Reverse (Hydraulic Circuits): Notes
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.
When the gear selector is moved to the Reverse (R) position (from the Park position) the 5-7 reverse solenoid and clutch select control solenoid is commanded ON and the 1 reverse & 6-7-8-9 solenoid is commanded OFF and the following changes occur in the transmission's hydraulic and electrical systems: