Electronic control unit furnished with power-supply voltage monitoring function and vehicle steering control apparatus equipped with the same

An electronic control unit furnished with a power-supply voltage monitoring function, characterized by comprising:

• an electronic control portion that controls an outside load;
• a power-supply supply portion that adjusts a voltage of an outside power supply to be supplied to a power-supply supply terminal of the electronic control portion to be a voltage within a normal operation range of the electronic control portion and supplies the adjusted voltage;
• and
• multiple monitoring control portions, each of which is furnished with a voltage monitoring function of monitoring a voltage of the power-supply supply portion and an outside load controlling function of controlling the outside load according to a result of the voltage monitoring,
• the electronic control unit being characterized in that:
• in the case where the voltage monitoring function furnished to any one of the multiple monitoring control portions detects that the voltage is on the outside of the normal operation range of the electronic control portion, an outside load driver controlling the outside load is stopped by the outside load controlling function and also at least one of the outside load controlling functions stops the outside load driver controlling the outside load by bypassing the electronic control portion.