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I am sorry that you have not been helped yet. I just came online and saw your question.
Possibilities range from a damaged/broken/disconnected fm antenna or internal fault on fm circuitry .
If you are wanting to diagnose and repair yourself, you are limited to checking the antenna only. It requires an oscilloscope and other specialized equipment to test the circuitry of the unit itself, which typically run around $20K and just not feasible to do at home, both from a practical and financial standpoint.
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Ok, since you actually do get FM but the volume is erratic, then it is definitely internal to the unit and your choices will be either send out for repair, replace with another factory unit, or go aftermarket
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