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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 329 (Object Detection System And Pedestrian Protection System) >> Diagnostic Information and Procedures >> Rear Vision Camera System Malfunction >> Circuit/System Testing (Without UVH)
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Circuit/System Testing (Without UVH)

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Circuit/System Verification must be performed before Circuit/System Testing.
  • Under normal operating conditions the Human Interface Machine Control Module will become very hot. The module should be allowed to cool down prior to removal for any service procedure.
  1. Ignition OFF, disconnect the X901 harness connector.
  2. Test for less than 10 Ω between the ground circuit terminal 5 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.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 10 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.
    • If the test lamp illuminates 
  5. Ignition OFF, disconnect the X2 harness connector at the K74 Human Interface Control Module (with I05 or I06) or X1 harness connector at the A11 Radio (with I08), ignition ON.
  6. Test for less than 1 V between the signal circuit terminal listed below and ground:
    • X901 signal (+) circuit terminal 7
    • X901 signal (-) circuit terminal 8
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  7. Ignition OFF, test for infinite resistance between the signal circuit terminal listed below and ground:
    • X901 signal (+) circuit terminal 7
    • X901 signal (-) circuit terminal 8
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  8. Test for less than 2 Ω in the signal (+) circuit end to end.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  9. Test for less than 2 Ω in the signal (-) circuit end to end.
    • If 2 Ω or greater 

      Test the signal circuit for an open/high resistance.

    • If less than 2 Ω 
  10. Connect the X901 harness connector. Disconnect the B87 Rearview Camera harness connector.
  11. Ignition ON.
  12. Verify a test lamp illuminates between the ignition circuit terminal 5 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.
    • If the test lamp illuminates 
  13. Test for infinite resistance between the signal circuit terminal listed below and ground:
    • B87 Rearview Camera signal (+) circuit terminal 1
    • B87 Rearview Camera signal (-) circuit terminal 2
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  14. Test for less than 2 Ω in the signal (+) circuit from B87 Rearview Camera to the X901 harness connector.
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  15. Test for less than 2 Ω in the signal (-) circuit from B87 Rearview Camera to the X901 harness connector.
    • If 2 Ω or greater 

      Test the signal circuit for an open/high resistance.

    • If less than 2 Ω 
  16. Replace the B87 Rearview Camera.
  17. Engine running, transmission in R, 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 K74 Human Interface Control Module.

    • If a clear rear vision image is displayed 
  18. All OK.
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