FrontDefroster Light Does Not Turn OFF

After the Mirror with Homelink was installed, i noticed my Front Defroster light (the little red one on the bottom)did not go out after I turned it on, then hit it again to turn it off. The light does go out if I switch to Automatic then use OFF. It does not go out once on if I hit OFF although the defroster does go OFF. Does anyone have any ideas? I will ask the dealer when I go back for plates or service, which ever comes first.