LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 11 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Bluetooth Malfunction >> Circuit/System Verification
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Verification

WARNING: This page is about a different car, the 2018 Buick Envision. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify no DTCs are present.
    • 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 
    3. 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.
    • 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.
scientia non olet · About LEMON Manuals