Abstract: An illumination module assembly includes: a first housing part that includes a connector and a positioning window, and can be fastened to a base surface; a second housing part that includes a counterpart connector, which is configured to create a connection with the connector of the first housing part, and has an inner wall section bordering a light exit opening, an outer wall section, and a connecting wall section that connects the inner wall section and the outer wall section; and an operating circuit that includes at least one component being arranged on a component side of a printed circuit board. The printed circuit board is fastened to the second housing part and arranged between the inner wall section and the outer wall section, such that a printed circuit board bottom opposite the component side faces the connecting wall section.