A:AnswerComes with the Harness/cables- if* you wish to Add upgrades*, then yes to Extra parts needed- Your best bet is to stop in the Installation entrance on the outside of the building and ask a Tech, they really know their stuff- Good luck!
A:AnswerTo answer your question , I own a 2012 Jeep Wrangler and just purchased/installed this item recently and can only tell you that my Jeep Starts just fine, However No Temp settings, so not sure but stop into Best Buy, the Installation Dept entrance from the outside, they are happy to help- Plus the item is on Sale- Good luck!