LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Information and Procedures >> DTC B0019 or B0020: Passenger Instrument Panel Air Bag Deployment Loop >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF. Scan tool disconnected. Disconnect the F105 passenger instrument panel air bag inline harness connector X205. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for greater than 25Ω between the appropriate control circuit terminals listed below on the K36 SDM side of the connector:
    • F105 Passenger instrument panel air bag stage 1 X205 terminal 1 and 2
    • F105 Passenger instrument panel air bag stage 2 X205 terminal 4 and 5
    • If 25Ω or less 
    1. Disconnect the X1 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:
    • X205 control circuit terminal 1
    • X205 control circuit terminal 2
    • X205 control circuit terminal 4
    • X205 control circuit terminal 5
    • If 11V or greater 
    1. Ignition OFF. Disconnect the X1 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:
    • X205 control circuit terminal 1
    • X205 control circuit terminal 2
    • X205 control circuit terminal 4
    • X205 control circuit terminal 5
    • If 25Ω or less 
    1. Disconnect the X1 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. Install a 3A fused jumper wire between the control circuit terminals listed below:
    • F105 Passenger instrument panel air bag stage 1 X205 terminal 1 and 2
    • F105 Passenger instrument panel air bag stage 2 X205 terminal 4 and 5
  8. Ignition ON.
  9. Verify the scan tool Deployment Loop Resistance parameter is less than 2Ω.
    • If 2Ω or greater 
    1. Ignition OFF. Disconnect the X1 harness connector at the K36 SDM.
    2. Test for less than 2Ω in each control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K36 SDM.
    • If less than 2Ω 
  10. Ignition OFF. Reconnect the inline harness connector X205. Disconnect the appropriate F105 Passenger instrument panel air bag harness connector X1 (DTC B0019) or X2 (DTC B0020). Ignition ON.
  11. Test for less than 11V between the control circuit terminals listed below and ground:
    • F105 passenger instrument panel air bag control circuit terminal 1 X1
    • F105 passenger instrument panel air bag control circuit terminal 2 X1
    • F105 passenger instrument panel air bag control circuit terminal 1 X2
    • F105 passenger instrument panel air bag control circuit terminal 2 X2
    • If 11V or greater 

      Repair the short to voltage on the circuit.

    • If less than 11V 
  12. Ignition OFF.
  13. Test for greater than 25Ω between the control circuit terminals listed below and ground:
    • F105 passenger instrument panel air bag control circuit terminal 1 X1
    • F105 passenger instrument panel air bag control circuit terminal 2 X1
    • F105 passenger instrument panel air bag control circuit terminal 1 X2
    • F105 passenger instrument panel air bag control circuit terminal 2 X2
    • If 25Ω or less 

      Repair the short to ground on the circuit.

    • If greater than 25Ω 
  14. Install a 3A fused jumper wire between the control circuit terminals listed below:
    • F105 Passenger instrument panel air bag stage 1 control circuit terminal 1 X1 and 2 X1
    • F105 Passenger instrument panel air bag stage 2 control circuit terminal 1 X2 and 2 X2
  15. Ignition ON.
  16. Verify the scan tool Deployment Loop Resistance parameter is less than 2Ω.
    • If 2Ω or greater 
    1. Ignition OFF. Disconnect the X1 harness connector at the K36 SDM.
    2. Test for less than 2Ω in each control circuit end to end.
    • If greater than 2Ω 

      Repair the open/high resistance in the circuit between the F105 passenger instrument panel air bag connector and the X205 inline harness connector.

    • If less than 2Ω 
  17. Ignition OFF, connect the harness connector at the F105 passenger instrument panel air bag, press in the CPA (if equipped) until an audible and/or tactile click is heard.
  18. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  19. Verify DTC B0019 or B0020 is not set.
    • If DTC B0019 or B0020 is set 

      Replace the F105 passenger instrument panel air bag.

    • If DTC B0019 or B0020 is not set 
  20. All OK.
scientia non olet · About LEMON Manuals