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Home › Hummer › 2009 › H3 Base, Automatic › Repair and Diagnosis › Accessories & Equipment › Collision/Avoidance › Object Detection System › Diagnostic Information and Procedures › Rear Vision Camera System Malfunction (H3T) › Circuit/System Testing › Rearview Camera System Does Not Display

Rearview Camera System Does Not Display

  1. Ignition OFF, disconnect the harness connector at the rearview camera.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Engine running, verify a test lamp illuminates between the ignition circuit terminal 6 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Park brake applied, transmission in REVERSE, test for B+ between the B+ circuit terminal 3 and ground.
    • If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. Test for less than 1 volt between the following signal circuit terminals at the rearview camera harness connector and ground:
    • Signal (+) circuit terminal 1
    • Signal (-) circuit terminal 4
    • If greater than the specified range, test the signal circuit for a short to voltage.
  6. Test for infinite resistance between the following circuit terminals at the rearview camera harness connector and ground:
    • Signal (+) circuit terminal 1
    • Signal (-) circuit terminal 4
    • If not the specified value, test the circuit for a short to ground.
  7. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  8. Test for less than 2 ohms between the signal (+) circuit terminal 1 at the rearview camera harness connector and the signal (+) circuit terminal 6 at the inside rearview mirror harness connector.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  9. Test for less than 2 ohms between the signal (-) circuit terminal 4 at the rearview camera harness connector and the signal (-) circuit terminal 7 at the inside rearview mirror harness connector.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  10. If all circuits test normal, test or replace the rearview camera.
  11. Ignition ON, transmission in REVERSE, verify a clear rear vision image is displayed on the inside rearview mirror.
    • If a clear rear vision image is not displayed, replace the inside rearview mirror.
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