Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Verification
2019 Buick Envision BaseSECTION Circuit/System Verification
- Verify DTC B124B is not set. Since occurrences of this DTC can be caused by an incompatible or faulty USB device, review with the customer the conditions under which their concern occurred.
- If DTC B124B is set.
Refer to Circuit/System Testing.
- Go to next step: If DTC B124B is not set.
- If DTC B124B is set.
- Ignition ON, infotainment system ON.
- Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X83 Auxiliary Audio Input USB port and select the USB test mode.
- Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
- If audio is not heard from the test tool
- Insert an SD card with compatible media into the SD card slot.
- Verify the media on the SD card can be accessed while operating the system to connect to the SD card.
- If the SD card reader cannot be accessed, refer to Circuit/System Testing.
- If the SD card reader can be accessed, replace the X83 Auxiliary Audio Input.
- Go to next step: If audio is heard from the test tool
- Insert an SD card with compatible media into the SD card slot.
- Verify the media on the SD card can be accessed while operating the system to connect to the SD card.
- If the SD card reader media cannot be accessed
Refer to Circuit/System Testing
- Go to next step: If the SD card reader media can be accessed
- If the SD card reader media cannot be accessed
- All OK.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.