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Most likely the antenna lead has come unhooked from the back of the radio. AM stations will pick up with the internal working of the radio, but FM stations have to have a working antenna to work. Also make the antenna is tight to the vehicle .
Check your antenna. If the mast is not extended, your reception will be limited. try an AM station, usually a local AM station will still come in even with the mast down. Have you tried playing a CD (if equipped) ? If that plays well, you've confirmed lack of reception as the problem. If the mast is extended and you still do not have reception, the antenna plug my have come out of the back of the radio. The requires removing the radio to check.
the operator guide in the glove box , covers time set.
all radios do that.
and if not normal, the antenna is broken or fell off the rear of radio.
if got static switch to FM ,
many AM stations, broadcase to am and fm same content.
so use FM. its static free. (by design) but does fade sooner.
you can in fact hear AM station 12,000 miles away it night
called super stations, 50,000 watt stations. ive done this many time.
did you try another car, in same spot , and same station?
are you in under ground parking?
1: too far from station.? 2: antenna not fully extended or auto extend antenna is dead. 3: noise, AM is subject to huge noise. FM was invented to end that. 4: near fluorescent lights. (you never said where you are)? in the garage, down town, or on top of Pikes peak. location is everything. so is the station ID, and your location, (distance) 5: in a lightening storm?
try any hand held battery powered radio ,on AM, is it noisy too. bingo, its real.
you may be in an area where am stations don't come in,, am uses straight lines of frequency where FM uses a modulated signal, which travels much farther, I bought a antenna signal booster from radio shack for a few dollars , and was able to get the stations, some pretty static filled though, but the more local ones came in ok, another thing to check is that the unit is plugged into a grounded receptacle ,
The "hard wired" version that you speak of apparently only refers to the power supply.Do you have a seperate display for the Sirius unit? Now, you failed to mention the type of radio (factory or aftermarket); so, if you have to use an "empty radio station" then you have an FM modulator. This modulator could wired or wireless. The wired version interrupts the vehicle antenna wire and the station on said modulator is usually preset to either 88.1, 88.3,88.7, or 89.1. There is no need to power this modulator up, it comes on when then Sirius comes on. One way to check for power is to turn on the Sirius unit and tune your radio to an occupied Fm station. Wait a few seconds and listen to the reception. Turn off the Sirius unit, the reception should improve for the occupied station. If it is a wireless FM modulator it also has preset stations that you can change but, extending the wieless antenna will greatly improve your reception of the Sirius stations.