I have seen plenty of those units go bad due to road debrit. The lense cover gets so road rashed and you can't buy just that part. I recommend to everyone to clear bra the lens to protect it.
09 335i Coupe LBM - Black Dakota/Glacier aluminum-6spd|Nav|M-Sport|Premium|Logic7|Heated Seats|CA|BMW Performance Suspension & M3 Control Arms|M3 lip spoiler|Avant Garde M510 Wheels
07 335 coupe - Sold