If a thermal or electrical fault occurs (e.g., an inverter overtemp), the VCU logs the error and may execute an RAR routine to attempt a safe reset. It commands the actuator to discharge capacitors, reinitialize its internal state, and report back status. If the RAR fails three times, the VCU permanently disables the drive system and lights the check-engine light.
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In the layered architecture of a modern electric or hybrid vehicle, the is the brain. It makes the high-level decisions: "How much torque does the motor need?" "Is it safe to close the high-voltage contactor?" "Should the car prioritize efficiency or performance?" If a thermal or electrical fault occurs (e