I've got a factory Lexus auto that I brought from Wayne at the cartune company in Hamilton, he fitted the surf transfer case on the back and we have wired it to run in manual mode.
I would reccommend ringing cartune and talking to Wayne or Kelvin (07-8479969) as they know all the little tricks and whats easier etc
And all i can say is get some one like Cartune to do any wiring if you are unsure as i had a farkwit

wire up my truck who had apprently wired a few 1uz's before but he made so many fuckup's that all the factory loom and ECU were pulled out and we fitted a link.
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are you meaning that the transfer case is wired to run manual or the auto its self..and is the lexus auto behind a 1uzfe