Transmission Control Switch Circuit: Description
WARNING: This page is about a different car, the 2007 Lexus SC 430. 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 position between "1" (1st range) and "6" (6th range).
Shifting to "+" once raises the shift range position by one, and shifting to "-" lowers the shift range position by one.