Circuit/System Description

When the shift lever is moved to the M position, the transmission will enter manual mode. This allows the operator to select an upshift by pressing the right tap shift switch, and downshift by pressing the left tap shift switch. The Body Control Module (BCM) supplies a signal circuit to a resistor network within both normally open switches. When a switch is pressed, a change in voltage drop occurs across the resistor network. This voltage drop is monitored by the BCM. The BCM will send the request to the transmission control module to perform the upshift or downshift.