the side plate 10 adjacent to the outside edge 8 b these two soleplates coincide with the support face of the box that receives the window 6 a longitudinal support plate 11 made of plastics material supports light emitting diodes leds 12 the plate 11 is designed to be received in the box so as to position the leds therein for this purpose the plate has fasteners in the form of pins 13 suitable for insertion into orifices 14 provided for this purpose in the box on its side facing towards the window the internal array of ribs has cutouts 15 for receiving the support plate 11 the silkscreen printing 7 around the window defines a transparent strip on either side of the window in register with the leds carried by the support plate given the long lifetime that leds are assumed to have no means are provided in this embodiment for replacing them since the lifetime of the tailgate and thus of the vehicle is assumed to be shorter than that of the leds in the embodiment of fig3 4 and 5 the upright 8 u2032 of the tailgate presents a ribbed structure outside the zones for receiving the light sources 12 that is identical to the structure in the upright described above having an inside edge 8 u2032 a and an outside edge.