How do you reset the anti theft system for the 1990 Toyota Supra?

To reset the anti-theft system on a 1990 Toyota Supra, first ensure that the ignition is turned off. Then, disconnect the negative battery terminal for about 10-15 minutes to reset the system. After reconnecting the battery, turn the ignition to the "ON" position without starting the engine and wait for the anti-theft light to turn off, indicating that the system has been reset. If the issue persists, refer to the vehicle's manual or consult a professional for further assistance.