Which of the ECU fuses are you refering too. In my book GS300 2001 there is a #16 fuse (ECU-IG), #29 fuse (ECU-B2, #31 fuse (ECU-B1), which by the manual explanation none of those would indicate anything but (window, door lock, wireless remote, theft, power seat, clock, interior lights..) If you could point us to the right fuse it will make more sense.
Thank you,
Herk