V40 L4-1.9L Turbo VIN 29 B4204T3 (2002)
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Ignition off
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Reinstall the connectors, components etc.
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Ignition on
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Turn the light switch to the half strength setting.
Check that the lighting for the audio unit is working and that the luminance can be controlled with the rheostat control.
The fault has been remedied if the function is OK.