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Home >> GMC >> 2019 >> Terrain SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 137 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC B124B (IOB) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2018 GMC Terrain and 2018 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Auxiliary Audio Input Jack

  1. Verify no DTCs are present.
    • Go to next step: If no DTCs are present 
  2. Ignition ON/vehicle in Service Mode, radio ON.
  3. Verify the infotainment system switches 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 does not switch to AUX as the audio source 

      Refer to Circuit/System Testing - Auxiliary Input Jack.

    • Go to next step: If the infotainment system switches to AUX as the audio source 
  4. Verify the audio from the EL-50334-20  Multi-Media 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 - Auxiliary Input Jack.

    • Go to next step: If audio is heard from the test tool. 
  5. All OK

USB Port

  1. Verify no DTCs are present.
    • Go to next step: If no DTCs are present 
  2. Ignition ON/vehicle in Service Mode, radio ON.
  3. Verify the infotainment system switches to USB as the audio source with the EL-50334-20  Multi-Media Interface Tester (MIT) connected to the USB port.
    • If the infotainment system does not switch to USB as the audio source 

      Refer to Circuit/System Testing - USB Port.

    • Go to next step: If the infotainment system switches to USB as the audio source 
  4. Verify the audio from the EL-50334-20  Multi-Media Interface Tester (MIT) is heard through the vehicle 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 - USB Port.

    • Go to next step: If audio is heard from the device 
  5. All OK.
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