Where EXACTLY is the key code?

[finaltable]

My Supra was leaking oil so I took it to my local trusted shop. They told me that I needed a new timing belt and where the leak was. I told them to fix it and "while they were at it" could they fix the latch for the rear deck. They told me that it isn't broken; it is in valet mode and I need the non-valet key to get it open. I don't have an original key so I am going to be taking the passenger door apart this weekend. I need to know EXACTLY where I am looking for the code. I've seen the code (my Camry has one) but I would like to know how much of the door I am actually taking apart to be able to read the code.

Thanks.