Adding aux to xm radio module HELP

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Hello, i have a 2007 chevrolet trailblazer with XM radio module built into the bose oem system. The xm is not active but i would like to use the left and right channel outputs to my speakers to add an aux port/rcas/bluetooth. There is a left and right channel but no negative only a “common ground” i added a loc to it to check and very low volume and than nothing it went dead. Ill attach a schematic if anyone can help would be appreciated thanks

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