2-3, 3-4 Shift Solenoid (SS) Valve Assembly (S2)
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.
The 2-3, 3-4 SS valve assembly is de-energized, allowing fluid pressure in the S2 signal (15) fluid circuit to exhaust through the solenoid.