Headlight Assembly replacement issue?

Tiny
C SILVER
  • MEMBER
  • 2013 AUDI A4
  • TURBO
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Just replaced the driver side headlight assembly for the vehicle listed above 2T 4 door. Also replaced the bulb. Everything works except for the headlight beam. Tried a second new bulb. Nothing. Fuses appear to be good. What do you suggest?
Friday, June 13th, 2025 AT 7:51 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 52,185 POSTS
Does this car have the HID's? If not, I would test the yel/blk wire for power with the headlights on. This guide can help you:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

If you don't have power, then you have a bad vehicle electrical system control module. Here are the wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Saturday, June 14th, 2025 AT 9:06 AM

Please login or register to post a reply.

Related Headlight Lens Content

Headlight Lens Housing Restore
VIDEO
Headlight Lens Housing Restore
Instructional repair video
Headlight Lens Replacement
GUIDE
Headlight Lens Replacement
The headlight lens or housing is responsible for directing the light beam from the headlight bulb and can also locate the turn signal bulb. This lens should remain clean...
VIEW MORE