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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 119 (Active Noise Cancellation System) >> Diagnostic Information and Procedures >> DTC B126F, B1277, B127C, or B127D (without IOR) >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to:Active Noise Cancellation Description and Operation 

Circuit Description
Microphone (+) Signal The control module input circuit has an internal resistance connected to 8 V.
Microphone (-) Low Reference Grounded through the control module.
Component Description
B77LF Radio Volume Compensator Interior Noise Microphone - Left Front Each of the speaker output [+] and [-] circuits has a DC bias voltage that is approximately one half of the battery voltage. When using a DMM, each of the circuits will measure approximately 6.5 V DC to ground. The audio being played is produced by a varying AC voltage that is centered around the DC bias voltage. The AC voltage causes the speaker cone to move and produce sound.
B77RF Radio Volume Compensator Interior Noise Microphone - Right Front Each of the speaker output [+] and [-] circuits has a DC bias voltage that is approximately one half of the battery voltage. When using a DMM, each of the circuits will measure approximately 6.5 V DC to ground. The audio being played is produced by a varying AC voltage that is centered around the DC bias voltage. The AC voltage causes the speaker cone to move and produce sound.
B77R Radio Volume Compensator Interior Noise Microphone - Rear Each of the speaker output [+] and [-] circuits has a DC bias voltage that is approximately one half of the battery voltage. When using a DMM, each of the circuits will measure approximately 6.5 V DC to ground. The audio being played is produced by a varying AC voltage that is centered around the DC bias voltage. The AC voltage causes the speaker cone to move and produce sound.
K108 Active Noise Cancellation Module The active noise cancellation system uses microphones and the vehicle speakers to acoustically cancel out certain unpleasent frequencies.
T3 Audio Amplifier The Audio Amplifier receives audio inputs which it then outputs as amplified signals to the appropriate speakers.
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