Patent ID: 7582984

Claim:
An electronic steering lock including a power supply control unit and a locking assembly, wherein the power supply control unit provides the supply voltage for the locking assembly via a ground supply line and a voltage supply line, the locking assembly only being supplied by the power supply control unit with the supply voltage and ground when a voltage with respect to ground is present on an ignition supply line (terminal 15), which is indicative of the ignition being switched off, wherein the locking assembly includes a locking motor and supplies the latter with the supply voltage and ground, whereby the ground supply of the locking motor is provided via a ground supply switching device, the locking assembly further including a control circuit, which controls the ground supply switching device, wherein the control circuit includes an additional input connection, on which there is a first control signal derived from the ignition supply line, the control circuit producing a second control signal which opens the ground supply switching device when the voltage on the additional input connection is indicative of the ignition being switched on.