Hello everyone,
I just installed a Jensen vx4022 in my wife's car with a SXV300. I got a 20' extension cable for the antenna and ran it back to the factory XM antenna. When everything was hooked up and we tried to change her subscription from the original radio to the new unit we got an "antenna shorted" message. Can anyone tell me a way to check the factory antenna to see if it is shorted or check the extension cable to see if the cable is bad?