Wrong! It connects directly via a bus cable for the Pioneer nav. You obviously don't know your product, and the aux video in, will not be engaged without the handbrake, which as I've said before, has to be pumped twice in order to switch on the video viewing mode. Furthermore, the Pioneer Nav, will completetly disable the video display, except for nav and menu's for tuner, cd, etc... once it senses the car moving. Back in the days....last year with the N1, and all other A/V receivers...grounding the wire would've been fine, but now, as with the Alpine's, simply grounding won't work. Please read my posts more carefully so I don't have to repeat myself.
The point is that it's not as easy as you make it sound. It's not hard, but don't provide false information about how to do things, such as grounding it. I've explained why simply grounding won't work. Take the time to read my responses before answering. I'm not saying that he can't simply add a switch to make it work. Nor that it's unbelievably difficult to go either route. I honestly could care less whether and how he/she by-passes the viewing mode, but the method you proposed, doesn't even work....period....!!! I've already explained why, so please don't ask. He has to connect to the parking brake wire, and add a mechanical rocker or togle switch that is spliced into the handbrake wire, and allows you to select ground, as well as the handbrake line charge I discussed earlier. Why do you think Pioneer has the parking/hand brake listed as a + connection instead of a ground? Regardless of which method you prefer, switch or rca loop, grounding is no longer an option on any 05 model A/V receivers from Pioneer.