Circuit/System Description

When the sport switch is depressed and released, sport mode becomes active. Sport mode changes the transmission shift pattern, as well as the suspension and steering characteristics. Pressing and releasing the sport switch again returns the vehicle to standard mode. The body control module (BCM) supplies a signal circuit to the sport switch. When the sport switch is pressed, the signal circuit is pulled lowed and sport is activated. The BCM continually sends the sport mode status message to the TCM. The BCM internal counter increments each time the sport mode status is sent and the BCM sends the rolling count with the sport mode status. The TCM counter increments each time the sport mode status is received. The DTC will set if the rolling count value of the TCM does not match the rolling count sent from the BCM.