A method for controlling access to a terminal device includes collecting light signals emitted by a lighting device of an electronic device. In order to realize a disengaging of the frictionally-locked connection between an actuating means of a center position device and a coupling shaft in the event of a crash; i. A mutagenic primer pair is annealed to opposite strands of a circular DNA molecule containing the DNA sequence to be mutagenized. The first doping region, when its electrostatic discharge current is greater than a predetermined current, reduces the potential difference between the node and the reference potential.