I just bought a 97 LX 450 and it didn't come with remotes so I got one online. Well, as I'm trying to program it I realize that none of the security lights flash or come on at all. I called a Lexus repair guy and he seemed to think the "brain box" under the driver's seat may be oxidized from shampooing carpets or something. Does anyone know how to reactivate that or should I just go and get a new part put in?

You did the right to call Lexus repair guy . I think he will fix the problem . Don't worry about it .