Your new car came with Homelink and you tried the instructions from the auto manufacturer and it does not work. There are several confounding variables that I have collected over Googling solutions which finally worked for me by trial and error. My equipment includes 2 Genie Promax garage door openers, 2 Genie keychain remote controls, 1 Overhead Door remote control, and a Lexus automobile with Homelink.In your car, you should have Homelink buttons 1,2, and 3. You will need a functioning hand held remote control (transmitter, clicker) with you.
Step 1.
You must first reset Homelink. You can also reset Homelink when you need to start over in programming. Do this by pushing buttons 1 and 3 down at the same time for at least 20 second, or until the solid red light starts blinking. Let go of the buttons.
Push the number you wish to program (in this example, button 1) and hold it down nonstop. While continuously holding down button 1, push the button on your hand held remote control. Vary the distance of the hand held remote control starting from really close to the Homelink buttons and gradually to arm lengths away. Also, vary the button pushing of the hand held remote control from continuously holding down the button to intermittent button pushing. The red light should initially blink slowly and then start blinking very fast when it is programmed.
If you have an old garage door opener, you are done at this point and pushing button 1 again should open the garage door with a solid red light. You can repeat Step 1 for other door openers that use a hand held remote, such as a front gate. If pushing button 1 causes the red light to blink quickly, proceed to Step 2.
Step 2.
If you have a new garage door opener, most likely it has a technology called rolling codes. In this scenario, for the programming of Homelink, there is one more step. This will involve positioning your car close to or underneath the garage door opener motor (the device hanging from the ceiling chained to the garage door) so that you have immediate access from the garage door opener to inside your car. Remember not to position you car directly underneath an open garage door.
Open up a panel on your garage door opener motor (you many need a ladder) and push the Learn Code button, a light should start blinking. Within 30 seconds you must get into your car, or someone else can help you, and push button 1, a total of 3 times. Each push must be at least 3 seconds or until the red light becomes solid red each time. If everything goes well, it should be programmed and the garage door should activate.
Troubleshooting:
If it did not work, there are several confounding variables that you need to figure out.
From reading the several posts out there, one variable is the battery in your hand held remote control. Some batteries are too weak to program Homelink in Step 1, even though the battery can power the remote control to open your garage door without a problem. In this case, replace the battery in your hand held remote control.
Another variable is the hand held remote control itself. Specifically, the frequency output of the hand held remote control. I had 2 duplicate Genie keychain-type remote controls that seemed to program Homelink in Step 1 (the red light changed from a slow blink to a fast blink), but later found out by luck that they were not 
doing the job correctly. I found this out because I had another hand held remote control manufactured by Overhead Door which ultimately programmed Step 1 correctly, so that Homelink was able to Learn Code from the garage door opener motor in Step 2. Homelink states in their documentation that certain hand held remote control frequencies are not compatible with programming Homelink. Someone in a forum posted that changing the frequency on their hand held remote solved the set up problem. Some remote controls have a small switch on the side of the remote control that allow you to change the frequency. Someone else in a forum posted that they had contacted Homelink and the support representative was not successful with troubleshooting and so the representative sent him a hand held remote control from Homelink to try.
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