I'm trying to get XM on the radio but there is no Sat number coming up on the screen when I push AM/SAT. XM/Sirius needs that number to setup the subscription. They also couldn't do it by VIN. Instead the AM/SAT screen is flashing Antenna. The OEM antenna and receiver are installed and I checked that the cables were plugged in. Does flashing Antenna mean that the radio thinks the antenna is disconnected? Maybe someone with this radio and OEM XM can help me. Thanks