Automatic High Beam 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.
The main body ECU (multiplex network body ECU) detects auto high beam switch signals.
The automatic high beam system can be turned on and off by operating the auto high beam switch.