A4 V6-3.0L (AVK) (2004)
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Check spring contacts -arrows- for flux residue.
If flux residue is present:
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Replace amplifier module (Do Not attempt to clean spring contacts, or damage may result).
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Check spring contact pads -arrows- on rear window glass.
If flux residue is present:
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Apply a small amount of Stabilant-22A to a cotton swab and wipe clean the six contact pads.
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Install amplifier module.
Note:
Reconnect electrical connectors matching color-coding on amplifier module.
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Confirm AM reception has improved.
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Reinstall rear headliner trim.
If AM reception has not improved, additional diagnosis will be required.