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Thank you for your help question. My name is Steve and I am a fully qualified vehicle technician with over thirty years in the trade, hopefully I can help you. Its a nice choice of radio you have.
When fitting the SPH-DA230DAB radio to some vehicles, the terminals need to be reversed on the power leads, so that 1 connects to 4 and 2 connects to 3 I have attached an image to show this. This should ensure that the correct lead feed the power.
You should also check that the power leads from the vehicle do have a live feed, it may be the case that one of the fuses has blown during the fitting on the unit.
I hope this answers your question but do please feel free to ask me any further details.
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You can continue to use this thread to reply, I am about to send another image file, let me know if you can see this one ok.
Ok, have you checked the feed from the vehicle to ensure that you do have a live feed going in ok