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Stumped the service center at the dealership again, No XM Signal

3144 Views 11 Replies 8 Participants Last post by  NickD
Everything on the infotainment system works except for the "No XM Signal" message.
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Check the antenna on the roof. It unscrews and may have come loose, reducing reception.
You can try that, but I think that's for AM/FM. XM and GPS would be part of the base. It could be the antenna module or the radio module. The dealer should have a troubleshooting tree that would guide them though that.
Curious to what frequency XM uses and found this: "The XM signal used 12.5 MHz of the S band: 2332.5 to 2345.0 MHz. XM provided 128 kilobits per second of its bandwidth to OnStar Corporation for use with XM-enabled GM vehicles, regardless of whether their owners are XM subscribers." Learn something new every day.

(And in answer to my original question, XM uses a frequency a bit below 2.4GHz WiFi.)
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