An ambient lighting jig assembly generally includes a support assembly, a trim panel, an insert panel, and a light source. The support assembly defines an inner support cavity. The trim panel is configured to be coupled to the support assembly and at least partly defines a jig opening. The insert panel is configured to be rotatably coupled to the support assembly within the jig opening and has a reflective surface. The light source is configured to emit a light stream. Further, the light source is configured to be rotatably coupled to the support assembly within the inner support cavity at a plurality of angular positions so that the light stream is projected onto the reflective surface for use in determining an optimal angle for the insert panel and the light source.