looking for some help with the accordion with JSON data

looking for some help with the accordion with JSON data

I'm running into an issue with showing all of the associated data in my accordion, meaning that, not everything is appearing in the expanded view for the header of the accordion

what happening is that, the data is showing as:

BMW:
    325i

Mercedes
    C280

Chevy
    Silverado 2500

and I should be seeing the data as

BMW:
    325i
    525
    M3
    M5

Mercedes
     C280
     s550
     AMG c43

Chevy
   Silverado 2500
   Silverado 3500
   Silverado 1500
   Camero

how can I get all of the models to appear under the manufacture and not just the first model returned?

here is my code:

  2. $.each(data.d.results, function(index, j) {
  3.       header = "<div id='Cars'>"
  4. if(title != preTitle)
  5. {
  7. html += "<h3><a href='#'>" + Title + "</a></h3><div>" 
  8.           html +=  CarModels</div"
  9.           preTitle = title;   
  10.            }
  11. });  
  12.       $("#CarSales").append(header +  output + "</div>" );