i believe you can use a voltmeter to check the ohms of the "chip" in the key, but im not 100% positive. i never tried it, perhaps ill try tomorrow to see if it comes up with even a reasonable number. but like j0n said, if home depot makes em, just brign the key there to get a copy and be done with it, let them figure it out, if it dont work brign it right back.
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