Wiring Diagrams & Resources

Free factory OEM wiring diagrams for Toyota and Lexus platforms — MK4 Supra JZA80, MK3 Supra MA70, SC300/SC400, GS300/GS400, IS300 (SXE10/xX10x/Altezza), LS400/LS430, MR2 SW20, Celica ST184/ST204, and Sienna 2GR-FE. All files are downloadable PDFs.

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Interactive Wiring Diagrams

Click any circuit to trace it through a standalone harness — wire gauge and current rating, expected voltages, what it looks like when it fails, and how to test it with a multimeter. Covers 2JZ-GTE, 7M-GTE, 1UZ-FE and K-series.

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MK4 Supra (JZA80) MK3 Supra (MA70) SC300 / SC400 GS300 / GS400 IS300 LS400 / LS430 MR2 (All Generations) Celica
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