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Home >> GMC >> 2019 >> Sierra 2500 HD Base, 2D Pickup, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 3115 (Image Display Camera System) >> Diagnostic Information And Procedures >> Rear Vision Camera System Malfunction (With IO3/IOB) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Sierra 3500 HD, 2018 GMC Sierra 2500 HD, 2018 GMC Sierra 1500, 2018 Chevrolet Silverado 3500 HD, and 2018 Chevrolet Silverado 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector X900. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 7 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit 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.
  4. Verify a test lamp illuminates between the ignition circuit terminal 4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse. Refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the B87 Rearview Camera.
    • Go to next step: If the test lamp illuminates 
  5. Engine running, parking brake applied, transmission in REVERSE.
  6. Verify a test lamp illuminates between the control circuit terminal 2 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the X4 harness connector at the X50A Fuse Block - Underhood
    2. Test for less than 2 Ω in the ignition circuit end to end.
    • Go to next step: If the test lamp illuminates 
  7. Ignition OFF, disconnect the X1 harness connector at the P17 Info Display Module, ignition ON.
  8. Test for less than 1 V between the signal circuit terminals listed below and ground:
    • P17 Info Display Module (+) circuit terminal 5 X1
    • P17 Info Display Module (-) circuit terminal 6 X1
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  9. Test for infinite resistance between the signal circuit terminals listed below and ground:
    • P17 Info Display Module (+) circuit terminal 5 X1
    • P17 Info Display Module (-) circuit terminal 6 X1
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  10. Test for less than 2 Ω between the P17 Info Display Module (+) circuit terminal 5 X1 and the X900 signal (+) circuit terminal 3.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  11. Test for less than 2 Ω between the P17 Info Display Module (-) circuit terminal 6 X1 and the X900 signal (+) circuit terminal 8.
    • If 2 Ω or greater 

      Test the signal circuit for an open/high resistance.

    • Go to next step: If less than 2 Ω 
  12. Ignition OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON.
  13. Test for less than 1 V between the signal circuit terminals listed below and ground:
    • A11 Radio signal (+) circuit terminal 15 X1
    • A11 Radio signal (-) circuit terminal 14 X1
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  14. Test for infinite resistance between the signal circuit terminals listed below and ground:
    • A11 Radio signal (+) circuit terminal 15 X1
    • A11 Radio signal (-) circuit terminal 14 X1
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  15. Test for less than 2 Ω between the A11 Radio signal (+) circuit terminal 15 X1 and the P17 Info Display Module signal (+) circuit terminal 7.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 2 Ω 
  16. Test for less than 2 Ω between the A11 Radio signal (-) circuit terminal 14 X1 and the P17 Info Display Module signal (+) circuit terminal 8.
    • If 2 Ω or greater 

      Test the signal circuit for an open/high resistance.

    • Go to next step: If less than 2 Ω 
  17. Add Nyogel lubricant 760G to electrical terminals.
  18. Reconnect all electrical connections.
  19. Engine running, parking brake applied, transmission in REVERSE.
  20. Verify a clear rear vision image is displayed on the P17 Info Display Module.
    • If a blank blue screen or distorted image is displayed 
    1. Replace the B87 Rearview Camera.
    2. Engine running, parking brake applied, transmission in REVERSE.
    3. Verify a clear rear vision image is displayed on the P17 Info Display Module.
      • If a clear rear vision image is not displayed 

        Replace the P17 Info Display Module.

      • Go to next step: If a clear rear vision image is displayed 
    4. All OK.
    • If a blank black screen is displayed 

      Replace the P17 Info Display Module.

    • Go to next step: If a clear rear vision image is displayed 
  21. Verify DTC B127B is not set.
    • If DTC B127B is set 

      Replace the A11 Radio.

    • Go to next step: If DTC B127B is not set 
  22. All OK.
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