This is a new 12 pin male to 12 pin female adapter harness that converts the Homelink® buttons on your rear view mirror from being operable at all times to only being operable when the ignition is on, adding a little extra security to your vehicle. Works with all non-backup camera display Homelink® mirrors that have a 12 pin connector located in the back of the mirror housing.
In addition, this adapter can be used in the 2015-2018 Toyota Camry cars and 2020 Toyota Tacoma trucks that were built from the factory with no constant-hot power to the mirror connector (the wire that is supposed to have constant-hot power is on the bottom row of the mirror connector, third from left - see the last picture). If you have acquired a 12 pin Homelink® mirror for your vehicle and and after you plug it in, nothing happens when you press one of the Homelink® buttons, this generally indicates that your vehicle doesn't have constant power on the mirror connector.
HomeLink® consists of three buttons conveniently located on the mirror that can be programmed to operate garage doors, estate gates, security systems, home lighting and other radio-frequency controlled devices. HomeLink® and the HomeLink® House are registered trademarks of Gentex Corporation.