Control unit for a restraint system in a vehicle

A control unit for a restraint system in a vehicle, comprising:

• an evaluation and control unit;
• and
• at least one external ignition circuit interface to which a squib for activating the restraint system is connected via a go-line and a return line, the evaluation and control unit cyclically ascertaining, by measuring, an instantaneous ohmic loop resistance of the corresponding ignition circuit and comparing the ascertained ignition circuit loop resistance with at least one stored threshold value, wherein evaluation and control unit determines an instantaneous temperature in an interior of the vehicle, close to the time for the measured value detection for ascertaining the ignition circuit loop resistance, the evaluation and control unit carrying out a temperature compensation of the ascertained ignition circuit loop resistance for the go-line and the return line of the connected ignition circuit on the basis of the instantaneous temperature in the vehicle interior, the go-line and return line being situated outside the control unit.