Trim part for automobile with integrated lighting device and process for manufacturing it

Trim component with integrated lighting device comprising a lighting substrate, which in turn comprises a base substrate and a lighting substrate, said lighting substrate being covered by a decorative lining in which have been defined areas that allow light to pass and other areas that prevent light from passing, establishing by their combination a lighting pattern. These areas that allow light to pass are obtained by a laser treatment, removing at least one part of the material of said decorative lining.