RAV4 2001,2002,2003,2004 with immobilizer?

Hello friends, I have returned, please answer me all. Last time they brought to my workshop a Rav4 2001 Ke did not turn on and the only thing they did was disconnecting the battery I put the scanner and said there is no communication with the immobilizer and these cars do not bring a encoded key my surprise was what I speak to a friend of the Toyota dealership and told me that they do not bring imm. They do not account for how the ECU is programmed again, I invent a process to do so but it is very complicated so much that I almost do not remember, I have repaired three (2001 aut, 2002 mec, 2003 aut) The question is that yesterday they brought me another 2004 car and I have the same problem if anyone knows anything answer me please.
Today I will start working on remembering how reprogrammed.
Thanks and answer me

The RAV4 that bring immobilizer, or any other type of car with this system, is also recognized because in the starting llavin on the opposite side of the key carries a 2 -line terminal that are the can bus lines. If I do not have them, it is discarded that it is a codified key, otherwise I can be the problem of the computer or the type of software used for the flotilla of your country ..

Hello friend how such .. If it is not trouble I would like you to respond as you solved the Ignition problem of the RAV4 ... because I have the same problem with a RAV4 2003, that when the battery I downloaded it is removed and does not want to turn on again I think the computer is deprogram

Hello, you will see the problem in the case of the diesel without immine

Hello, the same thing happens to me I have a Rav4 year 2001 and it tells me that it has no communication with the immobilizer and nobody has seen me the subject you know what the solution was.