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Home >> GMC >> 2018 >> Acadia Denali, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1 (Object Detection System And Pedestrian Protection System) >> Diagnostic Information and Procedures >> DTC B009A or B009B: Hood Hinge Actuator Deployment Loop >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector listed below at the appropriate Hood Hinge Actuator:
    • F100L Hood Hinge Actuator - Left connector
    • F100R Hood Hinge Actuator - Right connector
  2. Test for greater than 25 Ω between the control circuit terminal 1 and the control circuit terminal 2.
    • If 25 Ω or less 
    1. Disconnect the X1 harness connector at the K42 Pedestrian Impact Detection Control Module.
      2. NOTE:

      Some connectors may be equipped with shorting bars as a safety component to prevent accidental deployment. When testing on a connector with shorting bars, the shorting bars must be disabled to ensure accurate test results. Insert an appropriate pick from EL-38125-580 and depress the shorting bars above the appropriate terminals. This will lift the shorting bar from the terminal and allow accurate test results. Take care not to damage the connector, shorting bar, or terminal when depressing the shorting bar.

    2. Test for infinite resistance between the two control circuits.
      • If less than infinite resistance, repair the short between the two circuits.
      • If infinite resistance, replace the K42 Pedestrian Impact Detection Control Module.
    • If greater than 25 Ω 
  3. Ignition ON.
  4. Test for less than 11 V between the following control circuits and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 11 V or greater 
    1. Ignition OFF, disconnect the X1 harness connector at the K42 Pedestrian Impact Detection Control Module, ignition ON.
    2. Test for less than 1 V between the appropriate control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K42 Pedestrian Impact Detection Control Module.
    • If less than 11 V 
  5. Ignition OFF.
  6. Test for greater than 25 Ω resistance between each control circuit terminal listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 25 Ω or less 
    1. Disconnect the X1 harness connector at the K42 Pedestrian Impact Detection Control Module.
      2. NOTE:

      Some connectors may be equipped with shorting bars as a safety component to prevent accidental deployment. When testing on a connector with shorting bars, the shorting bars must be disabled to ensure accurate test results. Insert an appropriate pick from EL-38125-580 and depress the shorting bars above the appropriate terminals. This will lift the shorting bar from the terminal and allow accurate test results. Take care not to damage the connector, shorting bar, or terminal when depressing the shorting bar.

    2. Test for infinite resistance between the appropriate control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K42 Pedestrian Impact Detection Control Module.
    • If greater than 25 Ω 
  7. Install a 3 A fused jumper wire between the control circuit terminals 1 and 2. Ignition ON.
  8. Verify the appropriate scan tool Hood Hinge Deployment Loop Resistance parameter is less than 2 Ω.
    • If 2 Ω or greater 
    1. Ignition OFF. Disconnect the X2 harness connector at the K42 Pedestrian Impact Detection control Module.
    2. Test for less than 2 Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K42 Pedestrian Impact Detection control Module.
    • If less than 2 Ω 
  9. Ignition OFF, connect the harness connector at the appropriate Hood Hinge Actuator, press in the CPA (if equipped) until an audible and/or tactile click is heard.
  10. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  11. Verify DTC B009A or B009B is not set.
    • If DTC B009A or B009B is set 

      Replace the appropriate Hood Hinge Actuator.

    • If DTC B009A or B009B is not set 
  12. All OK.
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