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

  1. Ignition OFF, disconnect the X1 harness connector at the X82 Audio/Video Input Adapter.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 7 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the test lamp.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
    • If the test lamp illuminates 
  4. Verify the USB cable is properly connected at the X82 Audio/Video Input Adapter, A33 Media Disc Player and the console to I/P in-line connector, and there is no damage to the cable or connections.
    • If connection problems or cable damage is noted. 

      Perform the appropriate repair or replacement to correct any issues.

    • If no connection problems or cable damage is noted. 
  5. Replace the X82 Audio/Video Input Adapter. Connect all harness connectors.
  6. Ignition ON, rear seat entertainment system ON.
  7. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X82 Audio/Video Input Adapter USB port and select the USB test mode.
  8. 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. Replace the A33 Media Disc Player.
    2. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X82 Audio/Video Input Adapter USB port and select the USB test mode.
    3. 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, replace the USB cable connected to the X82 Audio/Video Input Adapter. Verify audio is heard from the test tool. If audio is not heard from the test tool, replace the USB cable connected to the A33 Media Disc Player.
      • If audio is heard from the test tool.
    4. All OK
    • If audio is heard from the test tool 
  9. All OK
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