Circuit/System Verification

WARNING: This page is about a different car, the 2016 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.

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.
- If DTC B124B is not set.
Ignition On/Vehicle in Service Mode. 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
  Refer to Circuit/System Testing
- If audio is heard from test tool
Verify the infotainment system can be switched to AUX as the audio source with the EL-50334-20 Multi-Media Interface Tester (MIT) connected to the auxiliary audio input jack.
- If the infotainment system can not be switched to AUX as the audio source
  Refer to Circuit/System Testing
- If the infotainment system can be switched to AUX as the audio source
Verify the audio from the EL-50334-20 Multi-Meida Interface Tester (MIT) is heard through the vehicle infotainment system while operating the test tool to begin audio playback.
- If audio is not heard from the test tool.
  Refer to Circuit/System Testing
- If audio is heard from the test tool.
All OK