A sticker assembly includes an indicia-bearing sticker having an adhesive layer. The flat cable includes: first and second extending portions respectively connected to the first and second electronic units sides, and each having a surface extending along the given plane; and a bent portion having a bent surface located between the first and second extending portions, and the bent surface bent to surround a normal line perpendicular to the given plane. The washing liquid circulation system has a sensor device which is sensitive to the dynamic pressure and transmits a signal for controlling a supply valve for fresh water as a function of the dynamic pressure. The panel includes a decorative area made up of plural blank areas and plural hologram areas which together form a decorative image.