Circuit/System Description

WARNING: This page is about a different variant/trim than selected.

At times, it may be necessary to disconnect high voltage from the vehicle, both during normal operation and when a system fault is identified. The Starter/Generator Control Module controls the Main Contactor and pre-charge contactor to disconnect and connect high voltage from the vehicle. The high voltage contactors are switches that are controlled much like a relay. To disable high voltage from the vehicle, the main and pre-charge contactors are commanded open. This will open the contactors and physically disconnect the hybrid/EV battery positive cable. To connect high voltage to the vehicle, first the pre-charge contactor is closed. With the pre-charge contactor closed, current flows through the pre-charge resistor. This allows high voltage to slowly build in the system, as the resistor decreases current flow. Once high voltage is brought up though the pre-charge contactor, the Main Contactor is close and high voltage is active. If the high voltage builds too quickly or too slowly, the Starter/Generator Control Module will set a fault.

Is a system fault occurs that does not allow the contactors to open, the Starter/Generator Control Module will be unable to disconnect high voltage from the vehicle. In instances such as this, the manual disconnect lever will disconnect high voltage from the vehicle when servicing.