Chevrolet Blazer Brake Light Fail - Causes And Solutions

By Nick Marchenko, PhD

Having trouble with your Chevrolet Blazer's brake lights? Don't worry, you're not alone. The good news is that with a few tools and a bit of patience, you can troubleshoot and fix the problem yourself. Follow this guide to get your brake lights shining brightly again.

Preliminary Checks

Before diving into more intricate repairs, let's cover the basics:

• Check the Bulbs: Even if you've already done this, it's worth another look. Ensure they're the correct type and are seated properly in the socket.
• Inspect the Fuses: Locate the fuse box and check the fuses related to the brake lights and turn signals.

Looking for a replacement bulbs for your Chevrolet Blazer? Check our bulb size chart to ensure that you are choosing the right product. Not only brake light bulbs can be found there - all bulb sizes on every position are described in our bulb size chart:

• 2022;
• 2021;
• 2020;
• 2019;
• 2005;
• 2004;
• 2003;
• 2002;
• 2001;
• 2000;
• 1999;

Common Culprits and Fixes

1. Brake Light Switch: This little switch plays a big role in brake light functionality.
   • Location: You'll find it under the dash; follow the brake pedal up to spot the switch.
   • Symptoms of Failure: Brake lights stay off regardless of pedal position.
   • Replacement: The switch is typically self-adjusting and easy to replace once the lower trim panel is removed.
2. Multifunction Switch: Controls not just turn signals and brights, but also brake lights.
   • Symptoms of Failure: Erratic brake light behavior; sometimes working with hazard lights or turn signal activation.
   • Recall: Some models have had a recall on this part, so check with your dealer.
   • DIY Replacement: Can be complex; involves steering column components. Proceed with caution and reference your service manual.

Step-by-Step Guide

Replacing the Brake Light Switch

1. Disconnect the Battery: Safety first! Always disconnect the battery before working on electrical components.
2. Remove Trim: Take off the lower trim panel under the steering wheel to access the switch.
3. Locate and Replace: Find the switch near the top of the brake pedal. Disconnect the wiring harness and remove the old switch. Install the new one, ensuring it's adjusted properly so that it activates with the brake pedal movement.

Addressing the Multifunction Switch

1. Steering Column Access: Carefully remove the necessary covers from the steering column.
2. Removal and Replacement: Disconnect the old switch, being mindful of wiring and connectors. Fit the new switch and reassemble.
3. Testing: Before wrapping up, test all related functions – brake lights, turn signals, hazards, and cruise control (if applicable).

See Also:

For additional context on the parts we're discussing, check out our previous posts:

• All About the 4L60E Transmission
• DIY Tips for 4L60E Transmission Work
• Technical Specifications and Physical Aspects of 4L60E Transmission

Additional Tips

• Remote Starter Installations: These can affect brake light wiring. Inspect for any loose or improperly connected wires if such a system is installed.
• Recalls: Always check for recalls, as certain years and models have had issues with components relevant to brake lights.

Final Thoughts

Repairing your Chevrolet Blazer's brake lights can be a straightforward task with the right guidance. Remember, take your time, follow the steps carefully, and don't hesitate to seek professional help if needed. Stay safe and happy motoring!

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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