http://isiforums.net/f/showthread.php/5634-No-headlight-illumination the B85 bug is still active(B90). the game recognises the headlights as active(no DQ at night), but you can't see anything because there's no illumination/light cones. you can see that the headlight are on, if you use a cam outside the car. the bug comes on all videocard(both ati & nvidia) and drivers.
Confirmed and reported internally a while ago, too bad the fix didn't make it into this build. 8( All the best, Uwe