Are you saying that you have everything hooked up, but the starter does not crank the engine over????
SECURITY SYSTEM ?? Try locking and unlocking the drivers door with the key. That's what re-sets the system.
Get a starter jumper button fron a parts store or tool outlet. Hook it up to the starter and see if it cranks. Yes, then perhaps the starter relay is not getting juice, ignition switch??
Use a test light and the TSRM wiring diagram to trace it down.
http://www.cygnusx1.net/Supra/Librar...ction=D&Page=1
I wish you luck, and all green lights.