Brake lights/turn signals in the rear not working?

Tiny
JKUNZ22
  • MEMBER
  • 2012 LINCOLN MKX
  • 6 CYL
  • 2WD
  • 200,000 MILES
In my 2012 Lincoln mkx I’m currently experiencing issues with the brake lights/turn signals in the rear not working. Also the interior touch screen/climate control panel is dead. Also the rain sensor I believe because wipers are off but continue to operate. Everything else works great! Vehicle is in amazing shape so hate to get rid of it but I’m stumped. Changed fuzes and checked battery. Did research and thought it was turn signal switch until the interior controls went. Baffled please help!
Friday, March 6th, 2026 AT 5:41 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,481 POSTS
Did these three problem all show up at once? So these are controlled by the BCM so there are fuses on the BCM as well we need to check, here is a video to help and the fuse locations below.

https://www.youtube.com/watch?v=G-xNK79Wa-w

if the fuses are okay I would run CAN scan to check the BCM

CAN SCAN - https://youtu.be/u-4syLc-ifQ

Check out the images (below). Please let us know what happens. Ken

Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Saturday, March 7th, 2026 AT 12:37 PM
Tiny
JKUNZ22
  • MEMBER
  • 3 POSTS
They did all happen pretty much at once. Within 24 hours for the most part other than the brake lights.
Was this
answer
helpful?
Yes
No
Sunday, March 8th, 2026 AT 5:21 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,481 POSTS
Yep, chances are the BCM is bad, I would check the electrical connector for corrosion which I have seen before especially after a wet winter. Disconnect the battery first and remove the electrical connectors. The BCM is up under the ash on the driver side. Also, did you get the chance to do the CAN scan? Check out the images (below). Please let us know what happens.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Monday, March 9th, 2026 AT 7:23 AM

Please login or register to post a reply.

Related Turn Signal Not Working Content

Turn Signal Problems
GUIDE
Turn Signal Problems
Turn signals are intended to help inform surrounding drivers of the vehicle's intended change in direction. Although there are a few different causes for signal failure...