Immobilizer bypass

Not really, this is part of the BCM and the security system which needs to work as designed. What problem are you having maybe we can fix it?

As Ken said the immobilizer is heavily integrated into the vehicle. In the case of Toyota they are even more integrated than others. The old systems where a resistor and switch could bypass any of the antitheft systems are long gone now. These days the key and fob are both sending signals out when the vehicle queries them. In the case of the Toyota system it gets a return signal from the chip in the fob and then uses that with an algorithm in the BCM to create a key code that it then compares to a known good table stored in the ECM. That code changes every time you start the vehicle so it cannot be bypassed electrically because the data exchange changes every time. The more modern systems in most cases are even more complicated. The only ones that go away from that are Kia/Hyundai who don't install security systems in many models. They are changing that though because insurance companies started refusing to insure their cars.