Circuit/System Description

The high voltage interlock circuits are utilized to verify high voltage component integrity. The high voltage interlock circuits are two circuit loops that passes through certain high voltage components. The high voltage interlock circuits are used to determine if access to high voltage components is being attempted. The opening of these high voltage components causes high voltage interlock circuit to open. The Starter/Generator Control Module monitors both the high voltage interlock 5 V reference circuit voltage and the high voltage interlock signal circuit voltage in order to detect circuit faults. When the Starter/Generator Control Module detects a loss of high voltage interlock circuit voltage, the high voltage contactors are commanded open.

The service cover for the Starter/Generator and the service cover for the Hybrid/EV Battery Pack each contain a high voltage interlock switch. When either cover is removed, the Starter/Generator Control Module will respond by opening the high voltage contacts. The 5 V reference circuits and signal circuits for each of the two high voltage interlock loops are completely separate from one another and are monitored as two separate loops, with each setting a specific DTC to indicate a circuit fault. The 5 V reference circuit that feeds the high voltage interlock switch on the Starter/Generator also supplies the 5 V reference to the Brake Pedal Position Sensor.