Sounds like the 2 wires that plug into the radio module have not been done.

Check the following:

On the blue plug (on the mk4) pin 9 (nav audio out +) and pin18 (nav audio out -), should go to the TV modules white plug on pins 3 (nav audio in +) and pin 12 (nav audio in -).

From here they go into the radio module (one of the smaller blocks in the big radio plug).

bm54 (flat pin), 12 pin white plug (I think) pin 10 (nav/tv audio right), pin 12 (nav/tv audio letf) and pin 12 (nav/tv audio gnd).

Also check the black 12 pin plug pin 5 (nav/tv audio +) and pin 11 (nav/tv audio -)

Are you getting sound from the TV?

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.