1. Look at the key. If the key has a black plastic tip, it is likely a chipped key.
2. Try starting the car without the key. If the car does not start, it is likely because the key is chipped.
3. Check the owner's manual. The owner's manual will usually state whether or not the car has a chipped key.
If you are still not sure whether or not your 2004 Toyota Highlander has a chipped key, you can contact a Toyota dealer.
