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If it is a homelink system (factory) the proceedure is in the owners manual. You will need an operational opener for your garage.
This link explains the programming process- http://www.homelink.com/programming/programming.taf
2003 nissan altima visor garage door opener progarming
To program your on-board factory garage door opener on your Maxima's visor, you first have to press and hold the first and third (outer two) buttons down at the same time for about 15 seconds without letting them go. Then, the middle button's red light will start to flash. When this happens, let go of the two outer buttons and immediately get your original garage door opener and hold it right near your visor, aiming it right at the three buttons. Press and hold the middle button down for about 5 seconds while you simultaneously press and hold your original garage door opener's button down for this same amount of time (5 seconds). After this process is complete, wait a few seconds and you should now be able to use this middle button as your "new" garage door opener!
The same way you'd deprogram a remote control for a Phillips TV to work on a Sony DVD player. In other words, you DON'T.
Google the question: how do I program a 2011 Nissan Pathfinder garage door opener and it will send you on a mobius strip dearch and ask you to answer the question... how stupid.....
Push and hold the two outer buttons until the LED flashes fast Approx (15 seconds) then hold your garage opener up to the mirror or visor and push and hold any button 3 or 4 seconds on the opener Now the Home Link is programed. With the car safely away from the closing garage door find and push the garage openers red programming button (on the motor assembly somewhere that gives you about 30 seconds to push your cars home link button so the garage opener learns the button you want to use for that door the other two buttons can be programed for other doors or house light controler gate opener in the same manner
If you push the two outside buttons on your Homelink system until the light goes from a steady light to a flashing light, it should clear all stored codes in your system once it starts flashing.
IT IS NOT A OPENER I FOUND. IT BELONGS TO US BUT FOR SOME REASON THE GATE AND GARAGE OPENER GOT MIXED UP AND I DON'T KNOW WHERE TO FIND THE CODE ON THE OPENER OF GARAGE TO RE-SET THE REMOTE
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form_title= Garage Door Opener Parts form_header= Problems with your door opener? Purchase parts. What brand of door opener do you own?*= _ [50] How old is the opener?*= _ [50] When was the garage last serviced?*= _ [50]
How do you un program garage door opener