Garage door opener, 2003 town car no longer works

doors

#1

WOULD LIKE TO KNOW WHAT IS SOURCE FOR POWER TO GARAGE DOOR OPENER IN MY CAR. OR WHAT IT WOULD TAKE TO CORRECT. THE WINDOW THAT SHOWS SIGNAL SENT WHEN OPENER BUTTON PUSHED DOES NOT CHANGE FROM THE DIRECTION WHICH IN IN THE WINDOW. ALL OTHER FUNCTIONS OF THIS HOUSING WORKING.