Abstract: A motor vehicle seat assembly has a seat body including a seat base portion and a seat back portion. A swivel mechanism moves the seat body between a first position for entering or exiting the vehicle and a second position for operating or traveling in the vehicle and includes a weight sensor and a motor for rotating the seat body. When a vehicle door is opened, the motor rotates the seat body into the first position and when the weight sensor detects the presence of an occupant, the motor rotates the seat body into the second position and a seat belt is moved into a position to secure the occupant in the seat body. A pulse sensor triggers an alarm if it detects a pulse rate indicating that the occupant is falling asleep. The assembly further includes a massage system, a heating unit and a cooling unit.