It depends on radio option and radio options depend on year
the early years 05 thru 07 had the early can bus with all but nav radio having knobs where almost 1/2 diameter stuck out past edge of radio plus the REC nav radio
Of these only the most basic radio (single cd non mp3) had a radio face aux input and there were versions both with and without that faceplate input
Next up was RAQ 6 cd changer with mp3 here again no aux input on radio
Next up was RAK same as RAQ plus adds cassette player again no radio face aux input
Top line was the big rectangular face REC nav radio again no radio face aux input
like this
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all these radios have an external sirius module option and you can switch the wires from the serius module 3 line outputs to use with alternate input but must have active sirius subscription
Any can use inline fm moudlator to add aux input to one fm frequency
The RAK can use a casette adapter for aux input
The RAQ RAK and REC are all compatible with oem external DVD player and screen and the dvd player has aus audio and video rca input on face
It is also easy to find a PT cruiser radio (2006 and newer)single cd mp3 with no mp3 that all have face aux input and are plug and play for 05-07 WK
Finally about $15 in hardware and free software to make a matchbook size box with ardrino and can bus shield and 5 volt poser supply to send out can bus signal to make radio think it has a external dvd with aux signal on RAK or RAQ or REC but will not work with REF as they cannot work with VES system