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Home >> Chevrolet >> 2014 >> Express 1500 LS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection System And Pedestrian Protection System >> Diagnostic Information And Procedures (Object Detection System And Pedestrian Protection System) >> Rear Vision Camera System Malfunction (Without Navigation Radio UYS)(Object Detection System And Pedestrian Protection System) >> Circuit/System Testing (Object Detection System And Pedestrian Protection System)

Circuit/System Testing (Object Detection System And Pedestrian Protection System)

Rearview Camera System Always On

  1. Ignition OFF and all vehicle systems OFF, disconnect the X1 harness connector at the Rearview Camera.
  2. Engine running, transmission in park.
  3. Verify a test lamp does not illuminate between the control circuit terminal 3 and ground.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the harness connector at the body control module (BCM) and Inside Rearview Mirror, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
    • If the test lamp does not illuminate 
  4. Replace the Rearview Camera.

Rearview Camera System Does Not Display

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the Inside Rearview Mirror. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the ground circuit terminal 8 and ground.
    • If 5 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 5 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 13 and ground.
    • If the test lamp does not illuminate 
    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.
    3. If the circuit tests normal, test or replace the RUN/CRNK Relay.
    • If the test lamp illuminates 
  5. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
  6. Verify a test lamp illuminates between the control circuit terminal 9 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the X7 harness connector at the BCM and the X1 harness connector at the Rearview Camera
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Backup Lamps Malfunction .
    • If the test lamp illuminates 
    7. NOTE:

    Use only the J39200 DMM. Using a DMM other than the J39200 may result in an inaccurate measurement and lead to a misdiagnosis.

  7. Ignition OFF, connect a DMM between the signal circuit terminal 6 and the signal circuit terminal 7. Set the DMM to the AC voltage mode and press the Hz button to measure frequency.
  8. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
  9. Verify the frequency is between 1k-100 kHz.
    • If the frequency is not between 1k-100 kHz 
    1. Ignition OFF, disconnect the X1 harness connector at the Rearview Camera. It may take up to 2 minutes for all vehicle systems to power down.
    2. Test for less than 5 Ω between the ground circuit terminal 5 and ground.
      • If 5 Ω or greater, test the ground circuit for an open/high resistance.
      • If less than 5 Ω
    3. Ignition ON.
    4. Verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
      • If the test lamp does not illuminate and the circuit fuse is good, test the ignition circuit for an open/high resistance.
      • If the test lamp does not illuminate and the circuit fuse is open, test the ignition circuit for a short to ground. If the circuit tests normal, replace the Rearview Camera.
      • If the test lamp illuminates
    5. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
    6. Verify a test lamp illuminates between the control circuit terminal 3 and ground.
      • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
      • If the test lamp illuminates.
    7. Ignition ON.
    8. Test for less than 1 V between the signal circuits listed below and ground.
      • Terminal 1
      • Terminal 4
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V.
    9. Ignition OFF.
    10. Test for infinite resistance between the signal circuits listed below and ground.
      • Terminal 1
      • Terminal 4
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance.
    11. Test for less than 2 Ω between the terminals listed below.
      • Rearview Camera signal circuit terminal 1 and the Inside Rearview Mirror signal circuit terminal 6
      • Rearview Camera signal circuit terminal 4 and the Inside Rearview Mirror signal circuit terminal 7
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2 Ω.
    12. Replace the Rearview Camera.
    • If the frequency is between 1k-100 kHz 
  10. Connect the harness connector at the Inside Rearview Mirror.
  11. Engine running with the drive wheels chocked, set the park brake and place the transmission in reverse.
  12. Verify a clear rear vision image is displayed on the Inside Rearview Mirror.
    • If a clear image is not displayed 

      Replace the Inside Rearview Mirror.

    • If a clear image is displayed 
  13. All OK.
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