AFS OFF Switch Circuit: Description
WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
The AFS OFF switch uses the multiplex communication system. First make sure that the multiplex communication system is functioning normally before performing troubleshooting on the AFS OFF switch.