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Third brake light

Tiny
LISAPIERCE
  • MEMBER
  • 2000 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 110,000 MILES
How many fuses boxes on cadillac deville
Sunday, January 18th, 2009 AT 3:30 PM

11 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
2000 Cadillac Deville third brake light

Won't come On when brake is applied? Get back
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Sunday, January 18th, 2009 AT 3:32 PM
Tiny
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  • 4 POSTS
No, reverse light wont work and plate light wont work, and trunk interior light wont come on and trunk release wont release.
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Sunday, January 18th, 2009 AT 3:38 PM
Tiny
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No answer M. Rasmataz?
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Sunday, January 18th, 2009 AT 3:56 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
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Sunday, January 18th, 2009 AT 4:43 PM
Tiny
ALDOG2100A
  • MEMBER
  • 1 POST
  • 1991 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 98,000 MILES
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
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Monday, December 3rd, 2018 AT 5:46 PM (Merged)
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
You're going to need a test light to do some testing.

My first guess is a bad ground for the rear light harness.
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Monday, December 3rd, 2018 AT 5:46 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2000 CADILLAC DEVILLE
  • 13,800 MILES
The third brake light wont come on when press the brake
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Monday, December 3rd, 2018 AT 5:46 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
If rears work then suspect bulbs or wiring
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Monday, December 3rd, 2018 AT 5:46 PM (Merged)
Tiny
GARYSTEVEN
  • MEMBER
  • 2 POSTS
  • 2002 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 67,000 MILES
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
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Monday, December 3rd, 2018 AT 5:46 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Check your brake on off switch, located on the pedal. Check and replace as needed.
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Monday, December 3rd, 2018 AT 5:46 PM (Merged)
Tiny
GARYSTEVEN
  • MEMBER
  • 2 POSTS
Thank you for answering questions on 2002 DHS brake light system.

G
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Monday, December 3rd, 2018 AT 5:46 PM (Merged)

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