This summer had to purchase a new key for my '06 highlander hybrid. One of my keys broke and decided to get 2 new keys since the other good key appeared to be wearing and the battery within the key was at least a decade old. The 2 keys cost $ 50 (approximately). Dealer said $ 200+ to reprogram the keys. Decided to do it myself. After several hours I succeeded reprogramming the 2 new keys and both work correctly. I was able to reprogram the first key in not too much time but the 2nd key wouldn't reprogram. Found out that the memory of the vehicle related to key codes only works on 3 keys. The vehicle had in memory the 2 original keys plus the first new key I had programmed. The 2nd new key I was attempting to reprogram would NOT successfully connect. So, had to clear the memory for the keys which was 3 keys and then reprogram the 2 new keys. It was a PIA since I was unaware of the limitation of 3 keys. In the end though it worked, and I saved a couple hundred dollars.

 

Well, that's good for you - but what exactly did you do to program and pair them?

 

If you do not have any of the keys for the vehicle; the yes you will to replace the immobilizer module and program a new master(original) key.

This video explains much about Toyota keys

 

This is going to be expensive Can someone help by letting me know the correct part number of the immobilizer for my Highlander and point me in the direction of instructions on how to swap it out? I'd really appreciate it.