Circuit/System Description
WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The transmission adaptive pressure (TAP) shift system allows the driver to manually shift gears by using the TAP shift switches located on the automatic transmission shifter. Pushing the Up switch will command an upshift and pushing the Down switch will command a downshift. The TAP shift system is activated when the gear selector is in the manual L (M) position. In the L (M) range position, the TAP enable switch is closed and this activates the system by completing the TAP enable signal circuit from the BCM to ground. TAP system is deactivated in all other range positions.