My Toyota Vitz 2007 (also known as Toyota Yaris) key fob battery died about an year ago (The indicator light which comes on when the lock or unlock button is pressed gradually faded away with time).
I didn't replace the battery because it was not possible to open the key without breaking it because it was glued. But, today I bought a new key casing from ebay and cut the old key casing and took out the internal part which has the transmitter. Then I replaced the battery and fixed it in the new key casing.
But, the key fob doesn't work anymore. The indicator light comes up when I press the lock or unlock button, but nothing happens.
What could be wrong here? I read about how to re-program the key, but didn't try it yet because I am not sure what is wrong. Is there any way I can check whether the receiver in the car or the transmitter in the key fob is broken?