Join Date: Jun 2013
Location: Diamond Bar, CA
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Reprogramming the buttons is doable. It involve some serious door opening and shutting and key putting-in-and-outting. It's really complex but doable. You can google for the result.
As for getting the chip programmed correctly, that's a tough one. I'm not sure if the Walmart route would work. You can always find out if they've got a guarantee and if it doesn't work make sure to get your money back. They'd have to program the key to the one that you already have for the car.
like the others said... basically, there's 2 parts to the factory key:
1: keyless remote (buttons that can easily be programmed to lock/unlock the car)
2: transponder chip (chip inside the remote that sends a signal to ignition/ecu that activates the fuel system so the car will start)
if you only have #1, then you can use the key to remotely lock/unlock the car, but the key will not start the car. most blanks that are bought for cheap online do not come with a transponder chip, and if they do, you'll need that chip coded to work with your car. this is what the dealer will need to do for you. you can program the lock/unlock functions yourself, but you won't be able to use the key to start the car until the dealer properly codes the new chip.
here's how to program your remote: 2007 Scion TC - Free Keyless Remote Fob Entry programming instructions, procedures for all automotive vehicles
did you get a plain/valet key, or just the 1 keyless remote key? if you do have the valet key and don't mind trashing it, then you can pull the transponder chip from that one and put it in your new/blank keyless remote. i got the black keyless remote with the Toyota logo on the back from ebay for like $10 because my old 2005 Scion remotes had worn buttons and the remote itself was cracked. the black toyota remotes have better buttons that don't wear like the rubber scion ones do. I had a locksmith cut the new key, then I just cut out the transponders from the scion keys and inserted them into the toyota remotes. worked perfect for me. you can find shells (no chip) on ebay for as cheap as $4 shipped.
here's a video on how to get the chip out of a valet key:
Transponder Chip Key Bypass How To For Any Car! - YouTube