M2 Shift Valve
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
S2 signal (15) fluid is routed to the M2 shift valve and applies the valve against spring force, allowing B1 control 3 (35) fluid to pass through the valve into the second coast clutch (36) fluid circuit.