if its the same issue i had with my 07 i bought this piece and plugged it into something in the trunk

https://www.amazon.com/gp/product/B01M5IYTD9/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

https://www.youtube.com/watch?v=0xSU876zYgc

video showing where