Buick Regal: DTC B1265

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Refer to Diagnostic Procedure Instructions for an overview of each diagnostic category.

DTC Descriptor

DTC B1265

Entertainment System Remote Enable Circuit

For symptom byte information refer to Symptom Byte List.

Diagnostic Fault Information

1. all components requiring remote enable inoperative
2. components will not power off with infotainment system

Circuit/System Description

When the radio is on, a discrete 12 V signal is supplied on the entertainment remote enable circuit to the Active Noise Cancellation Module / Audio Amplifier. This signal is used to control the power state of the component.

Conditions for Running the DTC

• The radio is ON.
• The system voltage is 9 - 16 V

Conditions for Setting the DTC

• The radio detects an open, short to ground or short to voltage on the entertainment remote enable circuit.
• The above condition is present for greater than 250 mS.

Action Taken When the DTC Sets

• The radio implements a current limiting mode and disables the output on the entertainment remote enable circuit.
• All components connected on the entertainment remote enable circuit will be inoperative.

Conditions for Clearing the DTC

• The condition for setting the DTC no longer exists.
• After the ignition has been OFF for a sufficient amount of time to allow the radio to enter a low power/sleep state, the radio will re-enable the output on the following ignition cycle and the DTC will become history.
• A history DTC clears after 50 malfunction-free ignition cycles.

Diagnostic Aids

• This DTC may be stored as a history DTC without affecting the operation of the radio/infotainment systems.
• The radio's current limiting logic may not re-enable the output on the entertainment remote enable circuit until after the radio performs a full power - down. It may be necessary to wait 5 minutes between each test attempt with the key OFF and retained accessory power OFF.

Reference Information

Schematic Reference

Radio/Navigation System Wiring Schematics (IOB) , Radio/Navigation System Wiring Schematics (IOR) or Radio/Navigation System Wiring Schematics (IO5/IO6) , or Radio/Navigation System Wiring Schematics (IOS/IOT).

Connector End View Reference

Component Connector End View Index

Description and Operation

Radio/Audio System Description and Operation (IO6) , Radio/Audio System Description and Operation (IOB) , or Radio/Audio System Description and Operation (IOS/IOT/IOU).

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Testing

1. Ignition OFF, radio OFF. It may take up to 2 min for all vehicle systems to power down.

2. Disconnect the X1 harness connector at the K108 Active Noise Cancellation Module / T3 Audio Amplifier.

3. Test for less than 10 Ω between the ground circuit terminal 8 and ground.

• If 10 Ω or greater

1. Test for less than 2 Ω in the ground circuit end to end.
   • If 2 Ω or greater, repair the open/high resistance in the circuit.
   • If less than 2 Ω, repair the open/high resistance in the ground connection.

• Go to next step: If less than 10 Ω

4. Ignition ON, A11 Radio ON.

5. Verify that a test lamp illuminates between the control circuit terminal 3 and ground.

• If test lamp does not illuminate

1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
2. Test for infinite resistance between the control circuit and ground.
   • If less than infinite resistance, repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
3. Test for less than 2 Ω in the control circuit end to end.
   • If 2 Ω or greater, repair the open/high resistance in the circuit.
   • If less than 2 Ω, replace the A11 Radio.

• Go to next step: If test lamp illuminates

6. Ignition OFF, radio OFF. It may take up to 2 min for all vehicle systems to power down.

7. Test for less than 1 V between the control circuit terminal 3 and ground.

• If 1 V or greater

1. Disconnect the harness connector at the A11 Radio, ignition ON.
2. Test for less than 1 V between the control circuit and ground.
   • If greater than 1 V, repair the short to voltage on the circuit.
   • If less than 1 V, replace the A11 Radio.

• Go to next step: If less than 1 V

8. Test or replace the K108 Active Noise Cancellation Module / T3 Audio Amplifier.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for radio and active noise cancellation module replacement, programming, and setup.

DTC B126A

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Refer to Diagnostic Procedure Instructions for an overview of each diagnostic category.

DTC Descriptor

DTC B126A 00

Internet Application Download Performance.

Symptom Byte List

Circuit/System Description

The term application refers to any piece of software that works on a system (hardware) that is being operated by its own software. Applications are typically small software programs which uses the hardware to perform a specific task, as opposed to operating the entire system. Applications can be initiated by the user or the Auto Start feature.

Conditions for Running the DTC

This DTC test runs during active Internet applications.

Conditions for Setting the DTC

The HMI Module has detected 3 consecutive resets of an Internet application.

Action Taken When the DTC Sets

The HMI Module prevents the Internet Application Auto Start feature

Conditions for Clearing the DTC

The DTC will clear when the fault is no longer present.

Diagnostic Aids

This DTC indicates an issue with the Internet Application and not the HMI Module.

Reference Information

Description and Operation

Radio/Audio System Description and Operation (IO6) , Radio/Audio System Description and Operation (IOB) , or Radio/Audio System Description and Operation (IOS/IOT/IOU).

Connector End View Reference

Component Connector End View Index

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, A11 Radio ON.

2. Verify DTC B126A is not set.

• If DTC B126A is set

Delete all applications loaded on the radio and reinstall.

• Go to next step: If DTC B126A is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Radio replacement, programming, and setup.

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