I just successfully reinstalled a new antenna mast and the radio seems to work except that the fm signal cuts off randomly after about 2 min. of use and works again in a few minutes only to become static once again. Where is the problem coming from? The radio unit is a CR-915.
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Most antennas are located in the windshield or back window... there are booster boxes that boost the signal on its way to your receiver
somtimes they are located hidden in the trunk..and are about the size of a half pack of cigarettes.. see if you can get a schematic to help locate the boosters .
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.
If you have window tint that contains metal sputter in it. That can cause interference on your fm/am signal strength. If that's the case change your tint to a carbon fiber tint that does not cause interfernce with your radio
Many cars with internal antennas do get this problem from corrosion setting into the ground connection outside the vehicle. The best solution for this is to purchase a new external antanna assembly with a mast and have it installed which will greatly improve your reception far better than when it was new
This is normally due to a broken antenna mast inside the motor, the mast /cable assembly should be replaced, the antenna motor has to be removed from the car and disassembled to remove the broken piece of the old cable, once that is accomplished the antenna motor is reinstalled and the new cable assembly is fed into the motor by turning the radio on until the motor stops and then turning the radio off while feeding the new mast in.
You may have an intermittent switch or possibly a shorted or broken wire. As for the radio, I'd yank it and put an after market deck in. GM radios aren't known for their quality. But, you could check the back of the radio to see if the antenna lead is plugged in securely. Hope this helps.