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Lexus LS400 / LS430 Wiring Diagrams
Factory OEM electrical wiring diagrams for the Lexus LS400 (UCF20) and LS430 (UCF30). The 1UZ-FE and 3UZ-FE V8 engines are popular swap candidates — these diagrams are the definitive wiring reference for engine, chassis, and body circuits.
The Lexus LS400 (UCF20, 1995–2000) and LS430 (UCF30, 2001–2006) are flagship luxury sedans powered by the 1UZ-FE and 3UZ-FE V8 respectively. Both engines are heavily used in engine swaps — the 1UZ-FE in particular is popular in the MK3 Supra, SC300, and various drift builds. These EWDs are essential for isolating the engine harness from the body loom and understanding sensor locations and connector pinouts. SVK Works builds universal 1UZ-FE engine harnesses for standalone ECU applications.
LS400
1998 Lexus LS400 EWD
Factory technical service and wiring reference for the 1998 Lexus LS400 (UCF20). Covers 1UZ-FE engine, chassis, and body circuits.
LS430
2005 Lexus LS430 EWD
Factory electrical wiring diagram for the 2005 Lexus LS430 (UCF30). Covers 3UZ-FE engine and full chassis electronics.