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Home >> Buick >> 2016 >> Envision >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (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

WARNING: This page is about a different car, the 2016 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF/Ignition OFF.
  2. Verify the LVDS interface cable is properly connected at the P17 Info Display Module and the K74 Human Machine Interface Control Module 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. Vehicle OFF/Ignition OFF.
  6. Disconnect the LVDS interface cable from the P17 Info Display Module.
  7. Connect the EL-50334-2 Type A female to Mini B male USB Cable to the P17 Info Display Module. 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. Connect the EL-50334-14 Infotainment Test cable to the K74 Human Machine Interface Module.
  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.
    • If the P17 Info Display Module displays an image. 
  11. Replace the vehicle LVDS interface cable from the P17 Info Display Module to the K74 Human Machine Interface Module.
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