Or the parking prake wire is not grounded... that's what happened to me. Just find a spot to ground the parking brake wire and video should appear.
Ya press or pull the emergency break and try that..
If you press the v.sec button a couple of times the video should show up on the unit
It sounds like the video cable is disconnected, or perhaps if the unit has multiple inputs, it' s set for the wrong one.
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I have the same problem and have tried changing the vieo selections as well?? totally frustrated.
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