Testing and Finishing
Now your key is assembled, press one of the buttons on it to observe the red light flash in the LED window. If it doesn't you need to check your battery contacts.
If it flashes take the key to the vehicle and try the buttons to ensure functionality. Key coding may be an issue if LED is observed but functionality isn't.
Now all is well re-apply the key badge. The glue on it should be enough but you may need a small dab of something if it's getting a bit tired.