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The drivers side headlight will come on at various times

Tiny
JON HUKILL
  • MEMBER
  • 2014 FORD F-150
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 62,000 MILES
Problem is intermittent, but the drivers side headlight will come on at various times, usually overnight and will drain the battery. Ford doesn't understand the issue, I have researched on line but the problem seems to be consistent with both headlamps, mine is only drivers side. Thought? I have hanged out lamp and ballast, cleaned the socket with electrical cleaner. Could the relay cause this issue with one side only?
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Tuesday, December 1st, 2020 AT 10:19 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,320 POSTS
Hi,

The only thing I see that can be causing it would be related to the auto light sensor in the body control module. When it turns on, do you know if it is high or low beam?

If you look at the attached pic, you'll see that the switch goes to the BCM and then it goes through the sensor (on automatic) or the sensor is bypassed and power sent to the lights. So, pay attention to which beam is turning on and try pulling the appropriate fuse to see if the light goes out. If it doesn't, then suspect a short to power in that wiring to the light. If it goes out, I have a feeling it is with the BCM. but to be sure lets do a CAN scan which is the future of automotive repair you can get a CAN scanner from Amazon for about $50.00 here is a video to show you how.

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

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (Below). Please let us know what happens.
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Tuesday, December 1st, 2020 AT 5:40 PM
Tiny
JON HUKILL
  • MEMBER
  • 4 POSTS
It is the low beam that comes on, I will work through your suggestion and see what I find. Thank you.
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Wednesday, December 2nd, 2020 AT 7:37 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,320 POSTS
You are welcome Jon. I will watch for your reply.

Take care,
Joe
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Wednesday, December 2nd, 2020 AT 5:35 PM
Tiny
JON HUKILL
  • MEMBER
  • 4 POSTS
Hi Joe. Okay, so I pulled the fuse #35 in the PDB which is the "High-intensity discharge headlamps †driver side" and the headlamp went out. Although now I see there are low-beam and high beam fuses inside the cab. I will look to pull them and see if I get the same result. Thoughts? Thanks so much. Jon
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Thursday, December 3rd, 2020 AT 4:31 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,320 POSTS
Yep, there are several. Try them and let me know the results. I'm just trying to determine if there is a short to power after the fuse.

Joe
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Thursday, December 3rd, 2020 AT 8:09 PM
Tiny
JON HUKILL
  • MEMBER
  • 4 POSTS
Hi Joe. Okay, pulled the low and high beam fuse in the cabin and headlamp still remained on with fuse pulled (low beam is on but pulled high beam just to be sure). It still goes off after I pull the fuse in the power distribution box in the engine compartment though. Thank you for helping me trouble shoot this. JH
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Saturday, December 5th, 2020 AT 5:29 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,320 POSTS
Okay, then we have a short to power after the low beam fuse. If I had to guess, it is going to deal with the shutter solenoid. I'm thinking through this and want you to confirm there is a ground to the solenoid. If that has failed, it may be back feeding power to the low beam. Please understand this is a theory at this point.

I attached a pic below and highlighted the wire and indicated the location. You are looking for a black wire with a green tracer

Let me know what you find.

Joe
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Saturday, December 5th, 2020 AT 9:30 PM

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