An accessory system for a vehicle includes a mounting element attached at an inner surface of a windshield of the vehicle, with the mounting element adapted for mounting of an accessory module thereto and demounting of the accessory module therefrom. The accessory module includes a camera, and electrical circuitry associated with the camera is disposed within the accessory module. The accessory module includes a portion that faces towards the windshield when the accessory module is mounted to the mounting element attached at the windshield. The portion includes wall structure, and the lens of the camera protrudes through the wall structure to exterior of the accessory module. The accessory module and mounting element are configured so that, with the accessory module mounted to the mounting element, the lens is facing towards the windshield and the camera has a field of view appropriate for a driver assistance system of the vehicle.