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Home >> Hummer >> 2009 >> H3T Alpha >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Object Detection System >> Diagnostic Information and Procedures >> Front Vision Camera System Malfunction >> Circuit/System Testing >> Front Vision System Does Not Display
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Front Vision System Does Not Display

  1. Ignition OFF, disconnect the harness connector at the frontview camera.
  2. Test for less than 10.0 ohm between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the frontview camera image display module.
  3. Engine running, frontview camera switch ON, test for 5.8-6.2 volts between the 6-volt reference circuit terminal A and ground.
    • If less than the specified range, test the reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the frontview camera image display module.
    • If greater than the specified range, test the reference circuit for a short to voltage. If the circuit tests normal, replace the frontview camera image display module.
  4. Ignition OFF, test for greater than 1.0 ohm between the camera video signal circuit terminal C and ground.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the frontview camera image display module.
  5. Engine running, verify that a test lamp does not illuminate between the camera video signal circuit terminal C and ground.
    • If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the frontview camera image display module.
  6. Ignition OFF, disconnect the frontview camera image display module.
  7. Test for less than 3.0 ohms between the signal circuit terminal C at the frontview camera harness connector and the signal circuit terminal 9 at the frontview camera image display module harness connector.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  8. Engine running, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  9. Verify that a test lamp illuminates between the ignition circuit terminal 2 and the ground circuit terminal 3.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  10. Frontview camera switch ON, verify that a test lamp illuminates between the control circuit terminal 1 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 frontview camera switch.
  11. Ignition OFF, test for greater than 1.0 ohm between the camera video signal circuit listed below and ground.
    • Signal circuit terminal 11
    • Signal circuit terminal 12
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the inside rearview mirror.
  12. Engine running, verify that a test lamp does not illuminate between the camera video signal circuit listed below and ground.
    • Signal circuit terminal 11
    • Signal circuit terminal 12
    • If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the inside rearview mirror.
  13. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  14. Test for less than 1.0 ohm between the signal circuit terminal 11 at the frontview camera image display module harness connector and the signal circuit terminal 2 at the inside rearview mirror harness connector.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  15. Test for less than 1.0 ohm between the signal circuit terminal 12 at the frontview camera image display module harness connector and the signal circuit terminal 1 at the inside rearview mirror harness connector.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  16. If all circuits test normal, replace the frontview camera image display module.
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