Headlight Control Relay Circuit
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.
For headlight control relay circuit inspection, see HEADLIGHT RELAY CIRCUIT under CIRCUIT TESTS in BODY CONTROL SYSTEMS article under COMMUNICATION DEVICES in ACCESSORIES & EQUIPMENT.