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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 297 (Supplemental Restraints System) >> Diagnostic Information and Procedures >> DTC B10BD >> 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.
    • S40 Instrument Panel Airbag Disable Switch
    • K36 Restraints Control Module
    • S40 Instrument Panel Airbag Disable Switch wiring harness connector
    • K36 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. It may take up to 2 minutes for all vehicle systems to power down.
  2. Verify the SIR system is disabled.
  3. Disconnect the harness connector at the S40 Instrument Panel Airbag Disable Switch.
  4. Test for less than 10 Ω between the low reference circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the X1 harness connector at the K36 Restraints Control Module.
    4. Test for less than 2 Ω in the low reference 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 10 Ω 
  5. Ignition ON, Vehicle in service mode.
  6. Test for 1 - 9 V between the signal circuit terminal 1 and ground.
    • If less than 1 V 
    1. Ignition OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the harness connector at the K36 Restraints Control Module.
    4. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    5. Test for less than 2 Ω in the signal 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.
    • If greater than 9 V 
    1. Ignition OFF.
    2. Verify the SIR system is disabled.
    3. Disconnect the X1 harness connector at the K36 Restraints Control Module.
    4. Ignition ON, Vehicle in service mode.
    5. Test for less than 1 V between the signal 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 between 1 - 9 V 
  7. Replace the S40 Instrument Panel Airbag Disable Switch.
  8. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  9. Verify the DTC does not set.
    • If the DTC sets 

      Replace the K36 Restraints Control Module.

    • Go to next step: If the DTC does not set 
  10. All OK.
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