1. A device for controlling firing circuits for restraining devices in a motor vehicle, comprising: at least one igniter; output stages; a firing circuit control for connection to the at least one igniter and the output stages; a processor connected to the firing circuit control for controlling the restraining devices, the processor releasing the output stages in response to a crash of the motor vehicle; and a safety IC connected to the firing circuit control for releasing the at least one igniter in response to a crash, the safety IC recognizing a crash; wherein the firing circuit control has blocking inputs and blocking registers for blocking groups of connectable firing circuits which have the output stages and the at least one igniter; wherein, subsequent to the device being switched on, the processor sets the blocking registers and the safety IC connecting the blocking inputs as a function of an occupancy of seats of the motor vehicle; and wherein the firing circuit control logically links data of the blocking inputs and of the blocking registers to one another, in order to block individual groups of firing circuits.