The process involves replacing the depleted power source within a device used for remote vehicle access and operation. This action restores the functionality of features like remote locking/unlocking, alarm activation/deactivation, and sometimes, remote start capabilities. Successfully completing this procedure ensures continued convenient access to a vehicle without requiring manual key usage.
Maintaining a functional remote entry system provides several advantages. It enhances security by allowing users to quickly lock their vehicle from a distance, minimizing the risk of theft or unauthorized entry. Furthermore, it offers convenience, particularly in adverse weather conditions, enabling users to unlock their vehicle before reaching it. Historically, remote entry systems have evolved from simple locking mechanisms to sophisticated devices with advanced security features, contributing significantly to modern vehicle convenience and safety.
The subsequent sections will provide a detailed guide on the tools required, step-by-step instructions for accessing the internal components, and the proper method for installing a new power cell. It will also outline precautions to avoid damage to the device during the replacement process, and troubleshooting steps for common issues that may arise.
1. Tools
The successful completion of a battery replacement for a Subaru key fob hinges significantly on the availability and correct application of appropriate tools. The absence of suitable tools can lead to damage to the device’s delicate internal components, rendering it inoperable. Typically, a small, flat-head screwdriver or a plastic prying tool is required to open the key fob casing without causing scratches or breakage. The correct size screwdriver ensures efficient access to the battery compartment. Furthermore, having a replacement battery of the correct type, frequently a CR2032, is essential; using an incorrect battery will prevent the key fob from functioning.
For example, attempting to force the casing open with an inappropriately sized screwdriver could result in cracked plastic or damaged internal circuitry. Similarly, using a metallic tool instead of a plastic prying tool increases the risk of short-circuiting the device’s electronics. Proper preparation includes having a clean, well-lit workspace and potentially a small container to hold screws or other small parts removed during the process. Neglecting these preparatory steps can lead to lost components and a more complex reassembly process. Some key fobs have a small screw holding them together. A correctly sized Phillips head screwdriver is required to remove the screw, which could cause damage to the screw head if the wrong size screwdriver is used.
In summary, the selection and use of appropriate tools is not merely a convenience, but a critical determinant of the outcome when undertaking a battery replacement. Correct tool selection facilitates a smooth and damage-free procedure, minimizing the risk of device malfunction and ensuring the continued functionality of the remote entry system. Without the right tools, the key fob could be rendered unusable, defeating the purpose of the replacement.
2. Disassembly
Disassembly constitutes a critical phase in the process, directly influencing the success of the battery replacement. The term refers to the careful and methodical separation of the key fob’s components to access the battery compartment. Improper disassembly, such as using excessive force or incorrect tools, can result in damage to the casing, internal circuitry, or the battery terminals themselves, ultimately rendering the device inoperable. The correct execution of this phase is therefore essential for the subsequent replacement and reassembly steps to proceed without complications.
The process typically involves using a small, flat-head screwdriver or a plastic pry tool to gently separate the two halves of the key fob casing. Some models may have a small screw securing the casing, which must be removed before attempting separation. The location of this screw varies depending on the specific model of the Subaru key fob. For example, certain models require sliding off a physical key blade to reveal the access point. A failure to identify and address any screws or locking mechanisms before attempting to pry the casing apart can lead to cracks, breaks, or irreparable damage to the devices housing. The internal components are often delicate and can be easily damaged if not handled with care.
In conclusion, disassembly is not merely a preliminary step but an integral component of the overall battery replacement procedure. A deliberate and cautious approach, employing the appropriate tools and techniques, is vital to ensure the integrity of the key fob and facilitate a successful battery replacement. Rushing or neglecting proper disassembly techniques can lead to costly repairs or the complete loss of remote functionality, thereby undermining the purpose of the battery replacement itself.
3. Battery Type
The selection of the appropriate battery type is paramount for the successful execution of the procedure. Using an incorrect battery will render the device inoperable or potentially damage the internal circuitry. The specifications of the original equipment manufacturer dictate the required battery characteristics for optimal performance.
-
Voltage Compatibility
The specified voltage of the replacement battery must match the original battery’s voltage. Deviations from the required voltage can cause erratic behavior or permanent damage to the key fob’s electronic components. For example, if the key fob requires a 3V battery, substituting it with a 1.5V battery will result in the device not functioning. Conversely, using a battery with higher voltage can cause irreversible harm to the electronics. The CR2032 battery, common in many Subaru key fobs, is a 3V battery, and only this voltage should be used.
-
Physical Dimensions
The physical dimensions of the replacement battery must be identical to those of the original battery. A battery that is too large will not fit within the designated compartment, preventing the key fob from closing properly. A battery that is too small may not make proper contact with the terminals, resulting in intermittent or non-existent functionality. The CR2032 battery is a standardized size, 20mm in diameter and 3.2mm thick, and any replacement must adhere to these dimensions.
-
Battery Chemistry
The chemical composition of the battery influences its lifespan, performance in varying temperatures, and overall reliability. Lithium batteries, such as the CR2032, are preferred for their long shelf life, stable voltage output, and resistance to temperature fluctuations. Using a battery with a different chemistry may result in reduced battery life or unpredictable performance. Furthermore, some battery chemistries can leak corrosive substances if they fail, potentially damaging the key fob.
-
Amperage (mAh)
The amperage (mAh) determines how long the battery last before needing to be replaced. Using higher amperage will ensure that the user will not have to perform the steps in “how to change battery in subaru key fob” sooner than usual. For example, using CR2032 with 225 mAh will perform better in term of long lasting life cycle compare to the standard CR2032 battery with 220 mAh.
Selecting the correct battery type, encompassing voltage, dimensions, chemistry, and amperage, is not a trivial detail but a fundamental requirement for ensuring the continued functionality and longevity of the Subaru key fob. Neglecting these specifications can lead to device malfunction, damage, or even the need for a complete key fob replacement, thereby emphasizing the importance of adhering to the manufacturer’s recommendations. The proper identification and installation of the correct battery type is, therefore, integral to the successful execution of the process.
4. Polarity
Correct battery polarity is a critical aspect when executing a battery replacement. The term refers to the proper orientation of the positive (+) and negative (-) terminals of the battery with respect to the corresponding terminals within the key fob. Reversing polarity, installing the battery with the positive and negative ends in the incorrect orientation, can have detrimental effects on the device.
-
Circuit Completion
Electronic circuits require a specific direction of current flow to operate correctly. The battery serves as the power source, and its polarity dictates the direction of electron movement. Reversing the polarity disrupts this intended flow, preventing the circuit from completing and thus rendering the key fob inoperative. For instance, if the positive terminal of the battery is connected to the negative terminal contact within the key fob, the circuit will not function, and the remote will fail to transmit signals.
-
Component Damage
In addition to preventing proper operation, reversed polarity can cause damage to the key fob’s internal components. Sensitive electronic components, such as integrated circuits and microprocessors, are designed to operate within a specific voltage range and polarity. Applying reverse voltage can lead to overheating, component failure, and potentially irreversible damage to the device. Over time, such damage may manifest as reduced range, intermittent operation, or complete failure of the remote functionality.
-
Safety Considerations
Although not a primary concern in low-voltage devices like key fobs, incorrect polarity can, in some cases, lead to safety issues. In more complex circuits, reversed polarity can cause short circuits, potentially leading to overheating or, in extreme cases, even fire. While the risk is minimal in key fobs, adhering to proper polarity is a fundamental safety practice when working with any electronic device.
-
Long-Term Reliability
Even if the key fob appears to function momentarily with reversed polarity, the long-term reliability of the device can be compromised. The subtle stress placed on the internal components due to reversed voltage can lead to premature failure. Components may degrade more rapidly, resulting in reduced lifespan and the need for more frequent battery replacements or even complete key fob replacement. Proper polarity ensures the key fob operates within its designed parameters, maximizing its lifespan and reliability.
The correct orientation of the battery within the device is not merely a matter of convenience but is essential for its proper function, safety, and longevity. The steps outlined in “how to change battery in subaru key fob” must emphasize the significance of observing the indicated positive and negative markings to prevent any of the aforementioned adverse consequences. Ignoring polarity can negate the purpose of the battery replacement, resulting in a non-functional or damaged key fob.
5. Reassembly
Reassembly represents the concluding, yet crucial, stage in the battery replacement process. It entails the careful and precise reconstruction of the device after the new power source has been correctly installed. Improper reassembly can negate the benefits of a correctly installed battery and potentially damage the internal components.
-
Component Alignment
Successful reassembly hinges on ensuring that all internal components are correctly aligned within the key fob casing. This includes ensuring that the battery is securely held in place by the battery terminals, and that any buttons or contact points are properly positioned to make contact with the internal circuitry. Failure to properly align these components can result in intermittent functionality or complete failure of the device. For example, if the button contacts are not correctly positioned, the buttons may not register when pressed, preventing the user from locking or unlocking the vehicle. Incorrect alignment will mean repeating “how to change battery in subaru key fob” steps.
-
Casing Closure
The secure closure of the key fob casing is essential for protecting the internal components from environmental factors such as moisture and dust. The casing must be snapped or screwed together correctly, ensuring a tight seal to prevent contaminants from entering. Gaps or loose closures can allow moisture ingress, leading to corrosion of the internal circuitry and eventual failure of the device. Overtightening screws, if present, can crack the plastic housing. A properly sealed casing also prevents the accidental dislodging of the battery, which could interrupt the power supply and render the key fob unusable. In “how to change battery in subaru key fob” steps, ensure all parts are there.
-
Screw Management
Some key fob designs incorporate small screws to secure the casing. Proper management of these screws during reassembly is critical to prevent damage to the device. Screws must be tightened to the correct torque to ensure a secure closure without stripping the screw threads or cracking the plastic housing. Losing screws during disassembly can compromise the structural integrity of the key fob, leading to loose connections and potential failure. The correct screwdriver bit must also be used to avoid damaging the head of the screws, which can make subsequent reassemblies difficult. Follow “how to change battery in subaru key fob” steps accordingly.
-
Testing Functionality
Post-reassembly testing is a vital step to confirm the successful completion of the battery replacement. The user should test all functions of the key fob, including locking, unlocking, panic alarm, and remote start (if equipped), to ensure that they are operating correctly. If any functions are not working as expected, it may indicate that there is an issue with component alignment, battery contact, or a damaged circuit board. Further disassembly and inspection may be necessary to identify and resolve the problem. Testing immediately after reassembly helps identify problems before the key fob is needed in a critical situation.
Reassembly, therefore, is not merely the reverse of disassembly but a deliberate and methodical process requiring attention to detail and careful handling of delicate components. Proper alignment, secure casing closure, correct screw management, and thorough testing are all crucial for ensuring the reliable and continued functionality of the key fob following a battery replacement, reinforcing the importance of each step when performing “how to change battery in subaru key fob”.
6. Testing
The act of testing a Subaru key fob following battery replacement is an indispensable component of the overall procedure. It serves as the definitive validation of the steps taken. The successful completion of battery replacement, as outlined in instructions on how to change battery in subaru key fob, is only proven through rigorous evaluation of the device’s functionality post-reassembly.
Testing acts as a direct cause-and-effect verification. A freshly installed battery, properly oriented and connected, should result in the key fob operating as intended. If pressing the lock button does not lock the vehicle, this serves as an immediate indication that an error occurred during the battery replacement process. Perhaps the battery polarity was reversed, the battery is defective, or the internal contacts are not making sufficient contact. Without this verification step, potential issues could remain undetected until a critical situation arises, such as being unable to unlock the vehicle remotely in an emergency. A real-world example demonstrates this point: A vehicle owner replaces the battery, neglects to test the fob, and later finds themselves stranded in a parking lot because the remote unlock function is non-operational.
Thorough testing should encompass all available functions: remote locking, remote unlocking, panic alarm activation, trunk release, and, if equipped, remote start. A systematic approach, verifying each function individually, provides a comprehensive assessment of the key fob’s operational status. Failure to properly test renders the execution of the replacement incomplete, leaving the user with a false sense of security. The practical significance of incorporating testing into the how to change battery in subaru key fob procedure cannot be overstated, as it directly contributes to the reliability and peace of mind associated with remote vehicle access.
7. Precautions
Adherence to precautionary measures is paramount when executing battery replacement. These safeguards minimize the potential for damage to the key fob or personal injury during the maintenance procedure, directly impacting the effectiveness of how to change battery in subaru key fob.
-
Static Discharge Mitigation
Electrostatic discharge (ESD) can damage sensitive electronic components within the key fob. Prior to handling the internal circuitry, grounding oneself by touching a grounded metal object, such as a computer case, can dissipate any accumulated static charge. This prevents the transfer of static electricity to the key fob components, mitigating the risk of damage. For instance, touching a doorknob, especially in dry environments, does not provide adequate grounding and may still result in ESD. Implementing this precaution is integral to ensuring the longevity of the key fob after battery replacement and essential to the instructions outlined in how to change battery in subaru key fob.
-
Tool Selection and Application
The selection and appropriate use of tools are crucial to prevent physical damage to the key fob casing and internal components. Using an overly aggressive tool, such as a large metal screwdriver, can scratch or crack the plastic casing, or damage the delicate circuitry within. Employing plastic pry tools or small, precision screwdrivers designed for electronic devices minimizes the risk of such damage. For example, attempting to force the casing open with an improperly sized screwdriver can break the plastic clips that hold the casing together. Selection of the appropriate tool will allow a safe separation during the instructions within how to change battery in subaru key fob.
-
Battery Handling and Disposal
Improper handling and disposal of batteries pose potential risks. Batteries can contain corrosive chemicals that can cause skin irritation or damage to the environment if not handled and disposed of correctly. Avoid touching the battery terminals with bare hands, and always dispose of used batteries in accordance with local regulations, often involving designated battery recycling programs. Ingesting a button cell battery, commonly used in key fobs, can cause serious internal injuries. Secure the battery packaging away from children or pets, as mentioned in the instructions during how to change battery in subaru key fob.
-
Work Surface and Environment
Conducting the battery replacement on a clean, well-lit, and stable work surface minimizes the risk of losing small parts or damaging the key fob. A cluttered or unstable surface increases the likelihood of dropping screws or other small components, making reassembly difficult. Adequate lighting ensures clear visibility of the internal circuitry, reducing the risk of accidental damage. For instance, performing the battery replacement in a dimly lit area increases the chance of misaligning components or overlooking small details. Ensure that a stable and well lit service is used for how to change battery in subaru key fob instructions.
These precautionary measures, encompassing static discharge mitigation, tool selection, battery handling, and workspace preparation, are indispensable for minimizing risks and maximizing the success of the maintenance procedure described in how to change battery in subaru key fob. Failure to observe these precautions can result in damage to the key fob or personal injury, thereby undermining the effectiveness of the battery replacement process.
8. Synchronization
Synchronization, in the context of replacing a battery in a Subaru key fob, refers to the process of re-establishing communication between the key fob and the vehicle’s onboard computer system. While not always required, certain Subaru models may lose their programmed connection to the key fob when the battery is removed, necessitating a re-synchronization procedure for the device to function correctly.
-
Loss of Pairing
Battery replacement can, in some Subaru models, result in a temporary loss of the key fob’s programmed identification within the vehicle’s system. This occurs because the memory storing the key fob’s unique code relies on continuous power. Removal of the battery disrupts this power supply, potentially erasing the stored code. This loss of pairing means the vehicle no longer recognizes the key fob as an authorized device, preventing remote locking, unlocking, and starting. If this occurs when “how to change battery in subaru key fob” has been completed, the process must take place.
-
Resynchronization Methods
Resynchronization typically involves a specific sequence of actions performed within the vehicle, such as inserting the key into the ignition, turning it to the “on” position, and pressing certain buttons on the key fob. The exact procedure varies depending on the Subaru model and year. This process allows the vehicle’s computer to relearn the key fob’s unique identification code, re-establishing communication and restoring functionality. Detailed instructions for the specific vehicle model are generally found in the owner’s manual.
-
Diagnostic Indicators
The need for synchronization is often indicated by specific symptoms after a battery replacement. These may include the inability to lock or unlock the doors remotely, failure of the panic alarm to activate, or the vehicle not recognizing the key fob for starting. Additionally, the security indicator light on the dashboard may flash or remain illuminated, signaling a communication problem between the key fob and the vehicle’s system. These indicators confirm the need to refer to the “how to change battery in subaru key fob” instructions on synchronization.
-
Professional Assistance
In situations where the resynchronization procedure outlined in the owner’s manual fails, professional assistance may be required. A qualified automotive technician, equipped with specialized diagnostic tools, can diagnose the problem and reprogram the key fob to the vehicle’s system. This may involve accessing the vehicle’s computer system and manually entering the key fob’s identification code. Such a step is beyond the scope of typical “how to change battery in subaru key fob” documentation, underlining its importance to hire someone who knows what they are doing.
In summary, synchronization is a relevant consideration when addressing battery replacement. While not a universal requirement across all Subaru models, awareness of this potential issue and the appropriate resynchronization methods ensures the continued functionality of the key fob and the remote vehicle access system. Consulting the owner’s manual for specific instructions and recognizing the indicators of a synchronization problem are crucial steps in maintaining the seamless operation of the vehicle.
Frequently Asked Questions
This section addresses common inquiries regarding the process of replacing the battery in a Subaru key fob. The information presented aims to provide clarity and guidance for individuals undertaking this maintenance task.
Question 1: What type of battery is typically required for a Subaru key fob?
Subaru key fobs generally utilize a CR2032 type battery. Verification of the specific battery type required for a particular key fob model can be found within the owner’s manual or by inspecting the original battery removed from the device.
Question 2: Will replacing the battery erase the key fob’s programming?
In some Subaru models, battery replacement may result in the loss of the key fob’s programming. If the vehicle fails to recognize the key fob after battery replacement, a resynchronization procedure, as outlined in the owner’s manual, may be required.
Question 3: What tools are necessary for a battery replacement?
A small, flat-head screwdriver or a plastic pry tool is generally sufficient to open the key fob casing. Certain models may also require a small Phillips head screwdriver to remove any retaining screws.
Question 4: Is it possible to damage the key fob during battery replacement?
Yes, improper handling or the use of incorrect tools can damage the key fob. Caution and adherence to proper procedures are essential to prevent damage to the casing, internal circuitry, or battery terminals.
Question 5: How should the old battery be disposed of?
Used batteries should be disposed of in accordance with local regulations. Many communities offer designated battery recycling programs. Improper disposal can pose environmental risks.
Question 6: What should be done if the key fob still does not work after replacing the battery?
If the key fob remains inoperable after battery replacement and resynchronization, the device may require professional diagnosis and reprogramming. Contacting a qualified automotive technician is recommended in such instances.
Proper execution of a battery replacement hinges on adherence to established procedures and caution during each step. These answers are provided to clarify common concerns and facilitate a successful maintenance experience.
The subsequent section will provide a concise summary of the main points covered in this article.
Expert Insights
The following recommendations provide enhanced guidance for executing a battery replacement, ensuring both device integrity and continued functionality.
Tip 1: Prioritize Correct Battery Orientation: During battery installation, confirm proper polarity alignment. The positive (+) and negative (-) terminals must match the corresponding markings within the key fob casing. Reversed polarity may damage the device.
Tip 2: Employ Appropriate Tools: Utilize plastic pry tools or small, precision screwdrivers designed for electronic devices. Avoid using excessive force or sharp metal objects that could scratch or damage the key fob casing or internal components.
Tip 3: Secure Screws Carefully: Key fobs with retaining screws require meticulous attention. Ensure the screws are tightened to the correct torque to secure the casing without stripping the threads or cracking the plastic housing. Damaged or stripped screws compromise the structural integrity of the key fob.
Tip 4: Prevent Static Discharge: Before handling any internal components, ground to dissipate any electrostatic discharge. Touch a grounded metal object, such as a computer case, to neutralize static charge and protect the key fob’s sensitive electronics.
Tip 5: Inspect Battery Contacts: Prior to reassembly, visually inspect the battery contacts within the key fob. Ensure that the contacts are clean, free from corrosion, and properly aligned to make secure contact with the new battery. Clean any corrosion with isopropyl alcohol.
Tip 6: Verify Complete Functionality: After reassembly, test all functions of the key fob, including remote locking, unlocking, panic alarm, and remote start (if equipped). This ensures that all features are working correctly and that the battery replacement has been successful.
Tip 7: Consult the Owner’s Manual: For specific instructions related to a particular Subaru model, refer to the vehicle’s owner’s manual. The manual provides detailed information on battery replacement and any required resynchronization procedures.
By incorporating these insights into the execution of a battery replacement, the likelihood of a successful outcome is significantly increased. The subsequent section will provide a conclusive summary of the information presented.
Conclusion
This document has comprehensively addressed the topic of how to change battery in subaru key fob, delineating essential steps, requisite tools, and critical precautions. The exploration encompassed disassembly, battery type identification, polarity observance, reassembly, functional testing, and synchronization considerations. Adherence to outlined procedures ensures both device integrity and continued system operability.
Proficient execution of the presented methodology mitigates potential damage and maintains remote vehicle access. Prioritization of detailed instructions, combined with mindful implementation, fosters a seamless and dependable battery replacement process. Ongoing diligence in key fob maintenance remains paramount for sustained vehicle security and user convenience.
