Circuit/System Description

The Body Control Module (BCM) supplies a signal circuit to the sport mode switch. When the sport mode switch is momentarily pressed, the signal circuit is connected to ground. The BCM detects the change in voltage and initiates sport mode and sends a GMLAN message to the transmission control module (TCM) indicating the status of sport mode. The status of the sport mode switch is also sent as a GMLAN message. When sport mode is active, the TCM holds a pending transmission upshift during high speed cornering maneuvers.