third brake light

2000 Cadillac Deville third brake light

Won't come On when brake is applied? Get back

no, reverse light wont work and plate light wont work, and trunk interior light wont come on and trunk release wont release.

no answer M. Rasmataz?

Sounds like you may have a bad fuse or possibly wiring issue. There is a fuse block under the rear seat int his car.

Read the guide below on using a test light, its the best way to test fuses

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester


The wiring diagrams for your lights are attached below

My tail lights, brake lights and turn signals are all out. I checked all of my bulbs and fuses but they all seem to be ok. How would I go about troubleshooting this problem? Could this be a BCM problem or maybe just a short somewhere. Would a diagnostic code reader tell me where the problem might be? I need help because I can't drive this car anywhere without getting pulled over. Any help would be greatly appreciated

You're going to need a test light to do some testing.

My first guess is a bad ground for the rear light harness.

the third brake light wont come on when press the brake

If rears work then suspect bulbs or wiring

I lost brake lights today and have check all fuses within the car system i.e, under hood and under rear passenger seat. I check the relay switch and all was ok. No blown fuses, signals from all relays (Ohlms reading) still no lights. I was able to remove the tail lamp but unable to reach the bulb. Not sure how to remove the protective layers. Still no brake lights, all other lights in car work..I would appreciate any help possible.

Sorry, I can not donate at this time.


Gary

check your brake on off switch, located on the pedal. check and replace as needed.

Thank you for answering questions on 2002 DHS brake light system.

G