It says to take it to the dealer to replace the low beam headlight lamp in a 2003 lincoln aviator, is that necessary for can I do it should I change both so they match?

HEADLIGHTS NOT WORKING

It can be faulty headlight switch or issue with its wiring. Or its faulty head light fuse.

==========

To troubleshoot the issue i suggest you few help links with appropriate solution. So you can follow the test and confirm what exact problem is there in your case of headlights not working:-----

Click the link below: -----

All headlights not working?

http://repairhelpcenter.blogspot.com/2012/01/all-headlights-not-working.html

----------

• Working of Headlight switch?
------------
• Both headlight bulbs blow together?

------------
• Car headlight bulbs don't last long?

---------------

2007 Dodge Caliber: Low Beam Headlight Not working

http://technoanswers.blogspot.in/2012/06/2007-dodge-caliber-low-beam-headlight.html

----------

2003 Toyota Camry: Headlights Work Intermittently?

http://technoanswers.blogspot.in/2012/04/2003-toyota-camry-headlights-work.html

----------

Chevy Tahoe: Low Beam Lamps are not working?

http://technoanswers.blogspot.in/2012/04/chevy-tahoe-low-beam-lamps-are-not.html

----------

2001 Chevrolet Tahoe: Headlights not coming ON?

http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-headlights-not.html

--------

2004 Dodge Ram: High Beam Light is DIM?

http://technoanswers.blogspot.in/2012/04/2004-dodge-ram-high-beam-light-is-dim.html

----------

2001 Chevrolet Tahoe: Both Low Beam Lamps Not Working?

http://technoanswers.blogspot.in/2012/04/2001-chevrolet-tahoe-both-low-beam.html

------------

Low beam headlights Modification?

http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html

---------
How to Replace a Headlight

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight.html

------------
How to Replace a Headlight Bulb

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-bulb.html

-----------
How to Replace a Headlight Switch

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-headlight-switch.html

----------
How to Replace a Headlight Assembly

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-assembly.html

How to Replace a Park Light Assembly

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-park-light-assembly.html

-----------

Low beam headlights Modification?

http://schematicsdiagram.blogspot.in/2012/04/low-beam-headlights-modification.html

----------

Headlight Assembly Removal On Honda Accord

http://technoanswers.blogspot.in/2012/06/headlight-assembly-removal-on-honda.html

---------------

Honda Headlight Assembly Removal
http://schematicsdiagram.blogspot.in/2012/06/honda-headlight-assembly-removal.html

-----------

How to Replace a Headlight Door

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-headlight-door.html

----------

How to replace HID headlight bulbs for lexus 400h?

http://schematicsdiagram.blogspot.com/2012/01/how-to-replace-hid-headlight-bulbs-for.html

----------------

These will help.

Thanks.

Ford just came out (in April 2014) with an extended warranty for headlights that don't work on the Mercury Grand Marquis. It is a 15 year/250,000 mile warranty and it is called Customer Satisfaction # 14N01. They will replace the LCM (Lighting Control Module for free. Call your Ford dealer to see if they have the same kind of extended warranty program for the Lincoln Town car LCM, or call Ford Motor Company. It's worth a try.

replaced the low beam headlight on 2004 Navigator, but still wont work. fuses are good.

Yes you should be able to do it yourself. Just go to your local parts store and give them the necessary info for your vehicle. They should have the bulb you need in stock, but if not they can order it and usually have it the next day. If you ask them nicely they might even install the bulb for you. Sometimes the access hole to the side of your radiator might be a tight fit.

here's mountaineer, it should be similar

SECTION 417-01: Exterior Lighting 2002 Explorer/Mountaineer Workshop Manual
REMOVAL AND INSTALLATION Rear Lamp Assembly —Mountaineer Removal and Installation

1. Raise the liftgate and remove the rear lamp assembly screws.

1. Remove the rear lamp assembly.
   • Disconnect the electrical connectors.

1. To install, reverse the removal procedure.
   • If necessary, install new tail lamp bulbs.

high beam or low beam? or both of them on one side.

• One low beam headlamp is inoperative

• Central junction box (CJB) fuse 23 (10A) (RH headlamp).
• CJB fuse 25 (10A) (LH headlamp).
• Circuitry.
• CJB.

• Go To Pinpoint Test C .

• One high beam headlamp is inoperative

• Circuitry.
• Headlamp assembly.

• Go To Pinpoint Test D .

• The high and low beam headlamp is inoperative on one side

• Circuitry.

• REPAIR ground circuit 57 (BK).

• Headlamp switch
• Multifunction switch
• Vehicle Security Module

• Central junction box (CJB) fuse(s):
  • 17 (15A)
  • 23 (10A)
  • 25 (10A)
  • 35 (20A)
  • 40 (20A)
• Circuitry
• Headlamp bulbs
• Daytime running lamp (DRL) relay

your owner manual will list the bulb. It is expensive. tascafordparts.com for discount from Ford Dealer

here's 2003, don't have 2004

Navigator high intensity discharge (HID) headlamp

1. Remove the front radiator air deflector.

1. Remove the three bolts and the headlamp assembly.
• Disconnect the electrical connectors.

8. Remove the headlamp bulb protective cover(s).

• Remove the HID lamp cover.
• Remove the high beam cover.
• Disconnect the electrical connector and push the grommet into the headlamp assembly.

1. Release the spring tabs and remove the HID low beam bulb.

Open hood and remove the radiator site shield and the air delector on top of the headlamp assembly. You will then see 2 clips that you will pull up and then remove the headlamp assembly.

U must crawl under the front bumper, the lights come out from the rear.

hi..Should be a Halogen bulb High-low beam combo maybe.
As you are looking down at the back of the headlight assembly
gently push down on the clip that holds the wiring harness to the
bulb. Now rotate the bulb counter clock wise (left) and then remove
it. Reverse process to install.
check it out..
thank u..
rate me..