I was doing a little research with my GM SI CDs looking at the sound system on the Tahoe / Yukon, which comes with the XM radio option.
The radio itself "looks" exactly like ours. However, the XM option adds a separate tuner module mounted under the dash behind the glovebox area. To select XM radio on those vehicles, you scroll with the "band" button to select XM.
I am curious if the connectors for the XM module are part of our wiring harness behind the glovebox.
Klaus
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