

However, care is important.

We should avoid:

• Forcing the casing open
• Using an oversized screwdriver
• Touching internal electronics unnecessarily
• Bending battery contacts
• Installing the wrong battery
• Working with wet hands

If the key housing is damaged or difficult to open, having Toyota or an automotive locksmith replace the battery may be preferable.

How Much Does a Toyota Hilux Key Battery Replacement Cost?

A DIY Toyota Hilux key battery replacement is usually inexpensive because the battery itself is a standard lithium coin cell.

The exact price depends on country, retailer, battery brand, and battery size.

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The main cost difference appears when we have someone else perform the replacement.

A Toyota dealer, locksmith, battery store, or automotive shop may charge for labour or service in addition to the battery.

Because the DIY procedure takes only a few minutes, replacing the battery ourselves is usually the cheapest option.

A battery replacement should also not be confused with Toyota Hilux key replacement.

Replacing an entire lost or damaged electronic key can be substantially more expensive because a replacement key may require cutting, coding, and immobilizer programming.

Best Battery for a Toyota Hilux Key Fob

We don't need a Toyota-branded battery.

What matters most is buying the correct battery specification from a reputable manufacturer or retailer.

Common coin-battery manufacturers include:

• Panasonic
• Energizer
• Duracell
• Sony/Murata
• Varta
• Maxell

A fresh branded battery from a reliable seller is generally preferable to an extremely cheap unbranded battery that may have been stored for a long period.

Check the expiry or best-before information on the package where available.

Can We Use a CR2025 Instead of CR2032 in a Toyota Hilux Key?

We wouldn't recommend it unless the owner's documentation specifically allows it.

CR2025 and CR2032 batteries both provide approximately 3 volts and both have a diameter of 20 mm.

The difference is thickness.

A CR2032 is 3.2 mm thick, while the CR2025 is 2.5 mm thick.

That seemingly small difference matters because the key's battery holder is designed to apply the correct pressure to a specific battery.

Using the wrong thickness may create unreliable electrical contact.

If the Hilux key requires a CR2032, use a CR2032.

Can We Use CR2032 Instead of CR1620?

No.

These batteries are physically different.

A CR2032 has a 20 mm diameter, while a CR1620 has a 16 mm diameter.

Although both are 3-volt lithium batteries, the CR2032 is substantially larger.

This is especially relevant to the Toyota Hilux because recent manuals list different battery sizes depending on the key system:

• CR1620 — without Smart Entry & Start
• CR2032 — with Smart Entry & Start

The key type matters.

Toyota Hilux Key Battery Replacement by Model Year

There is no single battery that we can confidently assign to every Hilux ever produced.

Different markets, generations, specifications, and key types exist.

Toyota Hilux 2017 Key Battery

Toyota's 2017 Hilux manual lists:

• CR1620 for vehicles without Smart Entry & Start
• CR2032 for vehicles with Smart Entry & Start

Toyota Hilux 2020 Key Battery

Toyota Hilux 2020 documentation likewise specifies:

• CR1620 without Smart Entry & Start
• CR2032 with Smart Entry & Start

Toyota Hilux 2021 Key Battery

The 2021 manual specifies:

• CR1620 for the conventional wireless remote
• CR2032 for the electronic smart key

Toyota Hilux 2023 Key Battery

The 2023 Hilux owner's manual continues to specify:

• CR1620 without Smart Entry & Start
• CR2032 with Smart Entry & Start

Newer Toyota Hilux Smart Key Battery

Toyota's 2026 Hilux electronic-key documentation specifies a CR2032 lithium battery for the electronic key.

Because Toyota specifications can differ by region and equipment level, always verify the existing battery or owner's manual before ordering one.

Important Safety Precautions

Coin-cell batteries are small, but they aren't harmless.

They should always be kept away from children and pets.

Toyota specifically warns that swallowing a coin or button battery can cause severe internal chemical burns and requires immediate medical attention.

We should therefore:

• Keep new batteries away from children.
• Keep removed batteries away from children.
• Dispose of old batteries properly.
• Never leave loose button batteries on a table or floor.
• Stop using a key if its battery compartment cannot be securely closed.
• Use the correct battery type.

We should also avoid crushing, burning, cutting, or damaging lithium coin batteries.

Toyota Hilux Key Battery Replacement Tips

A few simple precautions can make the process easier.

First, photograph the battery before removing it. That gives us an immediate reference for battery orientation.

Second, work over a table rather than standing outside next to the vehicle. Key components and small batteries are easy to drop.

Third, don't use excessive force when opening the casing.

If it doesn't open easily, check whether we're using the correct slot.

Fourth, check the old battery number before throwing it away.

Finally, test the remote before leaving home.

That way, if something is wrong, we can reopen the key and check the installation immediately.

Frequently Asked Questions

What size battery does a Toyota Hilux key take?

Many recent Toyota Hilux smart keys use a CR2032, while recent Hilux models without Smart Entry & Start may use a CR1620 battery. Some older Hilux keys may use other sizes, including CR2016, so we should check the original battery or owner's manual before purchasing a replacement.

Does the Toyota Hilux smart key use a CR2032 battery?

Many do. Toyota's manuals for recent Hilux models specify a CR2032 lithium battery for vehicles equipped with Smart Entry & Start.

How do I change the battery in my Toyota Hilux key?

Remove the mechanical key if equipped, open the remote using the designated slot and a small flathead screwdriver, remove the old battery, install the correct replacement in the same orientation, close the casing, and test the remote.

Will I have to reprogram my Toyota Hilux key after changing the battery?

Normally, no. A standard battery replacement should not require reprogramming. If the key doesn't work afterward, check battery polarity, battery type, electrical contacts, and whether the casing has been correctly reassembled.

Why does my Toyota Hilux key fob only work close to the car?

Reduced remote range is one of the symptoms of a depleted key battery identified in Toyota's Hilux documentation. Replacing the battery is therefore a good first troubleshooting step.

Final Thoughts

A Toyota Hilux key battery replacement is a quick DIY task that can solve reduced remote range, intermittent locking and unlocking, unreliable Smart Entry operation, and low-key-battery warnings.

The biggest mistake we can make is assuming every Hilux uses the same battery.

For many recent models, the general rule is:

Toyota Hilux without Smart Entry & Start: CR1620

Toyota Hilux with Smart Entry & Start: CR2032

However, older keys can use different battery types, so checking the existing battery or owner's manual remains the most reliable method.

Once we have the correct battery, replacement generally takes only a few minutes. Open the casing carefully, note the old battery orientation, install the new cell without disturbing the internal electronics, reassemble the key, and test all functions.

If the Toyota Hilux key still doesn't work after fitting a fresh battery, we can then investigate battery contacts, key damage, vehicle receiver issues, or smart-key system faults rather than immediately assuming the key needs expensive replacement or reprogramming.

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