gistfile1.txt

Procedure

First, you need a blank transponder key for your model and year. You can get one
for 10$ or so through eBay or Amazon. Then, have the key cut by your local
  hardware store and make sure it fits your ignition lock: you should be able to
  turn it all the way to the start position and hear the starter going without
  the engine turning on. With the master key (the black key, not the valet key,
  which is grey) and the copy in hand, install yourself in the driver’s seat and
  follow the procedure carefully. It took me about 30 minutes and many tries to
  get the steps right as there is timing involved. Persevere and and it should
  work.

1. Insert the MASTER key in the ignition 5 times, leaving it IN the ignition on the
5th time. Do not turn the key. Don’t rush that step, do it slowly.

2. Open and close the driver’s door 6 times, leaving the door closed on the 6th time.
(the two first steps have to be completed within 30 seconds)

3. Remove the master key from the ignition. The security light should now be solid
red to indicate programming mode. If it’s not, repeat from the beginning.

4. Insert the new key in the ignition but don’t turn it. Do that step quickly as
the computer only stays in this mode for a couple of seconds.

5. The security light will resume blinking.  After 60 seconds (maybe more, be
patient), the light will stop blinking and turn off.

6. Remove the new key, insert the master and turn the engine on and then off.

7. Done! Test your new key. When you insert it, the security light should stop
blinking and the car should start.