Q: Brake lights on trunk not working

asked by on

The brake lights on my trunk aren't working. This is after replacing all the bulbs and fuses (even though the tester said they were fine.) the brake light in the rear window works, and the tail lights work. Blinkers, reverse lights, headlights, high beams - everything works except the trunk brake lights. The only other thing not working is my cruise control. Might that be related? If not, what would cause the brake lights to stop working just on my trunk?

For some reason, when consulting the wiring diagram, I don’t see a trunk mounted brake light listed. I only see the high mount (one in the rear window) listed. Regardless, if the trunk bulb is not working with a new bulb, there is a problem with the circuit. Check for both power and ground at the bulb. Once you’ve determined which is lacking, you’ll have to trace the circuit to determine where the problem lies. Since you said all of the other brake lights work, the cruise control is likely unrelated. Electrical diagnosis can be difficult, so I suggest you have a trained professional tackle the problem with your brake lights for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Brake lights on trunk not working

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: 2007 Audi A3 daytime running lights do not work

There is a technical service bulletin (TSB) for this issue that states the daytime running lamp thumb wheel may get switched off by mistake. Check to make sure the thumb wheel is in the corrector position. It is located next...

Q: Car noise, dashboard warnings on

One guess is that the problem could be a faulty wheel bearing(s). Bad wheel bearings often result in a rotational growling noise. The wheel bearing is integral to the hub assembly on your vehicle, which also houses the reluctor ring...

Q: Every now and then my steering gets hard to steer mostly when it's cold just for a second or so then right back to normal

If you have power steering, a possible cause of this is a momentary loss of pressure in the system due to the pump slowing dramatically under load. That circumstance will be worsened if the fluid is cold. The slowing of...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...