Abstract: An electronic device for a motor vehicle, includes a first housing portion to receive one or more first electronic components, a second housing portion to receive one or more second electronic components, the second housing assembled with the first housing, and a coolant fluid inlet and a coolant fluid outlet, a coolant channel being provided in the electronic device for the coolant fluid flowing from the inlet to the outlet so as to cool all or part of the first electronic components and/or all or part of the second electronic components, said channel having, over most of the course thereof in the device, in particular over the whole of the course thereof in the device, a section perpendicular to the flow direction of the fluid which is: exclusively provided in the first housing portion or exclusively provided in the second housing portion.