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Hi there. Thanks for posting your question.
The anti-theft and immobilizer systems are part of the original design made to prevent unauthorized entry and operation of the vehicle. It cannot be removed as an aftermarket unit would, nor it has a kill switch. It operates based on signals it gets from the original keys and/or remote fobs. It can be diagnosed using a capable scan tool loaded with the proper software.
Do you have any of the original keys or working remote fobs available?
I was assuming you were having problems with the factory anti-theft/immobilizer system. When you say "device", are you referring to an aftermarket alarm system? If so, there are several brands and models for which we don't have specific information. If you do have the factory version, then it wasn't made to be removed. For more information, you can call Toyota Customer Service at(###) ###-####