How can i crank my 99 toyota sienna without the transponder key are immobiliser working

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Ok couple weeks ago i lost my keys to my 99 toyota sienna me not thinking thought bye me tearing the ignition out it would crank no it didnt big mistake.well about a week later i happen to stumble upon my keys now i done tore the ignition out so got to have the transponder key to put close to the immobiliser so it can read the chip and crank so thats how i have been cranking my van.well now i have a bigger problem my immobiliser has broken can someone please tell me how i can get my vehichle crunk