installing aux port

[kwhitehead37231]

i have a 05 nissan murano s. with no aux port. it has the sat button and sat pigtail behind back seat. im wanting to go the less expensive route and not purchase an interphase unless i absolutely have to. so my question is: can i splice into two of the wires in that pigtail, hit the sat button and get audio from a device through doing that. ive seen it done with other factory sat radio pigtails. just not sure which wires to splice into if its possible. any suggestions would be much apprecitaed

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