Patent ID: 8195355

Claim:
A fault diagnosis system in a load driving arrangement, the fault diagnosis system, comprising: a load; a driver that drives the load according to a control signal; and a controller that outputs the control signal, wherein the driver comprises a fault detecting means, comprising: a load/driver fault detecting unit that detects a fault in at least either the load or the driver, and outputs a detection result as a detection signal of a high level or a low level depending on whether the load/driver fault detecting unit detects a fault or not, and a logic circuit which is input the detection signal and the control signal, and which outputs, as a monitor signal, a signal opposite to the control signal when the load/driver fault detecting unit detects a fault in the load driving arrangement and which outputs, as a monitor signal, a signal same as the control signal when the load/driver fault detecting unit does not detect a fault in the load driving arrangement, and wherein the controller takes an input of the monitor signal output from the fault detecting means, makes a comparison of the control signal and the monitor signal, and diagnoses whether a fault occurs in the load driving arrangement, based on a result of the comparison.