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you dont. simple answer.
What you do is get the diagnostics checked for immobiliser fault.
have you dropped the key? Did the chip fall out? Have you tried a spare key?
when you turn the key to crank, does the flashing red immobiliser light turn out? if not, you need an Auto locksmith to code in and make you a new key.
You cannot disable the immobiliser. If it were that easy, any car theif could defeat it by searching the internet. If you dont have any more master keys, you will have to have your local Toyota dealer reseed (reprogram) the immobiliser code, and program new keys for you. It should be about 2 hours labor and cost of keys, but only a dealer can do it. They need to use the Toyota scan tool, and access a Toyota only website with security codes.
Had a similar problem with my x type 2.5 petrol, only had the car 1 day went to start it nothing happend all the lights came up on the dash but the engine wouldn't start and the immobiliser light stayed on. Spoke to Jaguar they had no idea and I couldn't get it to them. After disconnecting the battery trying to reset the immobiliser phoned and auto locksmith they came out and discovered the end of the key with the blade had lost it's coding and the immobiliser was not disarming, they reprogrammed the key and the car started no problem. As far as i know there is no way past the immobiliser. Hope this helps.