Have a 1996 2.0L petrol RAV4. Key was sticking in ignition. Bought a new ignition key but am told it needs matched to the ECU? It turns, locks the doors but will not start the car. What is the procedure for doing this myself? "article number" on the key packet is 89785-12020-84. Can anyone detail the procedure to save me shelling out anymore money? It's a key only. The immobiliser is a separate rectangular fob with red and black buttons on it?

This is all I could find... but seems to state that its for 1998 and up...

1. Make sure all doors and windows are closed.
2. Insert Master key into the ignition cylinder. (the ORIGINAL black key that works)
3. Cycle the ignition cylinder from On to OFF five times.
4. Open and close the “driver side” door 6 times.
5. Remove the Master Key and insert the new duplicates key.
6. TURN THE IGNITION CYLINDER ON.
7. The new key will be registered after 60 seconds. The THEFT light on the
Dashboard will go out, indicating that programming has been completed.

Call the dealer.