Drive device

A drive device that drives a load, the drive device comprising:

• a first upstream switch disposed upstream from the load in a first current path of current flowing via the load;
• a first downstream switch disposed downstream from the load in the first current path;
• a second upstream switch disposed upstream from the load in a second current path of current flowing via the load;
• a second downstream switch disposed downstream from the load in the second current path;
• a current detection circuit that detects current flowing via the first upstream switch;
• a stop circuit that stops flow of the current via the first upstream switch when the current detected by the current detection circuit becomes greater than or equal to a current threshold, wherein a direction of the current flowing in the load when current is flowing in the first current path is different from a direction of the current flowing in the load when current is flowing in the second current path;
• a series circuit in which a first resistor, a second resistor, and a circuit switch are connected in series, a connection node between the first resistor and the second resistor is connected to a connection node between the load, the first downstream switch, and the second upstream switch, and to which a constant voltage is applied;
• a voltage detection circuit that detects a voltage at the connection node between the first resistor and the second resistor;
• and
• a processing unit that executes processing, wherein the processing unit executes processing of:
• switching the circuit switch on or off;
• and
• detecting a failure in circuitry that drives the load on the basis of the voltage detected by the voltage detection circuit in an off instruction state in which turning off of the first upstream switch, the first downstream switch, the second upstream switch, and the second downstream switch is instructed.