Power Source Circuit [02/2017 - 09/2019]: Description
WARNING: This page is about a different car, the 2019 Toyota C-HR and 2018 Toyota C-HR. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition switch is ON or the operation conditions of the headlights are met, the main body ECU (multiplex network body ECU) supplies power to the headlight ECU sub-assemblies via the No. 1 integration relay.
When the ignition switch is ON, the main body ECU (multiplex network body ECU) supplies power to the headlight ECU sub-assemblies via the IG1-NO. 1 relay.