A vehicular electronic control unit (ECU) includes a printed circuit board (PCB) and a housing that accommodates the PCB. The PCB includes an electronic component that, when electrically operated, generates heat within the housing. Heat dissipating fins extend along an exterior side of the housing. Heat generated within the housing is dissipated via the heat dissipating fins. A shroud extends along the exterior side and covers the plurality of heat dissipating fins. A passageway extends through the shroud. An airflow source is electrically operated to draw air from within a cavity between the shroud and the exterior side of the housing and along and through the passageway and the drawn air flows between the exterior side and the shroud and along and between the heat dissipating fins to dissipate heat from the plurality of heat dissipating fins.
