Transmission Control Switch Circuit: Description
WARNING: This page is about a different car, the 2008 Lexus GS 460. However, it is still accessible from the selected car via links, so may be relevant.
When moving the shift lever into the S position using the transmission control switch, it is possible to switch the shift range between "1" (1st range) and "8" (8th range).
Shifting to "+" once raises the shift range by one, and shifting to "-" lowers the shift range by one.