Abstract: A system for assembling a vehicular window assembly includes a heating device that, when electrically operated, heats an electrical connector disposed at a glass panel of a vehicular window assembly to heat and melt solder disposed between the electrical connector and an electrically conductive trace established at the glass panel to form a solder joint providing electrically-conductive connection between the electrical connector and the electrically conductive trace established at the glass panel. A temperature sensor captures sensor data indicative of a temperature of the electrical connector and the solder. The system, based on processing at an electronic control unit (ECU) of the captured sensor data, adjusts electrical operation of the heating device to adjust the temperature of the electrical connector and the solder during the soldering process that forms the solder joint.