SOWC Servo Piston Applies
WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Reverse & 6-7-8-9 Solenoid
The 1 reverse & 6-7-8-9 solenoid de-energizes releasing pressure against the 1 reverse & 6-7-8-9 regulator valve spring force. This allows LINE fluid to enter the 1 REV/6789 FEED fluid circuit. 1 REV/6789 FEED fluid is routed thru orifice #40 to the latch valve and to the clutch select valve.
Clutch Select Valve
1 REV/6789 FEED fluid is routed thru the clutch select valve into the 1 REVERSE FEED fluid circuit. 1 REVERSE FEED fluid seats ball check valve #10 and is forced thru orifice #49 into the 1 REVERSE APPLY fluid circuit. 1 REVERSE APPLY fluid is directed to the SOWC servo piston.
SOWC Servo Piston
1 REVERSE APPLY fluid is directed into the SOWC servo piston applying pressure against piston spring force.