Circuit Description
WARNING: This page is about a different car, the 2003 Lexus GS 430, 2003 Lexus GS 300, 2002 Lexus GS 430, and 2002 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
The body ECU No. 2 receives the generator "L" signal from Engine Control Module (ECM) through communication and outputs it to the daytime running light relay. The daytime running light relay judges whether the engine rotates or not with this generator "L" signal and makes the daytime running light turn ON and OFF.