Subaru owners often enjoy the convenience of keyless entry systems that provide a seamless, secure way to enter and start their vehicles. However, when the keyless entry stops working, it can be a frustrating experience. In this comprehensive guide, we will delve into the common reasons why your Subaru’s keyless entry system may fail and offer actionable troubleshooting tips and solutions.
Understanding the Keyless Entry System
Before diving into troubleshooting, it’s essential to understand how a keyless entry system operates. Subaru’s keyless entry system allows drivers to unlock their doors and start the engine without inserting a traditional key. Instead, the system utilizes a remote key fob equipped with a radio-frequency transmitter.
When you press the button on the key fob, it sends a signal to the vehicle’s receiver, typically located near the driver’s door or antenna. If the system recognizes a valid signal, it unlocks the doors, allowing you to access your vehicle conveniently.
Common Reasons for Keyless Entry Failure
There are several reasons why your Subaru’s keyless entry system may cease to work effectively. Understanding these causes is crucial in determining the appropriate troubleshooting steps to take. Below are some common issues:
1. Dead Key Fob Battery
A dead or weak key fob battery is often the primary reason your Subaru keyless entry system may not work. Over time, the battery inside the key fob can lose its charge, leading to intermittent or complete failure of the remote.
Signs of a Failing Key Fob Battery
Some signs that your key fob battery may be dying include:
- Decreased range when trying to unlock your vehicle
- Inconsistent responses—sometimes it works, sometimes it doesn’t
2. Faulty Key Fob
If the battery is functional, the issue may be due to a faulty key fob. This could be a result of physical damage, water intrusion, or internal component failure.
How to Check for Key Fob Damage
Inspect the key fob for any visible damage, such as:
- Cracks or breaks in the casing
- Tarnished or corroded electrical contacts
3. Receiver Module Issues
The receiver module in your Subaru can also be a source of problems. If the module fails or malfunctions, it may not recognize signals sent by the key fob.
4. Software Glitches
Sometimes, a software glitch can cause your keyless entry system to malfunction. This could be related to the vehicle’s onboard computer systems, requiring a reset to restore normal functionality.
Troubleshooting Steps for Keyless Entry Issues
Now that we’ve identified potential causes, let’s explore some troubleshooting steps you can take to resolve the problem.
Step 1: Check the Key Fob Battery
The first step should always be to check the battery in your key fob.
How to Replace the Key Fob Battery
- Open the key fob casing using a small screwdriver or a coin.
- Remove the old battery, noting its orientation (positive and negative sides).
- Insert a new battery of the same type, ensuring it is oriented correctly.
- Close the key fob casing securely.
Step 2: Test the Key Fob
Once you’ve replaced the battery, test the key fob to see if it works. Stand close to your Subaru and press the unlock button several times. If it still doesn’t function, you may need to try programming the key fob again.
How to Program Your Subaru Key Fob
- Insert your key into the ignition and turn it to the “On” position without starting the engine.
- Within ten seconds, press and hold the “Unlock” button on the key fob while simultaneously pressing the “Lock” button three times.
- Release the “Unlock” button; the doors should lock and unlock, indicating successful programming.
Step 3: Inspect the Receiver Module
If the key fob is working fine, the next step is to check the vehicle’s receiver module.
Steps to Check the Receiver Module
- Ensure that the antenna connected to the receiver module is not damaged or dislodged.
- Look for blown fuses related to the keyless entry system in your vehicle’s fuse box.
Step 4: Reset the Vehicle’s Systems
If the previous steps haven’t resolved the issue, consider resetting the vehicle’s onboard computer systems.
How to Reset the Onboard Computer
- Disconnect the car battery by removing the negative terminal.
- Wait for at least 15 minutes.
- Reconnect the negative terminal and start the vehicle.
When to Seek Professional Help
If you’ve tried all the troubleshooting steps outlined above and your Subaru’s keyless entry system is still not functioning, it may be time to seek professional help.
Signs You Need Professional Help
- Persistent issues despite troubleshooting attempts
- Visible damage to the fob or receiver that’s beyond a simple fix
- Software updates or diagnostics are needed that require specialized tools
Finding a Qualified Subaru Technician
When seeking professional help, it’s essential to find a qualified technician. Look for:
- A certified Subaru dealership
- A local mechanic experienced with Subaru vehicles
Preventive Maintenance Tips for Keyless Entry Systems
To avoid issues with your Subaru’s keyless entry system in the future, consider these simple preventive maintenance tips:
1. Regularly Check the Key Fob Battery
Make it a habit to check your key fob battery every few months, especially if you notice decreasing performance.
2. Keep the Key Fob Dry and Protected
Avoid exposing the key fob to water or extreme temperatures. Store it in a safe place to prevent physical damage.
3. Schedule Regular Vehicle Maintenance
Schedule regular maintenance for your Subaru to ensure all systems, including your keyless entry, are functioning optimally.
Conclusion
Experiencing issues with your Subaru’s keyless entry system can be a frustrating ordeal, but understanding the common problems and knowing how to troubleshoot can often lead to a quick resolution. Remember to check the key fob battery first, assess the fob and receiver module for damage, and reset your vehicle’s systems when necessary. If all else fails, don’t hesitate to consult a professional technician for further assistance.
By staying proactive and following these tips, you can ensure that your keyless entry system continues to work effectively, providing you with the convenience and security you expect from your Subaru.
What might cause my Subaru keyless entry to stop working?
The keyless entry system in your Subaru can stop functioning due to several common issues. A depleted battery in your key fob is the most frequent culprit, as key fobs rely on batteries to transmit their signal to the vehicle. If you’re experiencing problems, first try replacing the battery in your remote. You can typically find a replacement battery at any electronics store or online.
Another potential issue could be interference from other electronic devices or radio waves. If you are in proximity to devices that operate on similar frequencies, they may disrupt the keyless entry signal. To test this theory, try using your key fob in a different location, away from potential sources of interference.
How do I replace the battery in my Subaru key fob?
Replacing the battery in your Subaru key fob is a straightforward process. Start by finding a small slot or notch on the key fob casing. Use a coin or a flat-head screwdriver to gently pry the fob apart, being careful not to damage the internal components. Once opened, you will see the battery inside, which you can carefully remove.
After removing the old battery, install the new one with the positive side facing upwards, ensuring it fits snugly in place. Reattach the key fob casing by snapping it back together, and test the keyless entry functionality. If the system still does not work after the battery replacement, additional troubleshooting may be needed.
Is there a way to reset my keyless entry system?
Yes, you can reset your Subaru’s keyless entry system, and it’s often a relatively simple process. To reset, start by sitting inside your vehicle with all doors closed. Insert your key into the ignition and turn it from the “Off” position to the “On” position without starting the engine repeatedly. You typically need to do this several times, which may vary by model and year.
After performing the reset sequence, test the key fob to see if functionality has returned. If this does not resolve the issue, it might be necessary to consult your owner’s manual for model-specific reset instructions or seek the assistance of a professional.
Could my Subaru’s keyless entry module be malfunctioning?
Yes, a malfunctioning keyless entry module can indeed prevent your Subaru from recognizing the key fob’s signal. This module is the central component that receives the signal transmitted by your key fob. If the module is damaged or not functioning properly, it may not respond when you press the buttons on your key fob.
To determine if the module is the issue, you may need to have a diagnostic test performed by a qualified technician. They can scan your vehicle’s computer systems to identify any error codes related to the keyless entry system, which can help pinpoint the malfunction and guide necessary repairs.
What should I do if my key fob is physically damaged?
If your key fob is physically damaged, it might be preventing the keyless entry system from working. Look for any cracks, missing buttons, or other visible signs of damage. If the damage is severe, it is recommended to replace the fob altogether, as internal components may be compromised.
You can obtain a replacement key fob from your local Subaru dealership or an authorized locksmith. After getting a new fob, you will usually need to have it programmed to sync with your vehicle. This process can often be completed at the dealership or with capable automotive locksmith services.
Could my Subaru be experiencing a software issue?
Yes, your vehicle may be experiencing a software issue that is affecting the keyless entry system’s functionality. Like any electronic system, the software that controls various components in your Subaru can sometimes become unresponsive or need updates. This issue might be evident if there are multiple electronic systems within the vehicle that are malfunctioning.
In this case, the best course of action is to take your car to a Subaru dealership or a qualified automotive technician. They can connect the vehicle to diagnostic equipment to check for any software-related issues and apply updates or adjustments as needed to restore proper functionality to the keyless entry system.
Can weather conditions impact the keyless entry functionality?
Yes, weather conditions can impact the performance of your Subaru’s keyless entry system. Extreme temperatures—both hot and cold—can affect battery performance in the key fob, potentially leading to weaker signals. Additionally, heavy rain or snow can cause interference or block signals due to moisture interfering with electrical connections.
If you suspect weather conditions are the culprit, try using the key fob in different environmental conditions to gauge its performance. If it works better in milder weather but fails during extremes, consider keeping a spare key on hand just in case, and replacing the fob battery regularly to ensure optimal performance regardless of the weather.
What should I do if none of these solutions work?
If you have tried all the troubleshooting steps and your Subaru keyless entry system is still not working, it may be time to seek professional help. A certified Subaru technician can perform a comprehensive diagnostic to identify the root of the issue, using specialized tools that can reveal underlying problems not visible through standard checks.
You might also consider reaching out to Subaru customer service or checking online forums for additional support from other Subaru owners who may have experienced similar issues. If it turns out to be a more significant problem requiring repairs or parts replacement, the dealership or a qualified mechanic can guide you through the necessary steps.