An accessory system for a vehicle includes a mounting element attached at an inner surface of a windshield and configured for mounting of an accessory module thereto and demounting of the accessory module therefrom. The accessory module is configured for mounting to the mounting element via snap attachment. The accessory module accommodates a camera comprising a CMOS photosensor array and a lens. The accessory module is configured so that, when mounted to the mounting element at the windshield, the lens has a field of view through the windshield. The camera is operable to capture image data for use by a driver assistance system of the vehicle. The accessory module includes an electrical connector for electrically connecting with circuitry disposed in the accessory module. The electrical connector is configured for electrical connection to at least a power source of the vehicle and a communication bus of the vehicle.