An accessory system for a vehicle includes an attachment member attached at an interior surface of a vehicle windshield and an accessory module configured to detachably mount to the attachment member. The accessory module and attachment member are configured so that when the accessory module mounts to the attachment member, an electrical element of the accessory module is biased toward and against the inner surface of the windshield. The electrical element includes a camera and, with the accessory module mounted to the attachment member, the camera has a forward field of view through the windshield. The camera may be associated with at least one of (i) a headlamp control system, (ii) a lane departure warning system, (iii) an adaptive cruise control system, (iv) a sign recognition system, (v) a night vision system, (vi) a pedestrian detection system and (vii) a pre-crash avoidance system.