A stepping motor control device for an automobile air-conditioning system has a key-off home-position setting unit of a stepping motor for driving an air-conditioning door in response to switching of a key switch of the automobile off. The key-off home-position setting unit, responsive to switch of the key switch off, drives the stepping motor so that the air-conditioning door comes to a full-close position or a full-open position, stores data indicative of the full-close or full-open positions, as a current position of the air-conditioning door in a memory, and thereby finishes a home-position setting of the stepping motor. The key-off home-position setting unit is supplied with power from a power source under control of a timer for a prescribed time within which a home-position setting can be finished. When the key switch is turned on, the key-on control unit judges whether or not a current position of the air-conditioning door given by the key-off home-position setting unit is stored in the memory, and starts a normal air-conditioning control without performing a home-position setting if the current position is stored.

A combination lock wherein the tumblers can be moved to predetermined positions, preparatory to retraction of the locking bolt from extended position, by an electric motor which is controlled by a microprocessor. The microprocessor receives signals from a keyboard or from a disc and can start the motor for the purpose of aligning the normally scrambled tumblers only in response to reception of a predetermined sequence of signals. A manually operated knob can be coupled to a driver for the tumblers in order to change the positions of the tumblers and/or to move the locking bolt between extended and retracted positions independently of the motor. The microprocessor is programmed to start the motor only in response to reception of a predetermined sequence of signals in accordance with a selected combination.

A steering lock system includes at least an ignition switch and a locking mechanism capable of inhibiting the turning of a steering shaft. In a state in which the steering lock system is retained by a retaining means on a support table, a movable table is moved toward the support table, a turnable shaft which includes a key chuck means retaining a key at its tip end is rotatably driven by a driving means, thereby rotatably driving a rotor of the steering lock system. By examining the change in the switching mode of the ignition switch in accordance with the turning of the rotor by a switch signal checking means and examining the operational state of the locking mechanism by a locking operation examining means, the inspection can be conducted continuously and automatically on the operation of at least the ignition switch and the locking mechanism of the steering lock system. Thus, it is possible to inspect the operation of the steering lock system, while reducing the number of operating steps and the operating space.