If you're lucky, the pass key will be on a card that comes with the owners manual and documentation. If the previous owner didn't hang onto that card (as mine did not), then you will have to get into the back and find it on a sticker on the BT module itself. It's a rectangular, aluminum box (about 10" x 5") that should be mounted behind the driver's side rear panel at a 45 degree angle. I actually to loosen the mounting bracket and pull out the module to be able to see the label on my module.

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-"Wax on, right hand. Wax off, left hand. Wax on, wax off. Breathe in through nose, out of mouth. Wax on, wax off. Don't forget to breathe, very important." -Kesuke Miyagi