The present invention is concerned with an accessory module system for a vehicle, the system comprising an accessory module assembly for location against an interior of a vehicle windscreen and which defines a plurality of sites for the modular location of one or more electronic accessories or the like, in particular for communicating with and/or through the vehicle windscreen, the accessory module system also including a cover assembly for location between the windscreen and a rigid frame assembly forming part of the accessory module assembly, the cover assembly being resiliently deformable in order to be capable of closely conforming to the shape of the windscreen.