Main Switch Circuit [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
When the blind spot monitor main switch (warning canceling switch assembly) is turned on, a signal is sent to the blind spot monitor sensor LH and the blind spot monitor indicator on the blind spot monitor main switch (warning canceling switch assembly) illuminates. The blind spot monitor system operates according to this signal.