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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 B127E: Front Video Display Output Signal >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF.
  2. Verify the LVDS interface cable is properly connected at the P17 Info Display Module X2 and the K74 Human Machine Interface Control Module X5 connections and there is no damage to the cable or connections.
  3. Ignition On/Vehicle in Service Mode. Infotainment system ON.
  4. Verify the P17 Info Display Module does not display an image.
    • If the P17 Info Display Module displays an image. 

      All OK.

    • If the P17 Info Display Module does not display an image. 
  5. Ignition OFF.
  6. Replace the video interface cable.
  7. Ignition On/Vehicle in Service Mode. Infotainment system ON.
  8. Verify the P17 Info Display Module displays an image.
    • If the P17 Info Display Module does not display an image 
    1. Replace the P17 Info Display Module. Connect all harness connectors.
    2. Ignition On/Vehicle in Service Mode. Infotainment system ON.
    3. Verify the P17 Info Display Module displays an image.
      • If the P17 Info Display Module still does not display an image, replace the K74 Human Machine Interface Control Module.
      • If the P17 Info Display Module displays an image.
    4. All OK.
    • If the P17 Info Display Module displays an image. 
  9. All OK.
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