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It's late here but I'll try to see what's up. I just installed the 4200nex about 2 weeks ago and added all the goodies to mine. Why are you thinking the parking brake line is grounding? The unit should still come on even with the parking brake wire not connect I think. All that wire should do is lock u out of any video features. You need to check the actual ground coming out of the harness. I know nobody uses wire nuts on car wire but they can be very useful to test connections.
One more thing. When testing the unit test in accessory mode. If the unit doesn't come up when the car turn on give it at least a minute because it will black screen sometimes and takes a good minute for the unit to actually turn on
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