Tail lights not working, but brake lights do and side running lights work.

DALEBLAKE

MEMBER
2012 CADILLAC ESCALADE

So, my LED lights on both left and right as well as the top rear light don't work as running lights suddenly. Lights are not burnt out as when I press on brake, all lights light up as brake lights. They are just not running on their normal dim running light. All other parking lights work, on back and front. Just the two rows that function as both break and running lights. I only find a parking light fuse in the motor fuse box. Nothing in the cabin fuse box that would relate to running lights.

5 Replies

HMAC300

MECHANIC
48,601 POSTS

It sounds like you have a tail light relay that is not working here is a guide to help you check it.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Here are the tail light wiring diagrams so you can see how the system works and relay location

Check out the diagrams (Below)

Please let us know what you find.

Cheers

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Saturday, December 13th, 2014 AT 11:24 AM

DALEBLAKE

MEMBER
2 POSTS

Thanks, all fuses are good. Then I checked the relay and it was out. I got a new one for $23.00 and installed it everything works great again thanks I love this site.

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Saturday, December 13th, 2014 AT 12:34 PM

XYZDTN2011

MEMBER
1 POST
2000 CADILLAC ESCALADE
60,000 MILES

Hi, The two side brake lights on my 2000 escalade are not working, the top third LED brake light is working. The brake lamp relay on the switch box is missing, but I can not find a part for it on the web, so maybe not used at all.

The hazard lights are also not working, and I noticed that the hazard light fuse in the switch box is missing. Also if the hazard switch on the steering column is depressed (turned on), then the turn signal lights work. If hazard switch is not depressed, then turn signal light on working (no sound, no blinking).

I don't know if this is the way it should be, or the wiring have been rewired by the previous owner or service.

Can you help?
Thanks ahead for your help,
Young

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Friday, May 15th, 2020 AT 12:08 PM (Merged)

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Without being there, I can't be 100% sure what is going on. However, it sounds like someone has changed some things. You should have a fuse for the signals and a relay for the brake lights.

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Friday, May 15th, 2020 AT 12:08 PM (Merged)