2 things to not have Sirius show on the display.

1) OLD nav software. Upgrade to latest one
2) OLD software in Radio. Upgrade to latest one (by getting a new radio). If newest one, make sure in US mode. use the radio service mode to check.

NO CDC Audio.... that is a different story. If no audio on the CDC. Remove the 12 pin harness from the Sirius TO CDCD and MOVE the white brown wire from location 2 to location 3! Old CDC has a different audio ground pin location.

If you are near Austin, Tx feel free to swing by and I can take a look. I have gotten Sirius to work in a 1999 E38, I know I can get it to work in the 2003 X5

Martin