Help to pinpoint loss of xm signal 2015 Enclave Leather

Chris Owner/Technician Alabama Posted   Latest  
Unsolved
Electrical
Infotainment
2015 Buick Enclave Leather 3.6L (D LLT) 6-spd (6T75)
No Singal On Xm Source. Worked Prior. Mast- Screwed On Was Broke A Car Wash
Customer Replaced Screw On Mast- No Change. Operation Before Mast Breakage Is Unclear (Elderly Customer). I Pulled The Base
Verified No Visable Base Damge
Visible Wires Ok

Need help with someone that has had this common problem. Xm working , not no xm signal. Visual test ok, power is ok. Mast not base broken at car wash, replaced with GM antenna, no change.

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Robert Mobile Technician
Michigan
Robert
 

Chris have you looked up in service information under symptoms and/or a code that would indicate an XM issue to assist you in diagnostics? Also did you look up TSB or PIP and PIT for this issue?

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Chris Owner/Technician
Alabama
Chris
 

Hi Bob, Yes, I did both. There are no codes. I know about the mast and base being for XM vs FM/AM . I believe it to be the antenna base. I have ordered the base. I would have liked to have found a hard fault but I did not. Will see what happens. Thanks!

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Mike Owner/Technician
Ontario
Mike
 

If the display shows loss of signal and the antenna has been replaced, have you tried a reset of the XM portion? My wife's '10 Equinox lost only certain XM channels over night and by resetting the XM signal restored things. Prompts were followed on the radio display, I think it was channel 1 or 0.

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Stephen Technician
Tennessee
Stephen
 

I don’t think that the mast portion of the antenna is for XM. It is for the FM. The XM portion is in the base (above the roof part)of the unit. The base is an active frequency converter for the XM and is powered.

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Rich Mobile Technician
New York
Rich
 

I believe the antenna is on the vcim or it connects there if I remember correctly

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Caleb Diagnostician
Indiana
Caleb
 

The XM coax that plugs into the base/antenna should have 5 or 12 reference on the center pin in the coax coming from the module. The outside shield is ground thru the module.

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