Problems in the shared circuitry can cause both turn signals and hazard lights to malfunction. A frequent culprit is a faulty flasher relay or module, which controls the blinking pattern for both systems. This issue may seem small but can lead to serious accidents if not fixed promptly. When headlights are on, the electrical system in your car handles more. The mirror and rear turn signal function normally with the hazards on, but are blinking twice as fast when the turn signal is on, presumably because the front passenger side one isn't working. I purchased a turn signal from BMW and just when I got home to install it my neighbor told me my headlight. It fixed the turn signal and day light running lights, but the adaptive lights and vertical aim controls are still malfunctioning, or at least the car says they're malfunctioning. I honestly can't tell a difference between the right and left headlights in the way they function. Is there anyway to. Ive been having issues with both of the headlights on my car and did some research here and on YouTube and everyone was saying to replace the headlight modules im getting adaptive headlight, daytime light, and turn signal malfunction. Both headlight modules were bad and completely corroded. If your turn signal suddenly stops working while the hazards function normally, don't panic! This guide explores potential causes and solutions.