OK so the manual can be ignored, obviolusy you've taken the time to make sure you have an empty space waiting for a TV module and not a faulty module.

61120144096 is the TV retrofit harness number. It's jumped from £35 to £72 at cooperbmwparts in the last year. You may find Schmiedmann - Styling/Tuning/Spare parts for BMW - New parts has it at the old price, but shipping tax at 25% is an issue.

A used TV module will be about the same again. So £140 and then a few MQS pins to make an AV in. Note the AV in is mono.