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Circuit/System Testing

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Refer to SIR Service Precautions .
  • 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.
    • Pyrotechnic rollover bar actuator
    • Inflatable restraint sensing and diagnostic module
    • Rollover bar air bag wiring harness connector
    • Inflatable restraint sensing and diagnostic 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. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.
  • If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.
  1. Ignition OFF, disconnect the scan tool and then disconnect the harness connector at the appropriate F121 Pyrotechnic Rollover Bar Actuator and then wait 2 min.
  2. Test for greater than 25 Ω between the control circuit terminals listed below:
    • F121R Pyrotechnic Rollover Bar Actuator - Right terminal 1 and 2
    • F121L Pyrotechnic Rollover Bar Actuator - Left terminal 1 and 2
    • If 25 Ω or less 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
      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 Inflatable Restraint Sensing and Diagnostic Module.
    • Go to next step: If greater than 25 Ω 
  3. Ignition ON.
  4. Test for less than 11 V between the control circuit terminals listed below and ground:
    • F121 Pyrotechnic Rollover Bar Actuator control circuit terminal 1
    • F121 Pyrotechnic Rollover Bar Actuator control circuit terminal 2
    • If 11 V or greater 
    1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic 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 Inflatable Restraint Sensing and Diagnostic Module.
    • Go to next step: If less than 11 V 
  5. Ignition OFF.
  6. Test for greater than 25 Ω between the control circuit terminals listed below and ground:
    • F121 Pyrotechnic Rollover Bar Actuator control circuit terminal 1
    • F121 Pyrotechnic Rollover Bar Actuator control circuit terminal 2
    • If 25 Ω or less 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic 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 Inflatable Restraint Sensing and Diagnostic Module.
    • Go to next step: If greater than 25 Ω 
  7. Ignition OFF, install a 3 A fused jumper wire between the control circuit terminals listed below, ignition ON:
    • F121R Pyrotechnic Rollover Bar Actuator - Right terminal 1 and 2
    • F121L Pyrotechnic Rollover Bar Actuator - Left terminal 1 and 2
  8. Verify the scan tool Deployment Loop Resistance parameter is less than 2 Ω.
    • If 2 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic 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 K36 Inflatable Restraint Sensing and Diagnostic Module.
    • Go to next step: If less than 2 Ω 
  9. Ignition OFF, connect the harness connector at the F121 Pyrotechnic Rollover Bar 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 B001C or B001D is not set.
    • If DTC B001C or B001D is set 

      Replace the appropriate F121 Pyrotechnic Rollover Bar Actuator.

    • Go to next step: If DTC B001C or B001D is not set 
  12. All OK.
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