I just bought a new Chamberlain garage door opener (model c455 in Canada). Tried all the posted programming procedures but could not get the Homelink in my 2005 Crossfire to work with it. Turns out I had to buy the "Liftmaster 855lm Homelink Repeater Kit" to get it to work with the Security+2.0 technology of the door opener. Bought the repeater kit from Amazon and everything works great now.