Skip the auto shop - Our mechanics make house calls

Q: Brake switch confirmed good, but brake lights not working

asked by on

My van’s brake lights do not work; however, the turn signals, hazards, and lights do work. I removed the brake switch and confirmed that it is good and performing well. It has 2 n/c contacts and 1 n/o contact. Even though the 2 are opening and the 1 is closing, the brake lights till are not working. I am wondering if the brake light circuit goes through the ehcu. Do you think I should start considering that ehcu as the problem or is it something else?

The brake lights are turned on and off by the brake light relay in the underhood relay box. This relay is controlled by the body control module and is signaled by the brake switch. Check the relay first to see if the body control module is operating the relay and then scan the body control module to see if it is getting a brake signal from the brake switch and sending out a signal to the relay. You may want to disconnect the battery and disconnect the body control module connectors and apply dielectric lube to the pins and reconnect it for a loose or corroded connection. If you want to have this checked, a certified pro from YourMechanic can come to your car’s location to inspect the brake light and let you know what needs repair.

Was this answer helpful?

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

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Remove a wired tracking device

These trackers are typically what they call "plug-and-play" type devices and can usually just be unplugged if you know where it's located. Depending on how it is connected, it should be simple to remove. If you are unsure about how...

Q: Brake sinks slowly while at stop

The most common cause for the brake pedal to sink slowly to the floor will be the brake master cylinder internal pressure cup failure. The seals may be worn or sludged up from old dirty brake fluid. I have...

Q: I have a 98 Honda Accord that is stuck in park and I cannot shift from park to drive. I tried to apply the pedal brake but nothing works.

Hi there. Check the neutral safety switch on the brake pedal and see if there is any voltage coming to and out of the switch when the contacts are closed (switch operated). If there is no power out of the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.