Submitted by nickjhowe on January 6, 2013
Am starting to examine the car a bit more closely. The rain sensor is documented in the manual and can be seen in this picture:
A bit puzzling because there seems to be more than one sensor built in.
But there's also something built into the back of the mirror. It can't be the auto dimmer because that should be in the mirror face to see headlights behind the car. So that's this front facing sensor? A camera?