VEHICLE CONTROL SYSTEM

A vehicle control system is capable of implementing a fail operation while ensuring safety of traveling of a vehicle even when a power source function failure of a battery occurs. The vehicle control system includes an HV battery, first, second, third and fourth high-voltage relays that are redundantly arranged on an upstream side and a downstream side of the HV battery, a first and second DC-DC converters that are connected to the relays, a first and second high-voltage SW control units that are disposed on a downstream side of the converters and control the relays, and an in-vehicle battery disposed on a downstream side of the second DC-DC converter. The first high-voltage SW control unit and the second high-voltage SW control unit interrupt the relays and control a vehicle based on electric power of the in-vehicle battery on condition that an abnormality of the HV battery is detected.