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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 297 (Supplemental Restraints System) >> Diagnostic Information and Procedures >> DTC B1619 or B161A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Refer to SIR Service Precautions .
  • Refer to SIR Disabling and Enabling .
  • Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
    • Seat belt retractor pretensioner
    • Restraints Control Module
    • Seat belt retractor pretensioner wiring harness connector
    • Restraints Control Module wiring harness connector
  • The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click.
  1. Ignition OFF, scan tool disconnected.. It may take up to 2 min for all vehicle systems to power down.
  2. Verify the SIR system is disabled.
  3. Disconnect the harness connector at the appropriate F112 Seat Belt Retractor Pretensioner.
  4. Test for greater than 25 Ω between the control circuit terminals 1 and 2.
    • If 25 Ω or less 
    1. Disconnect the X2 harness connector at the K36 Restraints Control Module.
    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 Restraints Control Module.
    • Go to next step: If greater than 25 Ω 
  5. Ignition ON.
  6. Verify the SIR system is disabled.
  7. Test for less than 11 V between each control circuit terminal listed below and ground:
    • Control circuit terminal 1
    • Control circuit terminal 2
    • If 11 V or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K36 Restraints Control Module, ignition ON
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K36 Restraints Control Module.
    • Go to next step: If less than 11 V 
  8. Ignition OFF.
  9. Verify the SIR system is disabled.
  10. Test for greater than 25 Ω 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 X2 harness connector at the K36 Restraints Control Module.
    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 Restraints Control Module.
    • Go to next step: If greater than 25 Ω 
  11. Install a 3 A fused jumper wire between the control circuit terminals 1 and 2, ignition ON.
  12. Verify the scan tool Deployment Loop Resistance parameter is less than 2 Ω.
    • If 2 Ω or greater 
    1. Ignition OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the X2 harness connector at the K36 Restraints Control Module.
    4. 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 K36 Restraints Control Module.
    • Go to next step: If less than 2 Ω 
  13. Ignition OFF, connect the harness connector at the F112 Seat Belt Retractor Pretensioner, press in the CPA (if equipped) until an audible and/or tactile click is heard.
  14. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  15. Verify DTC B1619 or B161A is not set.
    • If DTC B1619 or B161A is set 

      Replace the appropriate F112 Seat Belt Retractor Pretensioner.

    • Go to next step: If DTC B1619 or B161A is not set 
  16. A fault is not currently present and may be an intermittent condition.
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