Buick Regal: Active Noise Cancellation

SCHEMATIC AND WIRING DIAGRAMS

ACTIVE NOISE CANCELLATION WIRING SCHEMATICS

Active Noise Cancellation (UQ3)

Active Noise Cancellation (UQA)

Diagnostic Information and Procedures

DTC B0560

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC B0560

Tachometer Circuit

Symptom Byte Information: Symptom Byte List.

Diagnostic Fault Information

Circuit/System Description

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

Conditions for Running the DTC

• Ignition - On / Vehicle - In Service Mode
• Battery Voltage = 9 to 16 V

Conditions for Setting the DTC

• Engine Running
• Engine Speed Signal Performance = Less than 300 RPM - Greater than 9000 RPM

Actions Taken When the DTC Sets

Active Noise Cancellation - Disabled

Conditions for Clearing the DTC

Greater than 300 RPM & Less than 9000 RPM

Reference Information

Schematic Reference

Active Noise Cancellation Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEW INDEX

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions.

Circuit/System Testing

1. Ignition/Vehicle & All vehicle systems - Off.

2. Disconnect the electrical connector: X3@K108 Active Noise Cancellation Module/T3 Audio Amplifier.

3. Engine Running@600 RPM.

4. Test for 575 to 800 Hz between the test points: Signal circuit terminal 2 & Ground.

• If not between 575 and 800 Hz

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the appropriate electrical connector: @K20 Engine Control Module
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 2 & Ground
   • If 1 V or greater - Repair the short to voltage on the circuit.
   • Go to next step: If less than 1 V
5. Ignition/Vehicle & All vehicle systems - Off
6. Test for infinite resistance between the test points: Signal circuit terminal 2 & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
7. Test for less than 2 ohms between the test points: Signal circuit terminal 2 & The other end of the circuit
   • If 2 ohms or greater - Repair the open/high resistance in the circuit.
   • If less than 2 ohms - Replace the component: K20 Engine Control Module

• Go to next step: If between 575 and 800 Hz

5. Test or replace the component: K108 Active Noise Cancellation Module/T3 Audio Amplifier.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification.

For control module replacement, programming, and setup refer to: Control Module References.

DTC B1277, B127C, B127D, or B126F

Diagnostic Instructions

• Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions

DTC Descriptor

DTC B1277

Microphone 1 Input Signal Circuit

DTC B127C

Microphone 2 Input Signal Circuit

DTC B127D

Microphone 3 Input Signal Circuit

Symptom Byte Information: Symptom Byte List.

Diagnostic Fault Information

Circuit/System Description

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

Conditions for Running the DTC

Ignition - On / Vehicle - In Service Mode

Battery Voltage = 9.5 to 15.5 V

Conditions for Setting the DTC

B1277 01, B127C 01, B127D 01

The control module detects a short to voltage. - Microphone (+) Signal/Microphone (-) Low Reference

B1277 02, B127C 02, B127D 02

The control module detects a short to ground. - Microphone (+) Signal/Microphone (-) Low Reference

B1277 04, B127C 04, B127D 04

The control module detects an open circuit. - Microphone (+) Signal/Microphone (-) Low Reference

The control module detects an open circuit. - Microphone (+) Signal/Microphone (-) Low Reference

B1277 1A, B127C 1A, B127D 1A

Voltage Out of Range - Microphone (+) Signal/Microphone (-) Low Reference

Actions Taken When the DTC Sets

Active Noise Cancellation - Disabled

Conditions for Clearing the DTC

The conditions for setting the DTC no longer exist.

A history DTC will clear after 50 consecutive malfunction-free ignition cycles.

Reference Information

Schematic Reference

Active Noise Cancellation Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEW INDEX

Component View Reference

Active Noise Cancellation Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References

Circuit/System Testing

1. Ignition/Vehicle & All vehicle systems - Off.

2. Disconnect the appropriate electrical connector: @B77 Radio Volume Compensator Interior Noise Microphone.

3. Ignition - On / Vehicle - In Service Mode.

4. Test for 7.8 to 8.8 V between the test points: Signal circuit terminal 2 & Ground.

• If less than 7.8 V

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: X3@K108 Active Noise Cancellation Module/T3 Audio Amplifier
3. Test for infinite resistance between the test points: Signal circuit terminal 2 & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
4. Test for less than 2 ohms between the test points: Signal circuit terminal 2 & The other end of the circuit
   • If 2 ohms or greater - Repair the open/high resistance in the circuit.
   • If less than 2 ohms - Replace the component: K108 Active Noise Cancellation
   • Module/T3 Audio Amplifier

• If greater than 8.8 V

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: X3@K108 Active Noise Cancellation Module/T3 Audio Amplifier
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Signal circuit terminal 2 & Ground
   • If 1 V or greater - Repair the short to voltage on the circuit.
   • If less than 1 V - Replace the component: K108 Active Noise Cancellation Module/T3 Audio Amplifier

• Go to next step: If between 7.8 and 8.8 V

5. Test for less than 1 V between the test points: Low Reference circuit terminal 1 & Ground

• If greater than 1 V

1. Ignition/Vehicle & All vehicle systems - Off
2. Disconnect the electrical connector: X3@K108 Active Noise Cancellation Module/T3 Audio Amplifier
3. Ignition - On / Vehicle - In Service Mode
4. Test for less than 1 V between the test points: Low Reference circuit terminal 1 & Ground
5. If 1 V or greater - Repair the short to voltage on the circuit.
6. If less than 1 V - Replace the component: K108 Active Noise Cancellation Module/T3 Audio Amplifier

• Go to next step: If less than 1 V

6. Ignition/Vehicle & All vehicle systems - Off.

7. Disconnect the electrical connector: X3@K108 Active Noise Cancellation Module/T3 Audio Amplifier.

8. Test for infinite resistance between the test points: Low Reference circuit terminal 1 & Ground.

• If less than infinite resistance

Repair the short to ground on the circuit.

• Go to next step: If infinite resistance

9. Test for less than 2 ohms between the test points: Low Reference circuit terminal 1 & The other end of the circuit

• If 2 ohms or greater

Repair the open/high resistance in the circuit.

• Go to next step: If less than 2 ohms

Go to next step: Replace the appropriate component: B77 Radio Volume Compensator Interior Noise Microphone

10. Ignition - On / Vehicle - In Service Mode.

11. Verify that no DTC listed in the DTC Descriptor Category is set.

• If a related DTC is set

Replace the component: K108 Active Noise Cancellation Module/T3 Audio Amplifier

• Go to next step: If a DTC was not set

12. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification

• Active Noise Cancellation Microphone Replacement
• For control module replacement, programming, and setup refer to: Control Module References

Repair Instructions

ACTIVE NOISE CANCELLATION MODULE REPLACEMENT

Preliminary Procedure

Rear Compartment Side Trim Replacement - Right Side (Hatchback) Rear Compartment Side Trim Replacement - Right Side (5-Door Wagon 35).

1. Active Noise Cancellation Module Nut [3x]
   CAUTION: Fastener Caution.
   Tighten 6N.m (53 lb in)
2. Active Noise Cancellation Module
   Procedure
   1. Disconnect the electrical connectors.
   2. Control Module References - Programming and Setup

DESCRIPTION AND OPERATION

ACTIVE NOISE CANCELLATION DESCRIPTION AND OPERATION

The entertainment system on this vehicle may have several different configurations. To determine the specific configuration of the vehicle, please see the Service Parts ID Label, and refer to RPO Code List.

T3 T3 - Audio Amplifier
B77LF - B77LF Radio Volume Compensator Interior Noise Microphone - Left Front
B77RF - B77RF Radio Volume Compensator Interior Noise Microphone - Right Front
B77R - B77R Radio Volume Compensator Interior Noise Microphone - Rear
K20 - K20 Engine Control Module

The main components of the Active Noise Cancellation system are:

• 3 microphones in the vehicle headliner.
• A discrete engine speed (RPM) signal from the engine control module to the amplifier
• Active Noise Cancellation electronics and software integrated into the audio amplifier
• The vehicle speaker system, connected to the amplifier, to output the desired cancellation frequencies

The Active Noise Cancellation system is operational under the following conditions:

• The amplifier has passed all self diagnostic checks
• All doors are closed
• Battery voltage is between 9.5 V and 16 V
• The vehicle cabin temperature is less than 140ºF (60ºC)
• Engine speed is between 550 and 3000 RPM

The Active Noise Cancellation system is a method used to reduce the perception of certain undesirable sounds generated by the engine into the vehicle cabin. The systems uses microphone and engine speed signals, software integrated into the amplifier, and the vehicle speakers to determine and generate the correct frequencies needed to achieve the desired reduction.

Three microphones are located in the headliner to monitor noise/sounds in the vehicle cabin, and are directly connected to the amplifier. The amplifier also receives a discrete engine speed (RPM) signal from the engine control module. The amplifier processes these inputs to determine the frequency of the undesirable sound. The amplifier then calculates the appropriate cancellation frequency and outputs a cancellation signal (audio tone) to the vehicle speakers to reduce the perception of undesirable sounds by the vehicle occupants so the vehicle cabin appears quieter and without vibration.

ESE Engine Sound Enhancement (if equipped with NKD)

The ESE feature improves the natural sounds of powertrain and exhaust systems. It uses the microphones and tachometer inputs (under heavy acceleration conditions) to modify the sound and play it back through the speakers. This feature is always enabled and there are no controls to enable or disable the system.

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