There aren't a whole lot of ways to test a transmitter and the programming requires a factory scan tool so you kinda screwed with this. You need the dealers help even if you replace the transmitter.
Here is the only info on testing the transmitter that I can find.
TRANSMITTER
- Check that the red light flickers when the door lock button or unlock button is pressed on the transmitter.
- Remove the battery and check voltage if the red light doesn't flicker. Standard value : 3 V
- Replace the battery if voltage is below 3 V and replace the remote control switch if it is inoperable after replacing the battery. Battery : Lithium CR2032 (3 V, 220 mA/h)
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