Q: Brake lights not working in a 2002 Chevrolet Trailblazer

asked by on

The brake lights on my SUV aren't working, but the one in the middle does. All the other lights are working fine. I checked fuse 12 and 34, and those are fine. The bulbs are still good. I did some research, and there is a brake switch located on the brake pedal. Is that linked to the brake lights directly? Is it possible for the switch to go bad? Anything else that might cause my main brake lights not to work?

A: Looking at the wiring diagram for your vehi...

Looking at the wiring diagram for your vehicle, I see that all the brake lights share a common ground. They also all utilize the brake lamp switch, so both of these items can be ruled out. The only thing the third brake light does not share with the other brake lights is the #16 vehicle CHMSL fuse. Since you said the third brake light bulb is good, I would check this fuse. If there isn't a problem with the fuse, then there is a problem with the third brake light wiring. Electrical diagnosis can be difficult, so I suggest you have a trained professional inspect your vehicle's brake light problem firsthand.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Headlights turn on and ac but dont start up.

If the starter is not operating at all, you have an electrical problem. A certified technician, like one from YourMechanic, would first check to see if power is getting to the starter motor and if the ground is good (e.g.,...

Q: What does the brake system Warning Light mean in a 2012 Ford Explorer?

The brake system Warning Light is located on the instrument panel. This light illuminates when the parking brake is engaged, when there is a problem with the brake system, or when the brake fluid is low. As soon as you...

Q: What does the high beams light mean?

The High Beam Lights on your dashboard will indicate the performance of your high beam headlights. It will tell you if they are on or off. To understand the High Beam Lights. Locate the High Beam Lights on your...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.