Replace Access Key Battery In Subaru: Easy DIY Instructions With No Tools Needed [Updated On- 2025]

To replace your Subaru key fob battery, get a CR2032 battery. First, find and remove the emergency key from the fob. Use a small screwdriver to gently open the key fob. Replace the old battery with the new one, ensuring it is oriented correctly. Snap the fob back together and reinsert the emergency key. It’s a quick and easy DIY guide!

After replacing the battery, snap the fob back together. Confirm that it clicks securely into place. Test the key fob to ensure it works correctly. If the buttons function properly, you have successfully replaced the access key battery without any tools.

Now that you have completed this easy DIY task, it’s important to understand how to maintain the battery life of your key fob. Regular checks can prevent unexpected battery failures. Additionally, knowing the signs of a failing battery can save you time and inconvenience in the future. In the next section, I will discuss the symptoms of a dying key fob battery and tips to prolong its lifespan, ensuring you stay connected to your Subaru at all times.

# Table of Contents

What Is an Access Key Battery in a Subaru, and Why Is It Important?

An access key battery in a Subaru is a small power source that enables the key fob to communicate with the vehicle’s locking and ignition systems. This battery is essential for operating functions like remote unlocking and starting the engine without a traditional key.

According to the Subaru Owner’s Manual, the access key battery is crucial for the functionality of features like keyless entry and engine start. It enhances convenience and security for drivers.

The access key battery operates by sending signals to the vehicle when buttons are pressed. A depleted battery can prevent locking or unlocking the doors and starting the engine. Regular replacement ensures ongoing functionality.

The National Highway Traffic Safety Administration (NHTSA) states that key fob batteries should be replaced every one to two years, depending on usage. This consistent maintenance prevents key-related issues.

Common causes of battery depletion include frequent use and extreme temperature exposure. Fluctuations in climate can affect battery performance and lifespan.

A study from the Battery Research Institute indicates that the average lifespan of a key fob battery is around two to three years. Users are advised to monitor the battery and replace it as needed to avoid problems.

Failing to replace an access key battery can lead to vehicle accessibility issues and can limit security features. This may lead to a higher risk of theft or inconvenience, especially in emergencies.

These impacts affect daily life and can lead to increased frustration for drivers. The need for functional access keys is vital for vehicle reliability and security.

To address battery issues, drivers should regularly check their key fob batteries and know the replacement process. Recommendations from automotive experts suggest carrying a spare battery.

Using lithium batteries can improve key fob longevity. Emerging technologies also enable contactless charging solutions, potentially minimizing need for battery replacement in the future.

How Can You Identify When Your Subaru Access Key Battery Needs Replacing?

You can identify when your Subaru access key battery needs replacing by observing specific warning signs and symptoms. These signs indicate that the battery is weakening and may require immediate replacement.

Diminished Range: If you find that you need to be closer to your vehicle for the key to work, the battery is likely dying. New batteries typically offer a range of several feet, but a reduction in this distance signals a weak battery.
Warning Light: Many Subaru models have a warning light on the dashboard that illuminates when the access key battery is low. This light serves as a direct indicator that maintenance is needed.
Unresponsive Buttons: If the buttons on your access key require multiple presses to function or do not work at all, it is a clear sign that the battery is failing.
Intermittent Functionality: If your access key occasionally works and then fails, this inconsistency is often due to a battery that is nearing the end of its life.

These signs can help you proactively replace the battery before it completely fails, ensuring uninterrupted access to your Subaru vehicle. Regular checks of your access key can enhance your overall experience and prevent inconvenience.

What Are the Steps to Replace the Access Key Battery in Your Subaru Fob?

To replace the access key battery in your Subaru fob, follow these steps:

Gather required tools (flathead screwdriver or coin).
Open the key fob.
Remove the old battery.
Insert the new battery.
Reassemble the key fob.

Various opinions exist regarding key fob battery replacement. Some people prefer professional assistance, citing the complexity of modern key fobs. Others advocate for DIY methods, emphasizing cost-effectiveness and ease. Some key fobs may have unique requirements based on model year, while most Subaru fobs generally use the same battery types.

Gather Required Tools:
Gather required tools before starting the battery replacement process. A flathead screwdriver or a coin will be necessary to open the key fob securely. Ensuring you have the proper tools simplifies the process and reduces the risk of damaging the key fob.
Open the Key Fob:
Open the key fob to access the battery compartment. Insert the flathead screwdriver or coin into the designated slot on the side of the fob. Gently twist to separate the two halves of the fob. Take care not to apply too much force to avoid damaging the casing.
Remove the Old Battery:
Remove the old battery from the compartment. Pay attention to the battery orientation, noting the positive and negative sides. Discard the old battery responsibly, following local guidelines for battery disposal.
Insert the New Battery:
Insert the new battery into the compartment with the correct orientation. Ensure that it fits snugly and that the terminals make proper contact with the fob’s connectors. Most Subaru fobs require a CR2032 battery, but consult your user manual for specific details on your model.
Reassemble the Key Fob:
Reassemble the key fob once the new battery is in place. Align the two halves of the fob and press firmly until you hear a click, indicating it is securely closed. Test the key fob to ensure the new battery works properly by locking and unlocking your vehicle.

By following these steps, you can successfully replace the access key battery in your Subaru fob with ease.

How Do You Open the Access Key Fob for Battery Replacement?

To open the access key fob for battery replacement, locate the small slot on the side of the fob, insert a flat tool, and gently pry it apart.

Here are the detailed steps for this process:

Locate the Slot: Find the small groove or slot on the edge of the key fob. This slot is usually designed for easy separation of the two halves of the fob.
Insert a Tool: Use a flat tool, such as a small screwdriver or a coin, to insert into the slot. The tool should fit snugly but not forcefully to prevent damage to the fob.
Pry Apart: Gently twist or lift the tool to create a gap. Work slowly to avoid breaking the plastic casing. Once there is enough space, continue to pull the two halves apart with your fingers.
Remove the Old Battery: After separating the fob, locate the battery compartment. Remove the old battery from its slot. Make sure to take note of the battery’s orientation, as this will be important when placing the new battery.
Insert New Battery: Place the new battery in the same orientation as the old one. Ensure it fits snugly and is not loose in the compartment.
Reconnect the Fob: Align the two halves of the fob and press them together firmly. Make sure they click into place, ensuring the fob is sealed properly.
Test the Fob: Finally, test the key fob to ensure it is working correctly. Press the buttons to confirm functionality.

By following these steps carefully, you can successfully open your access key fob and replace the battery, ensuring your key fob functions properly.

What Type of Battery Does Your Subaru Access Key Require?

The Subaru access key requires a CR2032 battery.

Battery type: CR2032
Battery specifications: 3V lithium, 20mm diameter, 3.2mm thickness
Replacement frequency: Every 2-3 years, depending on usage
Alternative batteries: CR2025 (not recommended)

Considering these factors can help ensure you make the best choice for your Subaru access key.

Battery Type – CR2032:
The battery type required for your Subaru access key is the CR2032. The CR2032 is a 3V lithium battery. It is widely available and commonly used in various electronic devices. This battery type is suitable due to its size and voltage, providing the necessary power for keyless entry systems.
Battery Specifications – 3V Lithium:
The CR2032 battery specifications include a 20mm diameter and a 3.2mm thickness. These dimensions are standard, ensuring a proper fit in the access key. The lithium composition allows for a longer shelf life and consistent performance compared to alkaline batteries.
Replacement Frequency – Every 2-3 Years:
You should generally replace the battery in your Subaru access key every 2-3 years. This timeline depends on the usage of the key. Frequent use may cause the battery to deplete faster. Observing signs of reduced range or unresponsive buttons can indicate the need for battery replacement sooner.
Alternative Batteries – CR2025:
Although the CR2025 battery is similar in size (20mm diameter and 2.5mm thickness), it is not recommended for use in the Subaru access key. Using a CR2025 may result in poor performance due to its lower capacity. Always choose the CR2032 for optimal functionality.

How Should You Properly Insert the New Battery into the Access Key?

To properly insert a new battery into an access key, follow these steps: First, identify the type of battery your key requires. Most vehicle access keys use CR2032 batteries. Begin by opening the key fob. Locate the small slot or seam on the edge of the key fob. Insert a flat object, such as a screwdriver, into this slot to gently pry open the fob.

Once the fob is open, observe the battery orientation. Note the positive (+) and negative (-) sides. Remove the old battery, typically by pushing it out with your finger. Then, place the new battery in the same orientation as the old one, ensuring the positive side faces up in most key fobs. Close the fob until it clicks securely.

For common vehicles, the process is similar across brands like Honda, Ford, and Subaru, which often use CR2032 batteries as well. Battery life varies, averaging about 1-3 years, based on usage frequency. Factors impacting battery life include how often the key is used, exposure to extreme temperatures, and the age of the key fob.

In scenarios where the key fob does not function after replacing the battery, ensure that the battery is correctly seated. If problems persist, consider reprogramming the fob or consulting a dealership.

In summary, to properly insert a new battery into an access key, open the fob, replace the old battery with the new one, and ensure it is oriented correctly. Keep in mind that battery type and usage frequency can affect longevity and functionality.

What Should You Do After Replacing the Access Key Battery in Your Subaru?

After replacing the access key battery in your Subaru, you should follow specific steps to ensure proper functionality.

Test the key fob.
Reprogram the key fob if necessary.
Check the car door locks and trunk release.
Dispose of the old battery properly.
Consult the owner’s manual for specific instructions.

To effectively manage the situation and ensure all functions are working optimally, let’s elaborate on each of the steps mentioned above.

Testing the Key Fob: After replacing the battery, you should test the key fob to confirm it operates the locks and starts the engine. Press each button individually to check responsiveness. Successful operation indicates the battery was replaced correctly.
Reprogramming the Key Fob If Necessary: Some Subaru models may require reprogramming of the key fob after a battery change. This process typically involves using the car’s ignition system to sync the key with the vehicle. Refer to your owner’s manual for specific reprogramming steps.
Checking the Car Door Locks and Trunk Release: Once the battery is replaced and the key fob is tested, check the functionality of the door locks and trunk release. Press the corresponding buttons to ensure they activate the locks and trunk correctly. If there is any malfunction, it may indicate a need for further troubleshooting.
Disposing of the Old Battery Properly: It’s important to dispose of the old battery in an environmentally friendly manner. Many stores offer battery recycling programs. Follow local regulations to ensure proper disposal.
Consulting the Owner’s Manual for Specific Instructions: If you encounter issues or the key fob does not operate correctly, check the owner’s manual. The manual provides valuable information and troubleshooting tips specific to your Subaru model, guiding you through potential solutions.

How Can You Extend the Life of Your Subaru Access Key Battery?

You can extend the life of your Subaru access key battery by following simple practices such as minimizing battery usage, keeping the key away from extreme temperatures, and replacing the battery promptly when it weakens.

Minimizing battery usage: Use the keyless entry function only when necessary. Each time you press the button, it consumes energy. Reducing the frequency of usage can prolong battery life.

Keeping the key away from extreme temperatures: Electronics are sensitive to temperature. Avoid exposing the key to extreme cold or heat, as high temperatures can damage the battery and low temperatures can reduce its performance.

Replacing the battery promptly: A weak battery can cause unnecessary strain on the key’s electronic components. If you notice a decrease in signal strength or functionality, replace the battery as soon as possible to avoid further issues. Subaru keys typically use a CR2032 battery, which is easy to replace.

Storing the key correctly: When not in use, store the key in a cool, dry place. This protects it from moisture and dust, which can interfere with electrical contacts. Utilizing a protective case can also shield the key from impact and environmental factors.

Performing regular checks: Periodically test the key’s functionality. If the range decreases or it requires multiple attempts to unlock the vehicle, it may be time for a battery replacement.

By following these guidelines, you can maximize the lifespan of your Subaru access key battery and ensure its reliable performance.

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