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Home >> Cadillac >> 2017 >> CTS V >> 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 B127E (IOS/IOT): Front Video Display Output Signal >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle OFF/Ignition OFF.
  2. Verify the LVDS interface cable is properly connected at the P17 Info Display Module X2 and the A11 Radio X3 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 displays an image.
    • If the P17 Info Display Module does not display an image. 
  5. Vehicle OFF/Ignition OFF.
  6. Replace LVDS interface cable from the P17 Info Display Module X2 to the A11 Radio X3.
  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.
  9. Vehicle OFF/Ignition OFF.
  10. Replace the P17 Info Display Module. Connect all harness connectors.
  11. Ignition ON/Vehicle in Service Mode, infotainment system ON.
  12. Verify the P17 Info Display Module displays an image.
    • If the P17 Info Display Module does not display an image.

      Replace A11 Radio.

    • If the P17 Info Display Module displays an image. 
  13. All OK.