Wiring Diagrams
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 body control ECU No. 1 and No. 2 wiring diagrams, see BODY COMPUTER under SYSTEM WIRING DIAGRAMS article in ELECTRICAL.