Manual Valve
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
In the LOW (L) position, the manual valve routes line (2) pressure into the drive (19) fluid circuit exactly the same as in DRIVE (D) or INTERMEDIATE (I) range.