Bypassing Green Parking Sensor Wire

Most Video units/screens have those as a safty feature, i believe shops ( by law) have to hook those up if the lcd is in the frnt of the car/truck. In most cases its either a 12v+ or a ground and the parking brake itself is the switch. just find out what the wire's input needs to be either hot or ground( from the diagram it apears to be a 12v+) and hook it up so its constant. you could put it on a switch if you wanted as a extra means of power control or safety.  what ever that wire requires, either positive or ground, just hook it up to one of those as a constant, bypassing the parking brake ( as a switch).  To be honest, im not sure if different vehicles have different parking sensor wire polarities, in this case it really dosnt matter.

I forgot that in my last post you were bypassing the parking brake. my bad. it does appear that it requires a 12v positive. usuially its a ground in most cars, so i guess a relay would be needed to reverse the polarity... anyway,  ide double check with kenwood, ask if that wire requires a positive or negative parking sensor wire. if they say positive, just hook it up to a 12 volt accessory in the car. if they say ground then just ground it.

I'm using this http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=071-580&ctab=5&#ctabanc to power my lcd and player.  Is this power source the same thing as a +12v accessory?  I'm a newbie here... this doesn't make any sense... positive 12 on the red and postive 12 on the green?

I also don't get the parking break circuit whatever.  How does it creat a switch and how/why would a parking break have power?