A method of operating a security system using a vehicle and preventing access to a vehicle system and to a vehicle garage may entail monitoring a security condition of the vehicle with a vehicle electronic control unit ("ECU"). Upon detecting an unsecure condition, such as a vibration, an alarm may sound and then the ECU may deactivate a vehicle system, such as a navigation system, to prevent access to personal or business addresses. Further, devices such as garage door openers in the vehicle and an in-garage, garage door opener may be disabled by satellite, cell tower, wire or direct wireless communication between the ECU and the device to be disabled. Silencing the vehicle alarm and reactivating all garage door openers and the navigation system may be accomplished by turning a key within an exterior vehicle lock or entering a code into the navigation system.