Evening everyone I installed a double din touch screen radio kit in to my mates LR3 2006 disco S auto same kit I installed in to mine, all works no probs but he got a new disco 3 HSE with the upper display sat nav system, I swapped the radio over to his new landy all works but the sat nav system doesn't come on and theirs no sound can any one advise me on what I could do or if it's a simple re-wire.