I need a diagram for the location for the horn under the van
look up from below just behind the plane of the radiator. If the horn on an NS minivan won't sound or works intermittently its more commonly the horn switch. The horn switch is part of the airbag module on the steering wheel. The price from a scrap yard or on eBay will be a lot less than the dealership price. Buy one to match the interior color, the outer skin can't be swapped AFAIK.