Jetta L4-1.9L DSL Turbo (BEW) (2004)
Section 2 - Radio antenna system diagnosis through radio unit
Premium VI radios are capable of signal diagnosis through operating internal diagnostics of the radio unit.
All models except Touareg and Phaeton:
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Select AM or FM.
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Press and hold the mix button (black arrow).
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Screen will appear that shows "Service Test mode" (white arrow).
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Press mix button briefly.
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Test one indicates current antenna status, i.e. ON or OFF (arrow).
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Press mix button briefly again.