hey, well I did fix the radio issue a long time ago and forgot to add the note to this. I had two problems with the radio, sometimes it didn't initialize when resuming from hibernate.. and the poor radio reception. I fixed the first problem , the radio was not powered by the PSU, i had it feeding off of the cars power from the original stock harness.. the reception issue was fixed when I turned on the stock radio amplifier.. I didn't connect the wire for that at all..now all works good. Reception is still an issue but i think that has to do with Nissan and the way the designed the antenna system..
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I have both of the issues you mentioned. So you are running the tuner power from the PSU? I have an M3-ATX, how'd you do that? Also, by "turned on the stock amplifier" do you mean the audio amp or antenna amp? If the latter, how'd you do that?
the easiest way to power the HD radio is just tapping a molex connector from the m3atx unit. Yellow is usually 12 volts so, connect a wire to that and connect it to both the red and yellow wire from the radio unit. you can either ground the radio on the car body or run another wire from the (black wire) molex connector.
The amplifier I'm referring to is the radio antenna amplifier thats built into the car. Just locate the radio turn on wire on the stock radio wire harness and then just use a short piece of wire to give it a switched 12 volt power and that should be it.. search the internet for the radio wire diagram for your car to get the wire color...