an apparatus and method for installing an air bag module for an air bag system equipped in an automotive vehicle for preventing injuries to passengers in a passenger compartment of the automotive vehicle . the system includes an air bag module located to face a passenger in the passenger compartment , a controller mounted to the body of the automotive vehicle for controlling the air bag module and an electrical harness wire for transmitting signals for controlling the module . this harness wire is connected at one end to the air bag module and at the other end to the controller . a flexible temporary holding band for connecting the air bag module is detachably mounted on a hook provided in the passenger compartment . the length of the temporary holding band is determined to be short enough so that the harness wire is still loose even when the temporary holding band is put under strain .