Free PDF Downloads
Lexus GS300 / GS400 Wiring Diagrams
Factory OEM electrical wiring diagrams for the Lexus GS300 and GS400. Covers the first-gen JZS147 platform (1995) and second-gen JZS161/UZS161 (1999) — used for 2JZ-GE and 1UZ-FE standalone builds and chassis diagnosis.
The Lexus GS series spans two distinct chassis generations in this resource library. The first-gen GS300 (JZS147, 1993–1997) uses the same 2JZ-GE found in the SC300, making it popular for standalone ECU conversions. The second-gen GS300/GS400 (JZS161/UZS161, 1998–2005) introduced more complex body electronics; the 1999 EWD is the best reference for this generation. Both diagrams cover full engine, chassis, body, and HVAC circuits.
Interactive Wiring Diagrams
Trace a standalone harness circuit by circuit — wire gauge, expected voltages, fault symptoms and multimeter tests.
GS300
1995 Lexus GS300 EWD
Complete factory electrical wiring diagram for the 1995 Lexus GS300 (JZS147). Covers 2JZ-GE engine and full chassis circuits.
GS300/GS400
1999 Lexus GS300 GS400 EWD
Factory electrical wiring diagram for the 1999 Lexus GS300 and GS400 (JZS161/UZS161). Covers 2JZ-GE and 1UZ-FE engines with full body electronics.