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Home >> Cadillac >> 2015 >> XTS Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> DTC B127A: Auxiliary Video Input Signal Circuit Open Circuit >> Circuit/System Verification
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Circuit/System Verification

  1. Verify DTC B127A 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 B127A is set. 

      Refer to Circuit/System Testing.

    • If DTC B127A is not set. 
  2. Ignition ON, rear seat entertainment system ON.
  3. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the rear seat entertainment system USB port and select the USB test mode.
  4. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the rear seat entertainment system while operating the system to play audio from the test tool.
    • If audio is not heard from the test tool 
    1. Insert an SD card with compatible media into the SD card slot.
    2. 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 X82 Audio/Video Input Adapter.
    • If audio is heard from the test tool 
  5. Insert an SD card with compatible media into the SD card slot.
  6. 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 
  7. All OK.
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