i just bought the car it was a rental so it does not have onstar or xm i was just wanting to know if the harness to add xm to the factory head unit is in the car even though it did not come with xm from the factory thanks in advance the info!!

 

first of all
and aboard
Greetings from Texas

you would have to buy a separate unit and put it in something like a cell phone mount and use a cord and plug that works on your unit in your car if you have one, you may not since you have a rental

you can listen to it off your smart phone or IPhone and use a cord.