Buick Regal: Bluetooth Malfunction (with IO5/IO6)

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 provide an overview of each diagnostic category.

Circuit/System Description

Bluetooth  wireless technology is a short-range communications technology intended to replace the cables connecting portable and/or fixed devices while maintaining high levels of security. The operating range of the signal is approximately 30 feet.

The available features and functions are determined by the type of device and the software within the devices being used. For a feature or function to operate, it must be supported in both devices.

The Bluetooth  hardware is internal to the human machine interface control module. The human machine interface control module supports streaming of data (music, voice, information) from cellular phones and other mobile devices that support those features. The human machine interface control module is also capable of interfacing with cellular phones for hands-free features.

Refer to the vehicle owner's manual, supplements, and the device manufacturer's information for information on devices, control, operation. and pairing instructions.

Diagnostic Aids

• Verify the mobile device is properly configured for the feature being used. Refer to the device manufacturer's information.
• Verify the device has the latest software available. Refer to the device manufacturer's information.
• Verify the function/feature that is being used is supported by the mobile device.
• The device must be paired to the radio to use the available Bluetooth  feature (s). The pairing process must only be performed once for each device, unless that device's information is deleted.
• The system can store pairing information for multiple devices, but can only be actively connected to one at any given time.
• For features that require a cellular connection make sure to perform tests in an area where the customers device has a strong signal.
• The radio will return to the previous screen after a Bluetooth call has ended.

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.

Special Tools

EL-50334-20 Multi-Media Interface Tester (MIT)

Circuit/System Verification

1. Verify no DTCs are present.

• If any DTCs are present

Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

• Go to next step: If no DTCs are present

2. Verify the K74 Human Machine Interface Control Module calibrations are current.

• If the K74 Human Machine Interface Control Module calibrations are not current

Reprogram the K74 Human Machine Interface Control Module and re-evaluate the concern.

• Go to next step: If no update calibrations are available

NOTE: The MIT tool can be used to test either cellular phone or streaming audio functions. Refer to the tool instructions, and perform the appropriate test (s) related to the customers concern in the following steps.

3. Ignition ON, infotainment system ON.

4. Verify the infotainment system successfully pairs with the MIT tool.

• If the infotainment system does not successfully pair with the MIT tool.

1. Perform the 3 vehicle Factory Resets located in Setting>System>Return to Factory Settings.
2. Verify the infotainment system successfully pairs with the MIT tool.
   • If the infotainment system does not successfully pair with the MIT tool.

     Replace the K74 Human Machine Interface Control Module.

• Go to next step: If the infotainment system successfully pairs with the MIT tool.

5. Verify the infotainment system successfully completes the desired feature test using the MIT tool.

• If the feature test is successful but the audio is distorted.

Refer to Speaker Malfunction (UQ3 without NKC), Speaker Malfunction (UQ3 with NKC), Speaker Malfunction (UQA with IO5/IO6), or Speaker Malfunction (UQA without IO5/IO6).

• If the feature test is not successful

Replace the K74 Human Machine Interface Control Module.

• Go to next step: If the feature test is successful

6. Verify the customers device can be paired with the infotainment system.

• If the device can not be paired with the infotainment system.

Perform a reset on the device. Refer to device manufacture's information.

• Verify the customers device can be paired with the infotainment system.

If the device still will not pair inform the customer the issue is with the device.

• Go to next step: If the device successfully pairs with the infotainment system.

7. Verify audio can be heard while streaming from the device.

• If audio can not be heard while streaming.

Ensure the volume on the device is turned up to an adequate level.

• Go to next step: If audio can be heard while streaming.

8. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for human machine interface control module replacement, programming, and setup.

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