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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 366 (Active Noise Cancellation System) >> Diagnostic Information and Procedures >> DTC B1277, B127C, or B127D >> Conditions for Running the DTC

Conditions for Running the DTC

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The amplifier performs a self diagnostic of the microphone circuits 16 seconds after initial power up, then periodically every 400 milliseconds thereafter.

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