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Home >> Cadillac >> 2016 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 75 (Object Detection And Pedestrian Protection System (Coupe)) >> Diagnostic Information and Procedures >> DTC B009C: Pedestrian Impact Detection Discrimination Sensor >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2015 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the front upper beam pedestrian impact detection sensor.
  2. Ignition OFF, test for less than 5 ohms between the sensor ground circuit terminal 3 and ground.
    • If greater than the specified value, test the circuit for a short to voltage and an open/high resistance. If the circuit tests normal, replace the pedestrian impact detection module.
  3. Ignition ON, verify a test lamp illuminates between the sensor supply voltage circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the pedestrian impact detection module.
  4. Ignition OFF, disconnect the harness connector at the pedestrian impact detection module.
  5. Test for infinite resistance between the sensor signal circuit terminal 2 and ground.
    • If less than infinite resistance, test the circuit for a short to ground.
  6. Ignition ON, test for less than 1 volt between the sensor signal circuit terminal 2 and ground.
    • If greater than the specified value, test the circuit for a short to voltage.
  7. Ignition ON, test for less than 1 volt between the sensor low reference circuit terminal 1 and ground.
    • If greater than the specified value, test the circuit for a short to voltage.
  8. Test for less than 1 ohm between the sensor low reference circuit terminal 1 and the pedestrian impact detection module terminal 40.
    • If greater than the specified value, test the circuit for an open/high resistance.
  9. Test for less than 1 ohm between the sensor signal circuit terminal 2 and the pedestrian impact detection module terminal 39.
    • If greater than the specified value, test the circuit for an open/high resistance.
  10. If all circuits test normal, replace the front upper beam pedestrian impact detection sensor.
  11. With a scan tool, clear DTCs.
  12. Verify DTC B009C is not set.
    • If DTC is set, replace the pedestrian impact detection module.
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