2007 Hyundai Santa Fe Headlight

This suggests the battery, but I have other ideas

https://www.google.com/search?q=2015+Hyundai+Santa+Fe.+One+headlight+flashing

This says it has a standard H8, halogen or LED or HID. If someone has replaced Halogen with either HID or LED, the control circuits can interfere with the car's BCM. Both HID and LED can flash when they are failing.

https://www.google.com/search?q=2015+Hyundai+Santa+Fe+headlight+type

Or you have a loose connection. Power or ground.

..

You should have a 10amp headlight fuse, and two 15amp fuses - one for each side low beam. And there is a relay for each low beam plus one for the high beams. The headlight switch provides the ground circuit.
The fuses and relays are in the fuse box in the engine compartment.
Check your owners manual for details.

glad you found the problem and thanks for trying Fixya.

If you only have two headlights ,the low beam part of light is out

look in plug bad or loose connection can cause this problem . check wiring going to other light

1. Before servicing the vehicle, refer to the Precautions Section.
   
2. Disconnect the negative (-) battery terminal.
   
3. Loosen the mounting bolts and nut of headlight assembly (A).
   

   Loosen the mounting bolts and nut of headlight assembly (A)-Santa Fe
   Click to Enlarge

   Loosen the mounting bolts and nut of headlight assembly-Veracruz
   Click to Enlarge

4. Take care that retaining clip (A) is not to be damaged-Santa Fe.
   

   Take care that retaining clip (A) is not to be damaged-Santa Fe
   

5. Disconnect the headlight electrical connectors.
   
6. Remove the headlight assembly.
   
7. Remove the headlight bulb:
   
   • Remove the headlight bulb(s) with a counterclockwise turn-Santa Fe.
     
   • Remove the headlight bulb after removing the bulb caps (A)-Veracruz.
     

     Remove the head lamp bulb(s) with a counterclockwise turn-Santa Fe
     

     Remove the headlight bulb after removing the bulb caps (A)-Veracruz
     

To install:

1. Install the headlight bulbs.
   
2. Install the headlight bulb caps-Veracruz.
   
3. Connect the headlight electrical connector.
   
4. Install the headlight assembly.
   
5. Connect the negative (-) battery termina

once bolts out lift up on the headlight unit hope this helps plz vote comment reply if you need more help

most likely a fuse problem

2003 Hyundai Santa Fe - Sylvania Headlight Bulb Part number: SY-9003ST Manufacturer number: 9003ST var images0 = 'L2ltYWdlcy9wcm9kdWN0X2ltYWdlcy9pbWFnZXMvc3lsdmFuaWEvU1ktOTAwM1NULmpwZw=='; var products0 = 'U3lsdmFuaWEgSGVhZGxpZ2h0IEJ1bGI='; var descriptions0 = 'U1lMVkFOSUEgOTAwMyBTSUxWRVJTVEFSIEhJR0ggUEVSRk9STUFOQ0UgSEFMT0dFTiBIRUFETElHSFQgQlVMQiAtLSBMb3cgNTUvaGlnaCA2MCB3YXR0cywgRHVhbCBDLTggZmlsYW1lbnQgZm9yIGJvdGggaGlnaCBiZWFtIGFuZCBsb3cgYmVhbTsgMTAwIHBlcmNlbnQgbGVnYWwgaGFsb2dlbiBoZWFkbGlnaHQgYnVsYnM7IEZlYXR1cmVzIHRoZSB3aGl0ZXN0IGFuZCBicmlnaHRlc3QgbGlnaHQgY29sb3Igc2ltaWxhciB0byBkYXlsaWdodCBmb3Igc2FmZXIgbmlnaHQgZHJpdmluZzsgTWVldHMgYWxsIFVTIEZNVlNTIDEwOCBhbmQgQ2FuYWRpYW4gQ01WU1MgMTA4IHJlcXVpcmVtZW50cy4='; zoom

Headlight low beams blow simultaneously sometimes. Actually quite often, for some reason.

Check for voltage with a 12v test light or a voltmeter at the light bulb plug.

There is a fuse, but only for both headlights, not just one. The headlight bulb must be out. Or the wire connector came off. Take care and God Bless.