The taillights are not working, can I get the taillights wiring diagram?

2001 CADILLAC DEVILLE

150,000 MILES • V8 • 2WD • AUTOMATIC

DOLLABILL25

MEMBER
46 POSTS

I've already checked all my fuses and bulbs, they're all good. I just don't have no taillights when I turn on my switch. I checked the switch with multimeter it's good. so, I was just wondering if you could help me with the taillight wiring diagram. maybe it's a wire problem? Thank you

Feb 6, 2024 at 8:15 AM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

So, there is a taillight relay I would swap out or test which this guide can help with:

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

Also, there is a turn/hazard module that can do out and cause this problem as well. Here is the location of the flasher module and relay (rear fuse panel) so you can check it out and I have included the taillight wiring diagrams as requested. Remove the left knee bolster, turn/hazard flasher module (1). Check out the images (below). Please let us know what happens.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Feb 6, 2024 at 1:09 PM

DOLLABILL25

MEMBER
46 POSTS

No thank you, that's what I needed. Thank you again.

Feb 6, 2024 at 2:51 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

You are welcome, please let us know what you find to fix the problem.

Feb 8, 2024 at 9:10 AM