How To Solve Subaru Outback Brake Light Issue - Make Your Bulbs Shine Again

By Nick Marchenko, PhD

When it comes to maintaining your Subaru Outback, addressing brake light failure is crucial not only for your safety but also to avoid any unnecessary encounters with law enforcement. This guide will combine insights from various discussions to provide you with a comprehensive DIY solution for fixing brake light issues on your Subaru Outback.

Understanding the Problem

Brake light failure in the Subaru Outback can stem from various issues, ranging from simple blown bulbs to more complex electrical faults. It's essential to approach this problem methodically, starting with the most straightforward solutions and gradually moving to more complex diagnostics.

Step 1: Check Bulbs and Fuses

Before diving into more intricate electrical troubleshooting, confirm that the issue isn't due to something as simple as blown bulbs or fuses. Despite appearing intact, bulbs and fuses can still be faulty. Test them electrically with a continuity meter to ensure they're functioning correctly.

For a detailed guide on choosing and replacing bulbs, check our Subaru Outback bulb size chart:

• 2012;
• 2011;
• 2010;
• 2009;
• 2008;
• 2007;
• 2006;
• 2005;
• 2004;
• 2003;
• 2002;
• 2001;
• 2000;

Step 2: Inspect the Wiring Harness

Corrosion within the wiring harness, especially where the rear hatch meets the roof, can lead to brake light failure. Inspect this area for any signs of wear or corrosion. If you discover damage, cleaning or replacing the affected section might resolve the issue. For more on maintaining your vehicle's electrical system, see our guide on upgrading the sound system of Subaru Outback.

Step 3: Check for Wiring Issues

Brake lights are wired through different circuits, making simultaneous failure less likely due to a single cause. However, wiring leading to the hatch can develop breaks or short to ground, affecting brake light functionality. Specifically, the third brake light, which uses LEDs, might still function even if there's a break affecting the incandescent bulbs of the outer fender brake lights. Verify the integrity of these wires and replace or repair as necessary. Our post on fixing scratches on Subaru Outback offers additional tips on dealing with vehicle repairs.

Step 4: Electrical Testing

If the above steps don't resolve the issue, it's time for more thorough electrical testing. Using a multimeter, check for power and ground at the brake light socket. Additionally, ensure the brake light switch, usually located near the brake pedal, is functioning correctly. This step might require a wiring diagram and a bit more technical knowledge. For insights into handling electrical components, consider our article on choosing the best light bulbs for Subaru Outback.

Shop From Amazon

WeePro Vpro850L Digital Multimeter DC AC Voltmeter, Ohm Volt Amp Test Meter, Electric Test...

Klein Tools 69149P Electrical Test Kit with Digital Multimeter, Noncontact Voltage Tester...

AstroAI Multimeter 2000 Counts Digital Multimeter with DC AC Voltmeter and Ohm Volt Amp Te...

Conclusion

Addressing brake light failure in your Subaru Outback can range from simple bulb replacements to more involved electrical troubleshooting. By following these steps, you can ensure your brake lights are in working order, keeping you safe and compliant on the road. For more tips on maintaining your Subaru Outback, check out our comprehensive guide on preparing your Subaru Outback for towing.

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.

Full profile → LinkedIn →