jjslexus

Bought a 2004 ES330 in great condition. The radio has a satellite button. I realize that there is an additional unit that may or may not have been installed in the car when new for it to receive XM or Serius satellite radio. Is there an easy way to figure out if one is installed? If so, I would like to activate it, but not really interested in a $700 purchase of a radio option. All ideas appreciated. Thank you. John