Forgot about this part - Homelink transmitter. Part # 1114984-00-B.
Missing the screw that holds the transmitter in place (you can use a ziptie as well).
I had this originally installed on my 3, but moved it to my ‘24 Y. After requesting mobile service to activate HL, the tech could not get it to verify. I brought it into the service center, but they couldn’t get it to work either. They sold me a new unit and so now I have this one.
I believe it should work on any 3/Y, but YMMV. I had an error when trying to add the HL through Service mode (Service —> Low Voltage Battery —> Add Homelink). Any way, this one is free. Pay for shipping and it’s yours.