I know this will sound crazy, but have read that the frequency used in the remotes is also used for broadcast media and cell phones so the key can be completely overpowered in random locations. Recommendation is to take a piece of aluminum foil and make a small box around the immobilizer unit. Put the remote in the box with the immobilizer and press the key. The foil should shield out other frequency sources in the area and allow the key to be read by the immobilizer. I believe its supposed to turn green for start.