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Home >> Lexus >> 2021 >> RC F Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Headlights >> Lighting System (Ext) - Diagnostic Codes & Circuit Tests >> Lighting System >> Power Source Circuit [03/2019 - ] >> Description

Power Source Circuit [03/2019 - ]: Description

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.