Circuit/System Description

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The high voltage (HV) direct current (DC) voltage system is protected by a 125 A fuse. The fuse is located in the high voltage manual disconnect lever and can only be serviced by replacing the HV manual disconnect lever. The fuse is positioned between the negative and positive terminals at hybrid battery 11. If the fuse is open or the high voltage manual disconnect lever is removed, the scan tool parameter will display 0 Volts for hybrid battery 11. The drive motor generator battery control module (GBCM) monitors the high voltage interlock circuit (HVIC) for normal operation along with hybrid battery 11 voltage in order to determine if the high voltage fuse is open. If the fuse is open this could indicate that there may be a short between the positive and negative high voltage DC circuit. The high voltage system is isolated from chassis ground.