Chevrolet Equinox Brake Light Fail - How To Diagnose And Fix

By Nick Marchenko, PhD

Dealing with a Chevrolet Equinox with brake light failure can be a perplexing and frustrating experience. However, with the right approach and some patience, most problems can be diagnosed and resolved. This guide compiles insights from various experiences and discussions to provide a comprehensive DIY approach to fixing brake light issues in the Chevrolet Equinox.

Step 1: Preliminary Checks

• Brake Light Switch: A faulty brake light switch could be the culprit. This switch is typically located near the brake pedal. Ensure it is functioning correctly and isn’t disconnected or damaged.
• Bulbs and Fuses: Initially, ensure that the brake light bulbs and fuses are in good working condition.

If you're not sure which bulbs will fit your Chevrolet Equinox, check out our bulb size chart:

• 2017;
• 2016;
• 2015;
• 2014;
• 2013;
• 2012;
• 2011;
• 2010;
• 2009;

Step 2: Circuit Board and Wiring

• Circuit Boards: In some Chevrolet models, the circuit boards where the bulbs plug into are known to fail. However, for the Equinox, this is less common.
• Wiring Issues: Check for any loose connections or damaged wires, especially if you have a trailer wiring harness connected. A bad wire or a poor connection could be interrupting the brake light circuit.

Step 3: The Underhood Fuse Block

• Stop Lamp PCB Relay: The Equinox's brake lights may fail due to a problematic Stop Lamp PCB Relay, which is part of the underhood fuse block. Unfortunately, if this relay is defective, the entire fuse block might need replacement.
• Fuse Block Replacement: If you ascertain that the fuse block is the issue, replacing it can be a relatively straightforward DIY task. Instructions and diagrams specific to your Equinox model can usually be found in the vehicle manual or online forums.

Step 4: Additional Checks

• Brake Pedal Position Sensor: This sensor can fail, leading to brake light issues. Testing and replacing it may require some technical know-how and possibly a visit to a shop for BCM recalibration.
• BCM (Body Control Module): In some cases, issues with the BCM can lead to brake light failures. While bypassing the BCM (as done by some owners) can temporarily resolve the issue, it may lead to other complications and is not generally recommended.

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Step 5: Professional Assistance

If the problem persists after all these checks and fixes, it might be wise to seek professional help. A certified mechanic can provide a more in-depth diagnosis and repair.

Conclusion

Fixing brake light issues on a Chevrolet Equinox requires a methodical approach, starting from the simplest solutions like checking bulbs and fuses to more complex ones like inspecting the underhood fuse block and BCM. Always ensure your vehicle is safe to drive and compliant with road safety regulations. Remember, safety should be your priority.

See Also:

• How To Choose the Best Light Bulbs For Chevrolet Equinox?
• How To Upgrade Sound System of Chevrolet Equinox
• What Does p0420 Code Chevrolet Equinox Mean?

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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