With the system unenergized a failsafe brake locks the motor and the Handwheel is ungrounded, so driving is normal. The driver energizes the system by depressing the right‑hand thumb switch. After a short self‑check cycle the motor fail-safe brake is released. Since there is as yet no Program signal, the servo holds the angle between the vehicle steering wheel and the Sprint Handwheel to zero, and driving remains normal. When the driver depresses the left‑hand thumb switch the Program is enabled and the grounding brake is applied, freezing the position of the Sprint Handwheel. If "start at speed" is not selected the program starts immediately; with "Start at Speed" the Program will begin when the vehicle has slowed to the preselected speed.