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I have a 2005 GMC Yukon XL w/Bose and Onstar but no XM or CD Changer, is there an easy way to add an aux input?
Thanks
 

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you may being that you have on star, you have the data bus plug, the extra smaller black one I believe. Just find the pins you need to tap into and try it.

Mr. 960
 

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okay smaller plug at the back of the radio. Pin H DK GRN/WHT remote play back right audio signal. Pin J BRN/WHT remote play back left audio. Pin K BLK/WHT remote play back device common audio signal. You may or may not have the wires already there in the plug. My guess is that you do. I don't think they would make one plug for on star and one for on star and XM. I tend to believe you have the plug or you don't. Have your read the write up about which wires to plug/ tap into with XM? there are a few write ups on it.
 
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