Elgrand E51 - Bluetooth (aux input) installation via TV tuner

Tuner adapter cable available on Amazon Japan: https://www.amazon.co.jp/dp/B0199P8ZCG The Facebook thread where I saw that cable mentioned:   / 1558163567550372   For those Elgrands not specced with an RCA input by the rear seats, it seems there's a spare socket on the TV tuner that you can use to get an auxiliary input to the OEM stereo. This video describes the process. Note that doing this obviously relies on the TV not turning off when you drive. Mine stays on while driving but I understand this isn't the standard behaviour, so it seems someone may have fitted a bypass at some point. (Although if they did, I have no idea where it is!)