Sounds like yours acc (red wire) is not connected
What type of vehicle did you install this into? I can get you the wiring information if necessary. Make sure you are measuring 12V on your yellow (constant) power wire and 12V on your red (accessory) wire as well. Be sure to have a good ground as well. If these wires check out ok, check that the fuse (10amp below the radio harnesses plug) is good. Beyond this, you may have a bad unit. Hope this was helpful.
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