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Home >> GMC >> 2018 >> Terrain SL >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures >> Diagnostic Information And Procedures >> DTC B127E: Front Video Display Output Signal (IO5/IO6 Without MAH/MBC) >> 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 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.

    • Go to next step: If the P17 Info Display Module does not display an image. 
  5. Vehicle OFF/Ignition OFF.
  6. Disconnect the LVDS interface cable from the P17 Info Display Module X2.
  7. Connect the EL-50334-2 Type A female to Mini B male USB Cable to the P17 Info Display Module X2. Connect the EL-50334-14 Infotainment Test Cable to the adapter.
  8. Disconnect the LVDS interface cable from the K74 Human Machine Interface Control Module X5. Connect the EL-50334-14 Infotainment Test cable to the K74 Human Machine Interface Module X5.
  9. Ignition ON/Vehicle in Service Mode, infotainment system ON.
  10. 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.
    • Go to next step: If the P17 Info Display Module displays an image. 
  11. Replace the vehicle LVDS interface cable from the P17 Info Display Module X2 to the K74 Human Machine Interface Module X5.
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