Door lock cylinders and ignition lock switches were also revised for greater theft protection. The vehicle is started by either hot-wiring or breaking the ignition lock. An ignition lock was added in 1969. In 1968 all models had new carburettors, ignition systems and an ignition lock. All 1970 Darts got the federally mandated steering column and ignition lock. A new ignition lock was located on the right side of the steering column.