Engine-Codes - Buick - B1277 Buick

B1277 Buick Code - Microphone 1 Input Signal Circuit

- Code Popularity: 632 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code B1277 Buick?

  • Faulty Radio Volume Compensator Interior Noise Microphone
  • Radio Volume Compensator Interior Noise Microphone harness is open or shorted
  • Radio Volume Compensator Interior Noise Microphone circuit poor electrical connection
  • Faulty Audio Amplifier

|How to Fix the B1277 Buick Code?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Code B1277 Buick Tech Notes

Installation of aftermarket replacement speakers, additional speakers/subwoofers, or aftermarket exhaust systems can cause undesirable behavior of the active noise cancellation system. The noise reduction microphones have foam blocks above them to seal the microphones and aid in the reduction of headliner vibration. Missing or out of place foam blocks can impact system performance.

|What is the Cost to Diagnose the Code B1277 Buick?

Labor: 1.0

The cost to diagnose the B1277 Buick code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code B1277 Buick Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What Does the B1277 Buick Code Mean?

The active noise cancellation system uses three microphones in the vehicle headliner: one above each front seating position, and one above the rear seat. The Audio Amplifier provides a bias voltage to each microphone (+) and (-) signal circuits for operation of the microphone. The microphones monitor the vehicle cabin for undesirable engine sounds. The Audio Amplifier uses the microphone inputs and an engine RPM signal to determine the frequency of the undesirable sound. The Audio Amplifier performs a self diagnostic of the microphone circuits 16 seconds after initial power up, then periodically every 400 milliseconds thereafter.

Microphone 1 Input Signal Circuit

|Need more Information on the B1277 Buick Code?

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|Need Help with the B1277 Buick Code?

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