Hid headlights not working?

2011 LINCOLN MKX

4WD • AUTOMATIC

BOBNY41

MEMBER
1 POST

Passenger side headlight stopped working and replaced the ballast and the bulb it worked for a short trip about 30 miles and quit appears to be no power to the plug at all. Also adaptive headlight check adaptive headlights more light came on now the code reader says it's lost communication to the A headlight fuses. All look good. What else can I check?

Jul 22, 2026 at 8:09 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

This can be a bad BCM, but there are 7 fuses that run the system so we need to check all of them, here are the fuses and there location in the image below. I also included the wiring diagrams so you can see how the system works. To see if the BCM is bad lets do a CAN scan, this video can show you how.

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

Check out the images (below). Let me know how it goes

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Jul 23, 2026 at 2:13 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

Here is the location of the BCM which is under the dash on the drivers side. in case you need to change it out. Also, I would try removing the electrical connector at the BCM to see if there are corroded or melted. Disconnect the battery first.

Image (Click to enlarge)

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

Jul 23, 2026 at 2:16 PM

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.