okay, there'* nothing on the internet.. just call up the company and see how much it'll be. Reverse engineering stuff is hard.. especially if you don't know the language the reader is in [and no i'm not talking about english
], and if it doesn't have a PC interface.. which some of them do, but I don't see your model there. Personally even I don't think I could do this one, and I reverse engineer software all the time.. Not that I am saying you arn't capable of doing this, but if you've never done this before, this is not the thing to start on. If you know the key for Chrysler, then you may be able to start from that if its human readable.. otherwise just pay for the code.
PS: software piracy is illegal, and I am not liable for anyone pirating, reverse engineering, and "cracking" software. The FBI won't come to your door saying "do you have any pirated software, and search your house, compuer, and electronics for pirated software.. but nonetheless its still illegal.