Firing Up the SiriusHere are the steps to hook up your satellite account.* Turn on the head unit and select the External setting via the source button.* The tuner will read "updating."* While that is happening, write down the SID number printed on the boxand keep it handy.* Wait till the unit displays the "Call 1-888-539-SIRIUS to subscribe."* Call the number and pick a plan. We went with the six-month plan that cost us $12.95 a month.* You can also do this online, but since the unit must beon to receive the updated signal, it's easier to do via the phone sitting in the driver seat.