A lighting device for a motor vehicle includes a cavity, at least one illumination source arranged in the cavity, and at least one detection system which is arranged in the cavity and includes an emitter and/or a receiver designed to transmit and receive electromagnetic waves in a predetermined wavelength range. The lighting device includes a trim arranged in the cavity and behind which the emitter and/or the receiver of the detection system are arranged. The trim includes an interference filter which is transparent in transmission at wavelengths in the predetermined wavelength range and is reflective for the wavelengths transmitted in the visible spectrum.