The auto-high beam sensor on my LC worked flawlessly for three months, and now it's acting erratically - staying on when it shouldn't and not coming on when it should.

I suspect the sensor may be dirty (why else would it start acting different). Anyone know where the sensor is located?

 

I have this issue too.I think the sensor is on the top of the windscreen. Mine does not work properly when it is raining or there is mist/condensation.

It is very poor when compared to the systems on BMW and Mercedes as theirs works fine in all weather conditions.