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I had that same problem with my 05 TL. It did that a few times when i just had the key turned to the accessory switch (only electrical system was on). I started the car and it then worked, so if the engine is not running when you try it, that may be the problem. But yes it does also need to be the correct disk and mine is orange and i believe each the versions can switch but for each car and year the disk color stays the same for easy tracking/upgrading.
Adam
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