The method I have tried is:- 1. Close all the vehicle doors. 2. Note: Make sure the door lock cylinder is held in the unlock position for more than 0.5 seconds. Insert the key into the driver door lock cylinder and turn the key from the rest position to the unlock position three times within five seconds. 3. The door lock light emitting diodes (LED)s will illuminate for 15 seconds during the remote transmitter programming mode, allowing the remote transmitter to be programmed. 4. Remove the key from the driver door lock cylinder and aim the remote transmitter at the interior rear view mirror. 5. Press and hold the LOCK button on the remote transmitter. 6. While holding the LOCK button down, press the UNLOCK button three times on the remote transmitter. 7. Release both buttons simultaneously. 8. Make sure the door lock LEDs flash five times, confirming that the remote transmitter has been programmed. 9. After a remote transmitter has been successfully programmed, the GEM will reset the programming mode, allowing a further 15 seconds to program the next remote transmitter Is this the one you used? Also do daft question but do tinted Windows have an effect?