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Discussion Starter #1
My HU has power because the lights come on. But the screen is black. And when I hook up the factory unit there is no problem. Is it something internal with the HU or my wiring?
 

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You're going to need to give us a little more info than that. What harness did you use? What head unit? What mode of Passat?
 

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Discussion Starter #3
I have a 2003 Volkswagen passat. Kenwood ddx 374bt head unit. And I've tried the scosche harness and I also have the pac rp4 vw11 harness and neither one works. I think its something internal. But I figured I'd get some other opinions
 

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It should work just fine if you verify you have a good ground, 12v constant on the yellow wire and 12v switched on the red wire. You have a bad head unit.


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