There has been some discussion of this subject already on this thread Television Tuner - original Dresden installation in Phaeton, but because that discussion kind of veered off into discussion of aftermarket parts, I thought it would be a good idea to start a new thread about a retrofit of an OEM VW TV tuner in a Phaeton. I am now about halfway through retrofitting an OEM VW TV tuner to my North American Phaeton.
There are four components that need to be replaced or modified to do this job:
1) You need a ROW specification J523 Front Information Display and Control Head that has a button on it marked 'TV'.
2) You need a slightly different antenna controller for the rear window.
3) You need the TV Tuner itself
4) You need to run a wiring harness from the tuner to the J523 to supply the video signal.
I obtained and installed a ROW specification J523 in my NAR Phaeton. This was a pretty trouble-free and simple modification - just remove the NAR specification J523 and install the ROW specification one. Recoding will be needed, but that's not difficult to do, it can be accomplished with either a VAS 5052 or a VAG-COM, both of which provide guided prompts. The only downside of installing a ROW spec J523 in a North American car is that you lose most AM radio reception, due to the change to 9kHz channel spacing (the European standard) from 10 kHz channel spacing (the North American standard). More information about the J523 changeout can be found on this thread: Nav Acceptance Screen - discussion about disabling it or working around it.
I obtained an antenna amplifier (aerial amplifier) that was suitable for a car that has a TV tuner installed. There are quite a few variations of the antenna amplifier (part number 3D0 035 225), depending on whether the Phaeton has a parking heater (stand-heating), a TV tuner, or just a basic AM-FM radio. Full details can be found in the Phaeton parts catalog, section 0 (Extras), illustration 35-10. It is quite easy to remove the existing antenna amplifier and install the new one, although you do have to lower the rear part of the headliner to do this, which is a pain.
Fitting the TV tuner itself (part number 3D0 919 146 for the analog-only tuner) is quite simple. You just lower the cover of the electronics compartment below the hatshelf, and install the tuner - the fittings to hold it are already there.
I still need to obtain the additional wiring harness that conveys the TV signal from the tuner to the J523 and install that.
Below are a few photos that illustrate some of the components.
Antenna Control Module with TV Tuner function (PN suffix AJ or AT)
R78 TV Tuner (Controller 57)