Early '89 Wiring harness pinout with colors
This is the wiring for an early '89 Turbo Supra 5-speed. The plugs will actually fit a '87 and '88 but the wires were changed and removed from some plugs so please note the differences.
A lot of people think there are 87-88, 89-92 wiring harnesses, but there are more combos. Hope this helps.
B1 Plug
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1. Heater Water VSV---------------------------- Black \ Yellow
2. L3 to ECU used for -TEMS------------------------------------ Red / White
3. L2to ECU used for TEMS------------------------------------- RED
4. L1 TO ECU used for TEMS------------------------------------- BLACK
5. Check Connector for Fuel p--------------------------- Black \ Red
6. Circuit opening relay coil---------------------------------- GREEN
7. A/T circuit for coil opening relay----------------------Medium / Black Blue
8. Fuel Pump Relay on ECU----------------------------- YELLOW
9. Switched 12v For EFI From Fuse box- also +B check connector--------- Black \ Red Medium
10. A/C water temp switch ---------------------- Green \ Red
11. Goes to Start Solenoid-------------------------- HUGE Black \ Blue
12. A/C Compressor Magnate switch TO ECU------------------ Blue \ Red
13. TEMS Check Singal------------------------------------ Purple
14. NSW for clutch TO ECU -----------------------Black \ Yellow
15. Ignition switch to ECU-------------------------- Gray
16. +12v for igniter and fuel injectors etc, also resistor in engine bay --------------BIG Black \ Orange
17. Theft deterrent horn plug on harness -----------Yellow \ Blue
18. From headlight relay for Idle up, goes to ECU ---- ----------–Red \ Yellow
