Interior lights issue?

2012 LINCOLN NAVIGATOR

180,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC

JVILLEGAS0919

MEMBER
3 POSTS

My interior lights will only come on when either of the doors open. But if we try to turn the light individually it will not turn on. Also, when either door is opened and we click on any light, the light immediately turns off.

Dec 22, 2022 at 8:38 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

This happens when the SJB (smart junction box) goes out, but to be sure we should do a CAN scan which is easy. You can get a CAN scanner (Controller Area Network) from Amazon from about $32.00.

Here is a video to show you how:

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

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Amazon CAN scanner link:

https://amzn.to/3sX8MCX

Here are the interior wiring diagrams so you can see how the system works and how to change out the SJB as well. 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.

Dec 23, 2022 at 11:57 AM

JVILLEGAS0919

MEMBER
3 POSTS

Thank you so much. I have a scanner at home that connects to my laptop. I’ll look at the video and check it out. I’ll follow up. Thank you again and Happy Holidays.

Dec 23, 2022 at 1:43 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

You are welcome and happy holidays to you as well. Let me know what you find so we can get the problem solved for you.

Dec 24, 2022 at 11:38 AM