Walk through the steps of the initial set up, being certain the frequency, interference eliminator code and Qt filter match one another. If any one of these three does not match, the radios will not work together. The Qt filter can be problematic, you might want to set it to zero.
Here is a link to the user guide:
http://www.giantintl.com/ContentManage/manuals/Moto/FV500_CFR_final.pdf
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