noonedoes

Hello All, I bought a F700bt and will be installing it this weekend. I got it used and it didn't come with the RCA harness. I don't plan on hooking anything video to the rca harness, but I would like to be able to watch videos off the sd card or my ipod (connecting it using the AUX2-front port with the CD-RM10 cable)....since I don't have the RCA harness does anyone know if the video play back will still work while the car is motion if I just ground the parking brake wire (green wire)?