HomeLink

HomeLink is a wireless control system manufactured by Gentex Corporation and integrated into the vehicles of more than 50 automobile manufacturers. It typically appears as a set of three buttons on the vehicle's sun visor, rear-view mirror housing, or overhead console. Each button can be trained to duplicate the signal of a garage door remote, a powered gate transmitter, or a compatible home automation device.

Programming HomeLink to a modern rolling-code garage door opener requires a two-step process: first, the button is cleared of any previous code and trained to the remote's radio signal by holding both the HomeLink button and the handheld remote close together; second, the opener's learn button is pressed to accept the vehicle's transmission and link the two. The exact procedure varies by HomeLink generation and opener brand, and some older HomeLink systems require a bridge module to communicate with newer rolling-code receivers.

HomeLink operates on standard garage door frequencies (310 MHz, 315 MHz, or 390 MHz in North America) and supports both rolling-code and fixed-code protocols. If a HomeLink button stops working after an opener replacement, the button simply needs to be cleared and re-trained to the new opener—the vehicle's system is not brand-specific.

HomeLink does not require batteries and draws power from the vehicle's electrical system. It is not available as an aftermarket add-on; it is only a factory-installed feature from participating manufacturers.