How To Open Subaru Key Fob – Master Battery Replacement & Emergency

ByRobert Lozano

A dead key fob battery can leave you stranded, but learning how to open your Subaru key fob and replace the battery is a simple DIY task. This comprehensive guide walks you through the process for various Subaru models, ensuring you can quickly get back on the road or trail with a fully functional remote.

Dealing with a unresponsive Subaru key fob can be frustrating, especially when you’re in a hurry or far from home. Many owners experience the sudden dread of a locked vehicle or an ignition that won’t respond, only to realize the issue is a simple dead battery.

This expert guide promises to equip you with the knowledge and confidence to tackle this common problem yourself. We’ll show you precisely how to open a Subaru key fob, replace its battery, and troubleshoot common issues, saving you a trip to the dealership.

By the end of this article, you’ll understand the different key fob types, the tools you need, and a clear, step-by-step process to open your remote, swap the battery, and restore full functionality, ensuring you’re always prepared.

Understanding Your Subaru Key Fob: Types and Functions

Before you begin, it’s helpful to understand the type of key fob you have and its basic operation. Subaru has used several key fob designs over the years, each with slight variations in how they are opened and maintained.

Most modern Subarus utilize either a standard “flip key” style or a “smart key” (also known as a proximity key or push-button start fob). Both types typically house a small, coin-cell battery that powers their wireless functions.

What’s Inside Your Key Fob?

At its core, a Subaru key fob contains a small circuit board, a battery, and a series of buttons. When you press a button, it sends a radio signal to your vehicle’s receiver, commanding it to lock, unlock, or perform other functions.

The battery is the lifeblood of this system. Without it, your key fob becomes a fancy paperweight, or at best, a housing for a mechanical emergency key.

Common Signs of a Dead Key Fob Battery

Recognizing the symptoms of a dying battery can prevent you from being caught off guard. Don’t wait until your key fob is completely dead to address the issue.

Here are some common indicators:

  • Reduced Range: You have to be closer to your vehicle for the remote to work.

  • Intermittent Operation: The lock/unlock buttons only work sometimes, or require multiple presses.

  • Warning Light on Dash: Many newer Subaru models will display a “low key fob battery” warning light.

  • Delayed Response: There’s a noticeable lag between pressing a button and the car reacting.

  • No Response: This is the ultimate sign – your key fob is completely dead.

If you experience any of these, it’s a good time to consider opening your Subaru key fob for a battery check or replacement.

Gathering Your Tools: What You’ll Need to Open Your Subaru Key Fob

Having the right tools on hand makes the process smooth and prevents accidental damage to your key fob casing. You likely have most of these items around your home or garage.

Avoid using overly sharp or forceful objects, as the plastic casing can be delicate.

Essential Tools for a Smooth Process

Here’s a list of what you’ll need:

  • Small Flathead Screwdriver: Ideally, a jeweler’s screwdriver or one with a very thin blade. This is crucial for prying.

  • Plastic Pry Tool (Optional but Recommended): A plastic trim removal tool or guitar pick works wonders. It helps prevent scratches and marring on the fob’s plastic.

  • New Replacement Battery: The most common battery type for Subaru key fobs is a CR2032 coin cell. Some older models might use a CR1632 or CR1620. Always check your owner’s manual or the existing battery for the correct type.

  • Clean Cloth: To wipe down the fob or battery contacts if needed.

Ensure your workspace is clean and well-lit. A soft surface, like a towel, can help prevent parts from rolling away.

Choosing the Right Replacement Battery

The CR2032 battery is widely available at most supermarkets, drugstores, and electronics shops. It’s a 3-volt lithium battery and is relatively inexpensive.

Always opt for a reputable brand to ensure longevity and consistent performance. Cheap, off-brand batteries might not last as long or deliver stable power, leading to early issues.

Step-by-Step Guide: How to Open a Subaru Key Fob (Standard & Smart Key)

The exact method for how to open a Subaru key fob varies slightly depending on whether you have a standard flip key or a smart key. We’ll cover both common types here.

Proceed carefully and avoid excessive force. The plastic tabs and internal components are fragile.

Opening the Standard (Flip) Key Fob

This type typically has a physical key that flips out. It’s common in models like the Forester, Outback, and Impreza from certain years.

  1. Remove the Emergency Key: Locate the small button or latch on the side of the fob. Press it and pull out the metal emergency key. This reveals a small slot or indentation.

  2. Locate the Pry Slot: With the emergency key removed, you’ll see a small notch or slot where the key usually sits. This is your primary access point.

  3. Gently Pry Open the Casing: Insert your small flathead screwdriver or plastic pry tool into this slot. Twist or gently pry the tool to separate the two halves of the fob casing. You should hear a slight click as the plastic clips release.

  4. Separate the Halves: Once the initial clips are loose, carefully work your way around the seam of the fob, gently prying until the two halves fully separate. Do this slowly to avoid breaking any internal tabs.

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The circuit board and battery will now be exposed. Note the orientation of the battery before removal.

Opening the Smart Key Fob (Proximity Key)

Smart keys are typically larger, rectangular, and allow for keyless entry and push-button start. They are found in newer models like the Ascent, Legacy, and Crosstrek.

  1. Remove the Emergency Key: Just like the flip key, there’s usually a small button or switch on the side of the smart key fob. Press it and pull out the metal emergency key. This often reveals a small access point.

  2. Locate the Pry Point: Often, with the emergency key removed, you’ll find a narrow slot along the seam of the key fob, sometimes right where the emergency key was housed. This is where you’ll begin to pry.

  3. Gently Pry Apart the Casing: Insert your plastic pry tool or a thin flathead screwdriver into the designated slot. Twist the tool or gently apply pressure to pop the two halves of the casing apart. Work slowly around the perimeter if necessary.

  4. Separate the Halves: Once the clips are disengaged, carefully pull the two halves of the key fob apart. Be mindful of the circuit board inside, ensuring it doesn’t fall out or get damaged.

Again, observe the battery’s orientation (which side is facing up) before you remove it.

Important Considerations for Older Models

Some older Subaru models might have slightly different fob designs, potentially requiring a small Philips head screwdriver to remove a screw before prying. Always inspect your specific key fob carefully for any screws or alternative opening mechanisms.

If you encounter resistance, stop and consult your vehicle’s owner’s manual or search for a specific guide for your Subaru year and model. Forcing it can lead to irreparable damage.

Replacing the Battery: A Quick & Easy Swap

Once you’ve successfully opened your Subaru key fob, replacing the battery is the easiest part of the process. This is where your new CR2032 (or other specified type) battery comes into play.

Handle the circuit board by its edges to avoid touching sensitive components.

Removing the Old Battery

  1. Note Battery Orientation: Before touching anything, take a mental note or even a quick picture of how the old battery is seated. Typically, the positive (+) side faces up or towards you.

  2. Gently Pry Out the Old Battery: Use your plastic pry tool or the small flathead screwdriver to gently lift the old coin-cell battery out of its compartment. It’s usually held in place by small clips or a snug fit.

  3. Inspect Contacts: While the battery is out, quickly check the metal contacts within the battery compartment. Ensure they are clean and free of corrosion. If you see any residue, gently wipe it with a clean, dry cloth.

Avoid touching the new battery with bare fingers too much, as oils from your skin can reduce its lifespan.

Installing the New Battery Correctly

  1. Insert New Battery: Place the new battery into the compartment, ensuring the correct orientation (usually positive side up, matching how the old battery was positioned). It should fit snugly.

  2. Secure the Battery: Press down gently on the battery until it clicks into place under its retaining clips. Make sure it’s seated firmly and doesn’t wiggle.

Incorrect battery orientation is a common reason for a key fob not working after replacement.

Reassembling Your Key Fob

  1. Align the Halves: Carefully align the two halves of the key fob casing. Ensure the circuit board is properly seated and hasn’t shifted.

  2. Snap Together: Gently press the two halves together until you hear and feel them click securely into place. Start from one end and work your way around, ensuring all clips engage.

  3. Reinsert Emergency Key: Slide the metal emergency key back into its slot until it clicks and locks into position.

  4. Test Functionality: Immediately test your key fob. Try locking and unlocking your car from a short distance. If it works, you’ve successfully replaced the battery!

If the key fob doesn’t snap together easily, don’t force it. Re-align the internal components and try again. Something might be misaligned.

Troubleshooting Common Issues After Opening Your Key Fob

Even after carefully following the steps on how to open a Subaru key fob and replace the battery, you might encounter some issues. Don’t panic; most problems have simple solutions.

Patience is key when troubleshooting electronic components.

Key Fob Not Working After Battery Replacement

If your key fob remains unresponsive after a new battery, consider these possibilities:

  • Incorrect Battery Orientation: Double-check that the positive (+) and negative (-) sides of the battery are installed correctly. This is the most frequent culprit.

  • Dead New Battery: Although rare, it’s possible you received a faulty or old “new” battery. Try another fresh battery if available.

  • Poor Battery Contact: Ensure the battery is making firm contact with the metal terminals inside the fob. Gently bend the terminals slightly outwards if they seem too flat.

  • Fob Reprogramming: Some Subaru models, especially after a prolonged period with a dead battery, might require a simple re-syncing procedure. This often involves a sequence of locking/unlocking the car or pressing certain buttons. Consult your owner’s manual for specific instructions for your model year.

  • Damaged Circuit Board: In rare cases, the circuit board itself might be damaged, perhaps from a drop or water exposure. If all else fails, this might be the issue.

Always try the simplest solutions first before moving to more complex ones.

Dealing with a Stuck or Damaged Fob Casing

If the casing is difficult to open or seems damaged:

  • Check for Hidden Screws: Some older or aftermarket fobs might have tiny screws under a sticker or within the emergency key slot. Inspect thoroughly.

  • Avoid Excessive Force: If the casing won’t budge, don’t force it. You risk breaking the plastic tabs or cracking the housing. Re-evaluate your pry points.

  • Consider Professional Help: If you suspect the casing is damaged internally or you simply cannot get it open, it might be time to visit a Subaru dealership or an automotive locksmith. They have specialized tools and expertise to handle delicate electronics.

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A damaged casing can compromise the fob’s weather resistance, leading to future issues.

What to Do if You Lose Your Emergency Key

The emergency key is vital for accessing your vehicle manually if the fob battery dies or fails. If you’ve lost it:

  • Contact Subaru Dealership: Your local Subaru dealer can cut and program a new emergency key based on your VIN. This is the safest and most reliable method.

  • Automotive Locksmith: Some specialized automotive locksmiths can also cut and program replacement keys. Verify their experience with Subaru models.

Always keep a spare emergency key in a safe, accessible place, especially if you’re an off-roader who might be far from assistance.

Pro Tips for Key Fob Longevity & Care

As experienced mechanics and outdoor enthusiasts, we know that proper care extends the life of all your gear, including your key fob. A little preventative maintenance goes a long way.

Treat your key fob like a delicate piece of electronics, because it is.

Protecting Your Fob in Harsh Environments

  • Water Protection: If you’re an off-roader or spend time near water, consider a waterproof case for your key fob. Even small amounts of moisture can corrode the circuit board and battery contacts. A key fob failure deep on a trail is a serious problem.

  • Impact Resistance: Avoid dropping your key fob. The internal components, especially the solder joints on the circuit board, can be fragile. A silicone cover can add a layer of protection against drops and scratches.

  • Extreme Temperatures: Don’t leave your key fob in direct sunlight on your dashboard or in extremely cold conditions for extended periods. Temperature extremes can degrade battery life and affect electronic performance.

  • Electromagnetic Interference: Keep your key fob away from strong electromagnetic fields, which can sometimes interfere with its signal or even reprogram it incorrectly.

These simple precautions can significantly extend the life of your key fob and prevent unexpected failures.

When to Seek Professional Help

While learning how to open a Subaru key fob for battery replacement is a straightforward task, there are times when professional intervention is best:

  • Persistent Issues: If your key fob still doesn’t work after multiple battery replacements and troubleshooting attempts, the issue might be with the internal electronics or the vehicle’s receiver.

  • Physical Damage: If the key fob casing is severely broken, the buttons are stuck, or you suspect water damage, a new fob or professional repair is likely needed.

  • Reprogramming Difficulties: Some newer or more complex key fobs might require specialized diagnostic tools for reprogramming, which only a dealership or advanced automotive locksmith will possess.

Don’t hesitate to contact your Subaru dealership or a trusted automotive locksmith if you’re out of options. They can diagnose complex issues and provide genuine replacement parts.

Frequently Asked Questions About Subaru Key Fobs

How long do Subaru key fob batteries usually last?

Typically, a Subaru key fob battery (like a CR2032) lasts between 2 to 4 years. Factors like frequency of use, temperature exposure, and battery brand can influence its lifespan. Newer models with more features might drain batteries slightly faster.

Can I use any CR2032 battery for my Subaru key fob?

Yes, as long as it’s a standard CR2032 3-volt lithium coin cell battery from a reputable brand, it should work perfectly. Ensure it’s fresh and not expired.

Do I need to reprogram my key fob after changing the battery?

In most cases, no. Simply changing the battery in your Subaru key fob does not usually require reprogramming. The internal memory stores the pairing information. However, if the fob was dead for a very long time, or if you still experience issues, a simple re-syncing procedure (often detailed in your owner’s manual) might be necessary. Full reprogramming is rare for just a battery swap.

What if my key fob gets wet?

If your key fob gets wet, immediately open it (if possible without further damage), remove the battery, and allow all components to air dry completely for at least 24-48 hours in a warm, dry place (not direct heat). You can place it in a bowl of uncooked rice or desiccant packets to absorb moisture. Reinstall a new battery after it’s thoroughly dry. If it still doesn’t work, corrosion might have damaged the circuit board, requiring a replacement fob.

Where can I get a replacement emergency key for my Subaru?

You can obtain a replacement emergency key from your authorized Subaru dealership. They can cut a new key using your vehicle’s VIN. Some specialized automotive locksmiths may also be able to assist, but always verify their experience with Subaru keys.

Conclusion

Mastering how to open a Subaru key fob and replace its battery is a valuable skill for any Subaru owner. It’s a simple, cost-effective DIY task that can save you time, money, and the frustration of being stranded.

By following these detailed steps, you can confidently maintain your key fob, ensuring reliable access to your vehicle whether you’re heading to work or embarking on your next off-road adventure. Remember to use the right tools, be gentle, and always have a spare battery on hand.

Don’t let a dead key fob battery catch you off guard again. Take control of your vehicle’s maintenance and keep your Subaru running smoothly. Stay safe, stay prepared, and keep exploring!

Robert Lozano
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