Just ran into this over the holidays- my Trailblazer has embedded XM receiver and it just failed with a No Signal message on the display. I did a bit of searching on the internet and found the usual half-correct information but enough for me to locate the receiver, wiring connections etc after a bit of disassembly.
Fortunately, I have a car kit in another vehicle and so I could substitute the antenna from that. It plugged directly into the receiver and viola! works again.
So now I need to determine if it is the vehicle antenna or cabling from receiver to antenna. The antenna is above the headliner on the passenger side. Removing the visor and heysoos (sic) handle, I can access the antenna and connection to the cable. The cable runs down the passenger A pillar, across the dash vents and disappears into the frame only to reappear behind the lower hush panel by the receiver. It would not be easy to replace. One documentation source shows another connector hidden along the length but almost impossible to verify on the vehicle.
Here’s where it gets maddening. The radio has a male connector. So does the vehicle antenna. So the cable connecting them is female to female. This means I cannot plug the antenna directly into the radio! Nor can I plug my replacement antenna into the cable! I can’t check anything without buying some replacement parts first. What bonehead came up with this scheme?!? Why would you not have the entire chain M-F-M-F? As it is, nothing can be substituted to isolate the problem…morons.
Don’t get me started on the XM antennas either. The car antenna connector is ever so slightly different than the home antenna connector. Just enough so they cannot be interchanged. The OD of the barrel is just a hair too large. The center pin is recessed into the insulator a micron more and they cannot be swapped. There is no other reason they could not be swapped, the antenna itself is the same construction…