How to Fix Subaru Crosstrek Brake Light Fail: A Comprehensive DIY Guide

By Nick Marchenko, PhD

Maintaining the safety and functionality of your Subaru Crosstrek is paramount, especially when it comes to something as critical as the brake lights. A malfunction in these lights not only puts you at risk but also endangers others on the road. If you find yourself in a situation where your brake lights are not working correctly, this guide will help you diagnose and fix the problem, channeling the consumer advocacy spirit of ensuring vehicles are safe and reliable for all.

Understanding the Problem

Before diving into solutions, it's essential to understand the common issues that might affect the brake lights of your Subaru Crosstrek. The symptoms typically manifest in one of these scenarios:

• Side brake lights do not illuminate, although the center (3rd brake light) works.
• After replacing the original bulbs with LEDs, brake lights fail to work despite the top light functioning.
• Tail lights do not turn on, but brake lights do.

Troubleshooting Steps

Step 1: Inspect the Bulbs

• Check the Condition of the Bulbs: Dual filament bulbs are used in the Subaru Crosstrek, where one filament operates as a running light and the other lights up when the brakes are applied. The brake light filament can burn out more frequently.
• Replacement Guide: Removing and replacing the bulbs is straightforward. Access to the rear light fixture is usually gained by removing two screws under the hatch and pulling out the assembly. Reference your user manual or a Subaru model video tutorial for detailed steps.

Before making an installation, ensure that you are using the proper bulb sizes for your Subaru Crosstrek. To find the proper bulbs - consult the chart below:

• 2022;
• 2021;
• 2020;
• 2019;
• 2018;
• 2017;
• 2016;

Step 2: Addressing LED Specific Issues

If you've upgraded to LED bulbs and are facing issues, consider these points:

• Polarity Sensitivity: LED bulbs are polarized, meaning they may not work if inserted incorrectly. If the LEDs don't light up, try flipping them 180 degrees.
• Switch Back to Halogen Bulbs: Users who have switched to LED and encountered problems found that reverting to regular halogen bulbs resolved their brake light issues.

Step 3: Fuse and Relay Inspection

• Fuse Check: Identify and inspect the relevant fuses, which for many Subaru Crosstrek models are No. 8 for the tail lights and possibly another for the stop lights. Check both the cabin fuse box and any relevant fuses in the engine compartment.
• Brake Light Switch and Relay: If the third brake light works but the side ones don't, the issue is likely not the brake light switch. However, if you've ruled out bulbs and fuses, consider inspecting the brake light relay or switch, especially if there was a past recall on the component for your vehicle.

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Step 4: Ensure Correct Installation

- Correct Installation of Fuses and Bulbs: When checking or replacing fuses and bulbs, ensure they are installed correctly. An incorrect installation could lead to malfunctioning lights.

Step 5: When to Seek Professional Help

• Assessing Your Limits: If, after swapping out bulbs and checking fuses, the problem persists, it may be beyond a simple DIY fix. In such cases, consulting a professional or the dealership is advisable, especially to avoid risking safety.

Preventative Measures and Tips

• Regular Checks: Regularly inspect your brake lights to ensure they're functioning correctly. This can be a part of your routine vehicle maintenance checks.
• Recall Awareness: Stay informed about any recalls affecting your vehicle, especially those related to the electrical system or safety features like brake lights.

Conclusion

Repairing brake lights on your Subaru Crosstrek can often be a straightforward DIY project. By following these steps, you can ensure your vehicle remains safe and compliant with road safety regulations. Remember, while DIY repairs can be satisfying and cost-effective, never hesitate to seek professional advice when needed to ensure the job is done safely and correctly. Safe driving begins with a well-maintained vehicle.

See Also:

• Why Does the Subaru Crosstrek Hesitate to Accelerate?
• Choosing the Best Engine Oil for Your Subaru Crosstrek: A Guide to Nourishing It
• Why is Subaru Crosstrek Shaking at Highway Speeds & How to Fix It?

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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