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Hello. Welcome to Just Answer. Please allow me to assist you. Is this the 'factory system", ie Is there a red L.E.D. with the word Toyota on the plate blinking?
If it is the 'factory' system, here is how to defeat it:
Open the door
close the door
insert the key into the ignition
turn the key to the ON position (not to start)
Turn the key off
repeat on-off 4 more times.
Then try to start.
(allow 1 second between each of the 5 on-off sequences)
"On" is the position right before the start position
Without knowing what type of alarm this is, I cannot tell you if there is a fuse or not. Experience with these systems is if somebody cuts the power to the alarm, the car will not start, as the alarm is usually wired into the starting circuit. Your best bet here is to follow the wires from the LED to the controller box. Then figure on removing the alarm form the vehicle or looking for another wire from the module that leads to a toggle switch to defeat the alarm.