Kia Sedona Electrics, ECU, Warnings & Lights Problems

ive just bought the kia and cant workout how to get the tv dvd to work ive flicked the switch on the dash it lights up blue but thats it.

Hi all , can anyone help me in finding the loom for the towbar wiring. were do i patch it into? and where do i go through the ody to get the the loom? thanks