My Dodge Durango won't sync with my Liftmaster

Sounds like your receiver has quit working. It is part of the logic board.

If you go to this site you will find all the information you need.

http://www.homelink.com/home.php

Here is the information I have for homelink.

1. Clear out anything previously programmed into the in-car system from the factory by holding down on the 2-outside buttons simultaneously, until the in-car LED starts flashing rapidly. This may take up to a minute (in most cases, the key should be on auxilary, and/or the car door must be shut).
   

2. Decide which button you want to make to be your in-car garage door transmitter. Hold your transmitter up near the selected button, pressing both the garage door remote and the selected in-car transmitter button simultaneously. Hold down on the buttons until the in-car, LED light flashes rapidly. This sets the in-car remote transmitter to be your garage door openers make transmitter, but you are not done. You now need to make this in-car transmitter your personal transmitter.
   

3. Go to the Learn Button on your garage door opener. The button is usually next to the area where the floppy antenna is connected to the motor head. With Genie it is most often behind the light lens, and an indicator light flashes red when pressed. With Sears or Liftmaster (Chamberlain) it is near, or part of, the terminal screw board, and is a red, green or purple square button with a green, amber or purple indicator light. Press this learn button momentarily. The indicator light will turn on and blink if Genie or otherwise stay lit. For Genie systems, go back to the in-car transmitter button you programmed and press this button 3 or 4 times, or until the door starts moving. This should set your in-car transmitter to your garage door opener. For Liftmaster, Sears, or Linear Megacode press and hold the in-car button you programmed until the garage opener light flashes. Your in-car is now programmed to operate your door.

The process is simple but too lengthy to post here.

Goto homelink.com

They make the system and have very complete instructions you can download.

PLEASE NOTE: MOST but not ALL Brands / models of opener will work with this system.

You have to first have your cars Homelink system learn your current remote (follow owners manual) THEN have the garage door opener learn the cars Homelink (push openers learn button then press the Homelink button you previously had learn your remote. Two learning steps required because the LiftMaster is a 'rolling code system'

IF IT IS A CRAFTSMAN / LIFTMASTER / CHAMBERLAIN IT IS A SQUARE BUTTON WITH A LITTLE LED NEXT TO IT. YOU WILL SEE AN ANTENNA WIRE HANGING DOWN, IT IS ON THAT END OF THE UNIT NEAR THE MIDDLE.

HOPE THIS HELPS

You should go to Chamberlains website and you can find their technical assistance phone number. They will help you.

Have you tired reprogramming the remotes to the opener?

The opener receiver board may have failed, which happens. You can order a new one from Sears or other places on the Internet, and they are fairly easy to replace.

Once replaced, you will need to program the receiver to you remotes again.

useful info.

The Learn Button is in a Silver little metal box that is in the opener housing but separate from the opener itself, pry off the case which kinda wraps around the reciever, it will say liftmaster of chamberlain the learn button will be in the reciever