I recently added a subwoofer and amplifier into my 2010 SE Camry with the JBL system.
It took me a long time to find the documentation since it was so new.
I believe they changed the wiring slightly from 2009 to 2010, but a lot of it should be the same.
If you have the JBL system DO NOT hook up to the wires coming off of your head unit. You need to use the wires that are coming off of your factory amplifier that is located under your passenger seat.
If you want the technical documents showing you EVERYTHING you could ever possibly desire (Schematics, Shapes and pinouts on molex connectors)
Go to
https://techinfo.toyota.com/ and sign up for a 2 day account. It costs $15 dollars, but you can save what you need to PDF documents.
This is what I did so trust me they have anything you could possibly need on there.