An accessory system for a vehicle includes a bracket having a windshield-facing side and a cabin-facing side. The windshield-facing side of the bracket is configured to be bonded by an adhesive at a first windshield location to an in-cabin surface of the vehicle windshield. The cabin-facing side of the bracket includes first structure. An accessory module is configured to mount to the bracket. A housing of the accessory module has second structure that directly engages the first structure of the bracket when mounting the housing to the bracket. An electronic device and circuitry are housed by the housing. With the accessory module mounted to the bracket attached to the vehicle windshield, the circuitry may be in communication with a vehicle bus system of the vehicle.