An accessory mounting system for a vehicle includes a bracket attached at a windshield of a vehicle. The bracket has a windshield-facing side and a cabin-facing side. The cabin-facing side of the bracket has first structure. An accessory module has a housing, with an electronic device and circuitry housed in the housing. The electronic device includes a camera that has a CMOS imaging array. The circuitry is in communication with a vehicle bus system of the vehicle. The housing has second structure that is configured to engage the first structure of the bracket when the housing is being attached to the bracket.