Buick Envision Brake Lights Not Working - How To Diagnose And Fix

By Nick Marchenko, PhD

Ever had that moment when you're cruising down the road, and you realize something's amiss with your car? It's a sinking feeling, especially when it involves something as crucial as the brake lights. Well, fret not, fellow Buick Envision aficionados, because today, I'm going to guide you through the ins and outs of diagnosing and fixing a common ailment: brake light failure. So, grab your toolbox, and let's dive in!

Step 1: Initial Diagnosis

Imagine driving your Buick Envision, and you find out the two main brake lights are throwing a tantrum – they decide to work only when they feel like it. However, the third brake light, perched like a crown jewel in the back window, is glowing steadfastly. An oddity, isn't it? This is our patient's symptom: intermittent failure of the left and right brake lights, with the third light unfazed.

Step 2: Checking the Basics

The first port of call is the brake light bulbs. A quick check with a Power Pro (or any reliable multimeter) might tell you if the bulbs are the culprits. However, in our case, the bulbs were innocent, basking in the glow of their own integrity. The real mischief lay elsewhere – a classic case of "power, but not where you need it."

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• 2020;
• 2019;
• 2018;
• 2017;
• 2016;

Step 3: The Hunt for Power

The brake light switch, a humble on-off device, gets its moment in the spotlight. Applying the brake pedal should complete a circuit, sending power to the brake lights. A test reveals power entering the switch and leaving when the pedal is depressed. Yet, the power seems to vanish into thin air before it reaches the brake lights. A puzzling conundrum!

Step 4: The Wiring Diagram

Armed with a wiring diagram, we embark on a treasure hunt through the vehicle's electrical pathways. The journey is intricate, leading us through the heart of the dashboard, into the turn signal switch, and finally, making its way up the steering column. The diagram is our map, guiding us through the electrical labyrinth within our trusty Buick Envision.

Step 5: Disassembly and Discovery

Next, we delve into the depths of the steering column, a realm where airbags fear to tread. With precision and patience, we navigate our way through, disconnecting, unscrewing, and carefully bypassing the airbag to reach our quarry – the turn signal switch.

Step 6: The Replacement

Out with the old, in with the new. The faulty turn signal switch is replaced with a shiny new one. This task requires a delicate balance of dexterity and caution, as we thread the new switch into place, ensuring every connector, every screw, finds its preordained home.

Step 7: Reassembly

The steering column, now devoid of its defect, is reassembled with the care of a surgeon closing a wound. Each component is returned to its rightful place, each screw tightened with just the right amount of zeal.

Closing Thoughts

And there you have it, folks, a journey from darkness back to light. The Buick Envision, once beleaguered by fickle brake lights, now stands ready to face the roads anew. Remember, the path to automotive enlightenment is paved with patience, perseverance, and a good wiring diagram. Safe travels, and until next time, keep those wrenches turning!

See Also:

• Here Are The 3 Buick Envision Years to Avoid
• Cars Like Buick Envision? 14 Similar Vehicles Worth Checking Out
• What Engines Can You Put in Buick Envision?

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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