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Originally Posted by mdrush
It's the Db noise sensor for the Radio SVC (Speed Volume Control). You should have a seeting on your radio that enables that sensor to read the cabin noise level and increase/decrease the radio level accordingly. If it's functioning you should notice that the radio/CD volume increases slighlty as you accelerate to highway speeds and decreases as you slow down.
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Never saw those in the blazer before... What he is describing is more likely the cabin air filter...