Brake lights and rear turn signals not working

2012 BUICK ENCLAVE
70,000 MILES
Avatar
JUSTIN MITCHELL
  • MEMBER
  • 1 POST
Rear hazards not working. Tail lights come on, but that's it. Third brake light working fine.
Jul 15, 2019 at 5:13 PM
Advertisement
Avatar
SCGRANTURISMO
  • ✓ASE Certified Mechanic
  • 4,897 POSTS
  • ASE Certified Mechanic
Hello,

This could be a problem with your vehicle's Body Control Module (BCM). In the diagrams down below I have included your vehicle's exterior lighting wiring diagram as well as the location and removal and installation of the BCM as well as reprogramming directions in the diagrams down below. Please go through these guides and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Jul 16, 2019 at 12:52 AM
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
I would start by checking he fuse on the BCM
Sep 6, 2025 at 5:21 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.