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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System And Navigation System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B1280: Rear Seat Entertainment Input Signal Circuit Signal Amplitude >> Circuit/System Testing >> One Screen Inoperative

One Screen Inoperative

  1. Ignition OFF.
  2. Disconnect the X1 harness connector at the inoperative P22 Video Display.
  3. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
    • If 10 Ω or greater. 
    1. 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. 
  4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate. 

      Repair the open/high resistance in the circuit

    • If the test lamp illuminates. 
  5. Ignition On/Vehicle in Service Mode. Rear seat entertainment system ON.
  6. Test for 5 V or greater between the control circuit terminal 2 and ground.
    • If less than 5 V. 
    1. Ignition OFF, disconnect the X1 harness connector at the A33 Media Disc Player.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the A33 Media Disc Player.
    • If 5 V or greater. 
  7. Ignition OFF.
  8. Verify the LVDS cable is properly connected at the P22 Video Display, A33 Media Disc Player and all in-line connectors 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. 
  9. Connect the X1 harness connector at the P22 Video Display.
  10. Disconnect the X2 harness connector at the operating P22 Video Display.
    NOTE: In the following steps, the test tools are used to create a jumper for the LVDS cable from the operating display to the inoperative display.
  11. Connect the EL-50334-4 Type A female to Mini B female Adapter to the harness of the operating P22 Video Display. Connect the EL-50334-14 Infotainment Test Cable to the adapter.
  12. Disconnect the X2 harness connector at the inoperative P22 Video Display. Connect the EL-50334-14 Infotainment Test Cable to the inoperative P22 Video Display.
  13. Ignition On/Vehicle in Service Mode. Rear seat entertainment system ON.
  14. Verify the P22 Video Display turns on.
    • If the P22 Video Display does not turn on. 

      Replace the P22 Video Display.

    • If the P22 Video Display turns on. 
  15. Disconnect the test cable and adapter from the harness of the operating P22 Video Display. Connect all harness connectors at operating P22 Video Display.
  16. Disconnect the X4 harness connector at the A33 Media Disc Player.
  17. Connect the EL-50334-12 Infotainment Test Cable - RSE to the A33 Media Disc Player. Connect the EL-50334-13 Infotainment Test Cable - RSE Splitter to the EL-50334-12 Infotainment Test Cable - RSE. Connect the EL-50334-14 Infotainment Test Cable and the EL-50334-2 Type A female to Mini B male USB Cable together. Connect the assembled test cables to the longer end of the EL-50334-13 Infotainment Test Cable - RSE Splitter and the inoperative P22 Video Display.
    NOTE: In the following steps, the test tools are assembled and used to bypass the vehicle LVDS cable assembly to determine if there is an output from the A33 Media Disc player on LVDS.
  18. Ignition On/Vehicle in Service Mode. Rear seat entertainment system ON.
  19. Verify the P22 Video Display does NOT turn ON.
    • If the P22 Video Display turns on. 

      Replace the appropriate LVDS cable.

    • If the P22 Video Display does not turn on. 
  20. Test or replace the A33 Media Disc Player.
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