Inside Rear View Mirror: Notes
WARNING: This page is about a different car, the 2002 Lexus GS 430 and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
Pushing the switch changes the mode between AUTO and DAY. The indicator comes on when the AUTO mode is selected. The mirror surface is normal during the DAY mode. During the AUTO mode, if the mirror detects light from headlights of the vehicle behind you, the mirror surface darkens slightly to reduce the reflected light. The outside rear view mirrors also darken to reduce the reflection of the headlights of the following vehicle.