Instead of cutting the factory plug, use a (Metra, Scosche, Axxess). Example: Metra 70-1761 (for most 1990-2000s Toyota). That way you keep the factory diagram intact and avoid guessing.
If the goal is to replace the Toyota Fujitsu Ten 86120 with an aftermarket head unit (Pioneer, Sony, Kenwood, etc.), using a wiring harness adapter is the industry standard.
This connector handles the primary electrical connections and the front audio channels. Front Right Speaker (+) Pin 2 (Green): Front Left Speaker (+) Pin 3 (Gray): +12V Ignition/ACC (Switched Power)
DIY installers, car audio hobbyists, troubleshooting no power/sound. Not recommended for: Beginners without a multimeter, or anyone using a mismatched diagram.