Troubleshooting Subaru Key Fob Issues After Battery Replacement

Understanding Why Your Subaru Key Fob Might Not Work After a Battery Change

If your Subaru key fob has stopped functioning even after you’ve replaced the battery, you may be facing one of several potential issues. Here are some common reasons why this problem occurs:

• Loose Buttons
• Damaged Locks
• Programming Issues
• Defective Keys
• Broken Battery Connector Terminal
• Electrical Problems

Each of these issues can lead to your Subaru key fob not working after a battery replacement, but fortunately, there are specific solutions to address them. Let’s delve into each problem and explore how to fix it.

Key Takeaways

• Possible causes include loose buttons, damaged locks, programming issues, defective keys, a broken battery connector terminal, and electrical problems.
• There are actionable solutions for when the Subaru key fob does not function after a battery change.
• A detailed, step-by-step guide is available for troubleshooting key programming sequences.

Subaru Key Fob Not Working After Battery Change: Issues and Solutions

Issues	Symptoms	Quick Fixes
Loose Button	Buttons are unresponsive or only work intermittently.	Open the key fob to check for loose buttons or connections. Tighten any loose parts or replace them if necessary.
Broken Battery Connector Terminal	Key fob fails to work after battery replacement.	Inspect the battery connector terminal. Replace it if it shows signs of damage.
Damaged Locks	Key fob cannot lock or unlock the doors.	Examine the door locks and the key fob itself. Repair or replace any damaged components.
Programming Issues	Key fob is unresponsive after battery change or requires reprogramming.	Reprogram the key fob following the owner’s manual instructions or visit a dealership for professional assistance.
Faulty Key	Key fob is completely unresponsive.	Replace the key fob. Consult a dealership for repairs.
Electrical Problems	Key fob is entirely non-functional or works sporadically.	Inspect the vehicle’s electrical system and the key fob. Repair or replace any defective components.

Reason 1: Loose Button

If your Subaru key fob isn’t functioning after a battery replacement, a loose button might be the culprit. Here’s how to address this issue:

Solution:

• Remove the key from the fob.
• Check for any loose or damaged components within the key fob. Repair or replace them as necessary.
• Reinsert the key and ensure it is securely in place.
• Test the key fob again. If it remains unresponsive, you may need to reprogram it.

Reason 2: Broken Battery Connector Terminal

A broken battery connector terminal can prevent your key fob from working properly. Here’s how to check and address this issue:

Solution:

1. Remove the key fob from your vehicle and locate the battery connector terminal, usually a small metal tab on the fob’s back.
2. Utilize a flashlight to inspect the terminal.
3. Look for cracks, corrosion, or any signs of damage.
4. If you find any damage, you will need to replace the terminal.

A qualified mechanic or dealership can assist with this replacement. If you are experiencing Bluetooth pairing issues along with the key fob malfunction, you may also need to reset your car’s battery, which could require reprogramming the key fob.

Reason 3: Damaged Locks

Should your Subaru key fob stop working after a battery change, damaged locks might be the reason. The locks need to be in good condition to receive signals from the key fob. Here are some potential damages:

• Broken Tumblers: These small, spring-loaded pins must align correctly for the lock to function. If they are damaged, the lock won’t open.
• Worn or Damaged Actuator: This component moves the tumblers. Any wear or damage can prevent it from functioning correctly.
• Rust or Corrosion: Accumulation on the lock components can hinder movement and create issues.
• Damaged Housing: A compromised outer shell can affect the lock’s security and signal transmission.

Solution:

Consult a qualified mechanic or dealership to repair the locks. Once repaired, your key fob should be able to lock and unlock your car.

Reason 4: Programming Issues

If the connection between your key fob and vehicle is disrupted, reprogramming may be required. This is especially true after battery replacement.

Solution:

To reprogram your Subaru key fob, you will need:

• The old key fob.
• A new key fob.
• Your car’s owner’s manual.

Follow these steps to reprogram:

1. Turn on your vehicle’s ignition.
2. Press the lock button on the old key fob for five seconds until the car acknowledges the command with a light flash.
3. Release the lock button and press the unlock button.
4. The car’s lights should flash twice.
5. Repeat the process with the new key fob.

Your newly programmed key fob should now function correctly.

Reason 5: Faulty Keys

If your key fob is faulty, it may not work even with a new battery. In such cases, obtaining a new key fob is necessary.

Solution:

Seek assistance from a qualified mechanic or dealership to diagnose and replace the faulty key fob.

Reason 7: Electrical Problems

If there are issues with the electrical components of your key fob, it will need replacement, as the connection with the circuit board may be compromised.

Solution:

Check the car’s electrical system for potential issues:

1. Inspect the wiring that connects the key fob to the vehicle for any cracks or damage.
2. Test the voltage at the wiring harness connector. The key fob battery should measure between 12 and 14 volts with a voltmeter or multimeter.

Product	Features
Voltmeter or Multimeter Tester	Compact and user-friendly design.

If the voltage is insufficient, this indicates an electrical issue:

1. Check the fuse using a tester. Replace any blown fuses with new ones of the same amperage.
2. If problems persist, consult a qualified mechanic for further diagnosis.

Note that blown fuses can also affect other components, such as the radio controls located on the steering wheel. Inspect the key fob for any signs of damage, such as:

• Cracks or corrosion.
• Low battery voltage (should be between 3 and 3.6 volts).
• Consult a mechanic if issues continue after these checks.

Troubleshooting Subaru Key Fob Problems: A Step-by-step Guide

To ensure your key fob functions correctly, it must be programmed to your vehicle, as each fob has a unique signal recognized by the car’s electrical system. If the connection is lost, reprogramming is necessary.

1. Install the new battery correctly, ensuring the negative (-) side faces down.
2. Press the key fob buttons. If they don’t respond, the battery may be dead or improperly inserted.
3. If the buttons work but the locking/unlocking function fails, reprogram the key fob.

To reprogram your key fob, follow these instructions:

1. Close the car door and sit inside.
2. Insert the key into the ignition.
3. Turn the key to the “ON” position without starting the vehicle.
4. Return the key to the “OFF” position within 10 seconds.
5. Repeat the process for a total of three to four cycles.
6. After the fifth turn to “OFF,” leave it in that position.
7. Press and hold the lock button on the key fob for five seconds.
8. The car’s lights should flash, indicating successful reprogramming.
9. If the lights do not flash, repeat the steps.

If issues persist, consider visiting your Subaru dealer for assistance.

Frequently Asked Questions (FAQs)

How To Reset The Subaru Key Fob After Replacing The Battery?

To reset the key fob, place the new battery inside, then press the lock button for about 10 seconds until you hear a chime, confirming that the key fob has been reset and is functioning correctly.

Why Is My Subaru Key Not Turning?

Your Subaru key may not turn due to a dead key battery or improper key insertion. If replacing the battery does not resolve the issue, you may need to replace the ignition switch.

Can I Start My Car if I Lose My Key Fob?

Yes, depending on the model, you might be able to start your car without the key fob. Some vehicles have a backup key slot in the dashboard or center console, where you can insert a backup key to start the car. Others may feature a push-button start system that allows you to use a special slot for the key.

Bottom Line

In summary, various factors can lead to your Subaru key fob not functioning properly after a battery change. These range from loose buttons and damaged locks to programming difficulties and faulty keys. By identifying the specific issue and implementing the appropriate solutions, you can ensure that your key fob operates effectively.