There is information on the side of the radio module itself. If you look at the label it will tell you the build date for the unit. If the build date is prior to 10/02 then it doesn't support AUX or Siruis. If it's from around 10/02 to 10/03 then it will support Aux but not Sirius. If it's newer than 10/03 then it will support both Aux and Sirius.

If you have a 2002 and the radio module is the original one from the factory then you don't have Aux nor Sirius capability.

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