If all your other audio sources are working fine and you balance is set correctly (BTW - I believe the balance settings are different for each source) then you either have a wiring/connector problem between the factory head unit connectors and the XM Turner, or the XM tuner itself is bad.
Check the pins on the XM Tuner connector. They are very small and one could be bent.
The right audio pin on the factory head unit connector may have been "pushed out" and is not making contact.
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