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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Information and Procedures >> DTC B0016, B0018, B0023, or B0025: Roof Rail Air Bag Deployment Loop >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF. Scan tool disconnected. It may take up to 2 minutes for all vehicle systems to power down. Disconnect the appropriate harness connector at the roof rail air bag listed below:
    • DTC B0016 - F105L Roof rail air bag - left
    • DTC B0023 - F105R Roof rail air bag - right
  2. Test for greater than 25Ω between the control circuit terminals 1 and 2.
    • If 25Ω or less 
    1. Disconnect the X2 harness connector at the K36 SDM.
      2. NOTE:

      Some connectors may be equipped with shorting bars as a safety component to prevent accidental inflator 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 K36 SDM.
    • If greater than 25Ω 
  3. Ignition ON.
  4. Test for less than 11V between the control circuit terminals listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 11V or greater 
    1. Ignition OFF. Disconnect the X2 harness connector at the K36 SDM. Ignition ON.
    2. Test for less than 1V between the control circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K36 SDM.
    • If less than 11V 
  5. Ignition OFF.
  6. Test for greater than 25Ω between the control circuit terminals listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 25Ω or less 
    1. Disconnect the X2 harness connector at the K36 SDM.
    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, replace the K36 SDM.
    • If greater than 25Ω 
  7. Ignition OFF. Install a 3A fused jumper wire between the appropriate control circuit terminals 1 and 2. Ignition ON.
  8. Verify the scan tool Deployment Loop Resistance parameter is less than 2Ω.
    • If 2Ω or greater 
    1. Ignition OFF. Disconnect the X2 harness connector at the K36 SDM.
    2. Test for less than 2Ω in each control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K36 SDM.
    • If less than 2Ω 
  9. Ignition OFF, connect the harness connector at the F105L roof rail air bag - left or F015R roof rail air bag - right, 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 B0016, B0018, B0023, or B0025 is not set.
    • If DTC B0016, B0018, B0023, or B0025 is set 

      Replace the appropriate F105L roof rail air bag - left or F015R roof rail air bag - right.

    • If DTC B0016, B0018, B0023, or B0025 is not set 
  12. All OK.
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