A rear liftgate window assembly for a vehicle includes a glass window panel configured to be pivotally mounted at a rear portion of a vehicle so as to be pivotable between a closed position and an opened position. A lighting device is disposed at an inner surface of the glass window panel and includes (i) at least one light source adhesively attached at the inner surface of the glass window panel, (ii) electrical connectors disposed at the inner surface of the glass window panel, and (iii) electrically conductive traces established at the inner surface of the glass window panel between the light sources and the electrical connectors. The electrical connectors are configured to electrically connect to a power source of the vehicle when the rear liftgate window assembly is mounted at the vehicle.