Headlight wiring diagram

Tiny
DGRAVES
  • MEMBER
  • 2009 LINCOLN MKZ
  • 3.5L
  • V6
  • AUTOMATIC
  • 78 MILES
Low beam passenger headlight went out, replaced bulb and ballast and the fuses and relays are good. Why is the light still not working?
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Sunday, January 13th, 2019 AT 12:46 PM

9 Replies

Tiny
BMDOUBLE
  • EXPERT
One quick thing to try is to disconnect your battery for one minute and reconnect. The modules in these vehicles have protect circuits that will disable a particular circuit if there is an issue. A reset sometimes will restore operation so long as there is no more issues on said circuit.
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Sunday, January 13th, 2019 AT 4:00 PM
Tiny
KEN L
  • ADMIN
Hello,
I agree with BMDOUBLE the smart junction box could be having troubles, if resetting it doesn't work let's confirm the failure by testing the power at the fuses. Here is a guide to help and the fuse locations with the headlight wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the smart junction box is bad you can replace it because it self initializes. Check out the diagrams (below) check for power at fuses # f19, f2 and f24. Please let us know what you find. We are interested to see what it is.
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Sunday, January 13th, 2019 AT 5:33 PM
Tiny
PECCHE20
  • MEMBER
  • 2009 LINCOLN MKZ
  • 3.5L
  • V6
  • AWD
  • AUTOMATIC
  • 75,000 MILES
My driver side low beam went out. It is a hid system. I checked the fuses, replaced the hid bulb and it still does not work. I am assuming it is the ballast. How do I remove the head light assembly to get to this?
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Sunday, April 26th, 2020 AT 11:17 AM (Merged)
Tiny
MLDANIELS2000
  • MEMBER
Most likely bad ballast.

Removing headlight:
1. Remove the front bumper cover. For additional information, refer to BUMPERS.
2. Remove the headlamp assembly pin-type retainer.
3. Remove the 4 bolts and the headlamp assembly. Disconnect the electrical connectors.
4. To install, reverse the removal procedure

Removing bumper cover:
2. Remove the 6 pin-type retainers (3 each side).
3. Remove the 8 fender splash shield screws (4 each side).
4. Remove the 4 air deflector bolts.
5. If equipped, disconnect the fog lamp electrical connectors.
6. Remove the 5 bolts from the top of the radiator grille.
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Sunday, April 26th, 2020 AT 11:17 AM (Merged)
Tiny
CITATIONMAN
  • MEMBER
Thanks for the instructions; worked like a charm. I paid 55 bucks apiece online (I did both even though only one was out). Could not have been more straightforward. The dealer wanted 150 bucks each and estimated 3 hours. I saved 500 bucks with DIY
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Sunday, April 26th, 2020 AT 11:17 AM (Merged)
Tiny
OLIVE09
  • MEMBER
  • 2009 LINCOLN MKZ
  • AUTOMATIC
  • 156,000 MILES
I currently have HID headlights and I want to know how to convert it to halogen or can I do that?
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Sunday, April 26th, 2020 AT 11:17 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
That would be way more hassle that it would be worth. The car is wired for the HID modules and igniters.
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Sunday, April 26th, 2020 AT 11:17 AM (Merged)
Tiny
OLIVE09
  • MEMBER
I cannot find a headlight assembly because mine is cracked so I thought it would be easier to convert it. Where do you suggest I look for an assembly at besides Ford?
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Sunday, April 26th, 2020 AT 11:17 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
Ford is the best place to get the parts.
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Sunday, April 26th, 2020 AT 11:17 AM (Merged)

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