If you have a low beam & high beam failure or DRL (DayTime Running Lights) LED strip failure or AFS Malfunction issue at your Audi A4 S4 B8 pre-facelift (2007-2012) bi-xenon headlight (8K0941003C, 8K0941003D, 8K0941004C, 8K0941004D, 8K0941003Q, 8K0941004Q etc…), you should watch this video carefully. The function of every single main part consisting this bi-xenon headlight is explained in details: ballast, LED Module, AFS Module and HID bulb.
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