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This is a duplicate post from the s4 forum as I don't seem to be having much luck getting a response there!

I've got a 2003 B6 S4 avant. In the boot on the right is what looks like the bose sub and a box (amp) with (from what I can tell) a 25 pin connection. On the left side is a sealed box with no visible connections (what is that?).

I thought I would find the tv tuner easily but am now confused as to which it is and where it is - if anyone could help that would be appreciated!

Thanks

If you have a TV tuner it will be on the left behind that panel. The module should be black with a fnd grill at one side, about the size of a CD changer and uses the same removal tools.

Try removing the module with stereo removal keys and the 54 pin is on the rear of the tuner. Sometimes the tuner will not come out and some trim removal is neccessary.