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Home >> Buick >> 2020 >> Envision Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Radio Information Display Malfunction (IOB) >> Circuit/System Testing >> Blank Screen

Blank Screen

WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF/vehicle OFF and all vehicle systems OFF, disconnect the X1 harness connector at the P17 Info Display Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the following ground circuit terminals and ground:
    • terminal 9
    • terminal 10
    • If 10 Ω or greater 
    1. Test for less than 2 Ω in the ground circuits 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.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON/vehicle in Service Mode.
  4. Test for 5 V or greater between control circuit terminal 1 and ground.
    • If less than 5 V 
    1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω on 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 A11 Radio.
    • Go to next step: If 5 V or greater. 
  5. Disconnect the harness connector at the A22 Radio Controls.
  6. Test for infinite resistance between the P17 Info Display Module harness connector X1 terminal 3 and ground.
    • If less than infinite resistance repair the short to ground on the circuit. 
    • Go to next step: If infinite resistance. 
  7. Disconnect the LVDS interface cable from the P17 Info Display Module.
  8. 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.
  9. Disconnect the LVDS interface cable from the A11 Radio. Connect the EL-50334 - 14 Infotainment Test cable to the A11 Radio.
  10. Ignition ON/Vehicle in Service Mode, infotainment system ON.
  11. Verify the P17 Info Display Module displays an image.
    • If the P17 Info Display Module does not display an image 
    1. Engine running, parking brake applied, transmission in REVERSE.
    2. Verify the P17 Info Display Module displays a rear view image.
      • If the P17 Info Display Module displays a rear view image, replace the A11 Radio.
      • Go to next step: If the P17 Info Display Module does not display a rear view image.
    3. Replace the P17 Info Display Module.
    4. Ignition ON, infotainment system ON.
    5. Verify the P17 Info Display Module displays an image.
      • If the P17 Info Display Module still does not display an image, replace the A11 Radio.
      • Go to next step: If the P17 Info Display Module displays an image.
    6. All OK.
    • Go to next step: If the P17 Info Display Module displays an image. 
  12. Replace the vehicle LVDS interface cable from the P17 Info Display Module to the A11 Radio.
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