Power Source Circuit [03/2019 - ]: Description
WARNING: This page is about a different car, the 2024 Lexus RC F, 2023 Lexus RC F, 2022 Lexus RC F, 2021 Lexus RC F, and 2020 Lexus RC F. However, it is still accessible from the selected car via links, so may be relevant.
When the engine switch is on (IG) 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 H-LP LH relay and H-LP RH relay.
When the engine switch is on (IG), the main body ECU (multiplex network body ECU) supplies power to the headlight ECU sub-assemblies via the IG1 NO. 3 relay.