Method for operating a safety system for a motor vehicle and safety system

A method for operating a safety system for moving a motor vehicle in a parking lot, comprising:

• moving the motor vehicle autonomously within a predetermined area defined by a system boundary in the parking lot in an autonomous driving mode from a delivery point to a predetermined position and then from the predetermined position back to the delivery point;
• detecting, by a detection device of the motor vehicle, a mechanical blocking device of the safety system, wherein the mechanical blocking device forms part of the system boundary;
• transferring the motor vehicle from the autonomous driving mode to a non-autonomous driving mode as a result that the mechanical blocking device is detected;
• detecting a current driving mode of the motor vehicle;
• outputting, by a communication device of the motor vehicle, a driving mode message for opening the mechanical blocking device;
• and opening, according to the driving mode message, the mechanical blocking device for the motor vehicle to exit the predetermined area when the motor vehicle is in the non-autonomous driving mode.