Headlight Assembly replacement issue?

2013 AUDI A4
170,000 MILES • TURBO • 2WD • AUTOMATIC
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C SILVER
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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?
Jun 13, 2025 at 7:51 PM
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STRAILER
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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 enlarge)
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Jun 14, 2025 at 9:06 AM
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