A3 Quattro V6-3.2L (BUB) (2008)
Cellular Phone Microphone: Testing and Inspection
Inside Microphone, Bose, Checking
Audi A3 with " Symphony II BOSE (R) " radio system use Inside Microphone R74 integrated with the front interior lamp module. The microphone is
connected directly to Amplifier R12 .
Amplifier R12 then adjusts the BOSE (R) sound settings according to changing interior noises. When noise increases in the interior, the amplifier
automatically adjusts the volume according to the sound pattern.
The interior noises are minimized and the sound quality increases.
When the radio is switched on, the Amplifier R12 checks the voltage supply level of Inside Microphone R74 . If the result is OK, there is no reaction.
If the microphone is not installed, or if there is an open/short circuit, three short tones are emitted three times.
Inside Microphone R74 , checking:
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Switch on radio and tune to clear, strong station.
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Set volume level to approximately "20".
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Tap lightly on front interior lamp module.
Radio volume should increase. Process occurs slowly.
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Stop tapping.
Radio volume should decrease. Process occurs slowly