Reverse, 1st Shift Solenoid (SS) Valve Assembly (S1)
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.
Line (2) fluid passes through orifice #3 into the S1 signal (14) fluid circuit in preparation for a shift. The normally open reverse, 1st SS valve assembly is OFF, allowing any fluid pressure in the S1 signal (14) fluid circuit to exhaust through the solenoid.