Headlights stay on even during the day when the car is set to automatic

Tiny
JVILLEGAS1991
  • MEMBER
  • 2013 CADILLAC ATS
  • 2.0L
  • 4 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 63,000 MILES
If I turn them off manually they turn off, but if I leave it in automatic they remain on at all times. I recently upgraded my bulbs from halogen to LED. At first I thought that was the issue but that would not be the issue as the car is the one that controls when power is diverted to the headlights. My next guess was that the ambient light sensor went out. Which I already replaced and that did not fix the issue either. I don't know what else it could be.
Sunday, November 24th, 2019 AT 2:57 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,634 POSTS
Hello,

It sounds like the headlight relay can be stuck on. You have one for low beam and one for high beam. Here is a guide to help you test the relay and the location of the relay in the diagrams below. I have also included the headlight wiring diagrams so you can see how the system works.

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

You can remove the relay to see if the lights go out as well. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Tuesday, November 26th, 2019 AT 1:53 PM

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