S-Mode Switch: Description
WARNING: This page is about a different car, the 2013 Nissan 370Z. However, it is still accessible from the selected car via links, so may be relevant.
When S-MODE switch is pressed (less than 1 second), S-MODE indicator illuminates, combination meter sends S-MODE switch signal to ECM via the CAN communication, and then SynchroRev Match mode (SMODE) is activated. When S-MODE is pressed and held (1 second or more), S-MODE indicator turns OFF and S-MODE is cancelled, and then returns to normal M/T.