I get a dvd gps from online autodvdgps store a wek ago,now i had been set up it yestoday?
the steps:

1.Unclench central control board panel first.
2.After take out original mainframe , you can see connection inside ( including AV, control cables ) .
3.Technician pack up wiring harness .
4.Take away mainframe and underlay a towel, to prevent shave . and install the original bracket to new mainframe .
5.Technician are installing camera ( optional ).
6.Back to inside car, position the well-set mainframe in front of panel, and make connection.
8.Confirm the connection is ok, put mainframe embed to central control board carefully.
9.Use screws to fixing mainframe.
10.Connect control cables for panel and install central control board back.
11.Fixing central control panel, adjust gaps around.
12.Fixing baffle back and connect lighter cables.
13.Connect power cable of back curtain.
14.Connect hot power cable of chair.
15.Fixing panel back to central control board.
16.All panel are ready now.

If you tend to do it by some car tools, so you dont pay money for professtional, di it by yourself!