Circuit/System Description

Vehicles equipped with DC charging capabilities include a separate DC charging circuit and 2 contactors to connect this system directly to the battery pack for 400+ V offboard charging. A set of sensors internal to the battery disconnect unit provides voltage data to the battery energy control module 1.

To verify integrity of the circuits, the battery disconnect module will close the positive contactor of the DC charging circuit and measure the voltage across the negative contactor. Each time the vehicle is driven and the transmission range shifted to the Park position the test is reversed and then the negative contactor is closed and voltage is measured across the positive contactor. This testing process continues to alternate. Voltage detected during this test indicates that there is a short across the positive and negative DC charging circuits.