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HOMESERVICE MANUALSBUICK2019ENVISION BASEREPAIR AND DIAGNOSISRESTRAINTSAIR BAG, SRSSUPPLEMENTAL INFLATABLE RESTRAINT SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B0012CIRCUIT/SYSTEM VERIFICATION
2019 Buick Envision Base

Circuit/System Verification

2019 Buick Envision BaseSECTION Circuit/System Verification
    NOTE:
    • Refer to: SIR Service Precautions 
    • Inspect the terminals of the following components and connectors for damage or corrosion and repair or replace as necessary:
      • F107 Steering Wheel Air Bag
      • K36 Inflatable Restraint Sensing and Diagnostic Module
      • Inline Harness Connector
    • The connector position assurance (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.
    • If the condition is intermittent, wiggle the related wiring harnesses and connectors, with the ignition/vehicle on or engine running, while monitoring the scan tool circuit status parameters for the component. The parameters will display if there is a condition with the circuit or a connection.
    • If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease or lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.
      • F107 Steering Wheel Air Bag & Harness Connector
      • K36 Inflatable Restraint Sensing and Diagnostic Module & Harness Connector
  1. Ignition - On / Vehicle - In Service Mode
  2. Verify the appropriate scan tool parameter: Deployment Loop 1 - 20 Resistance = 2.1 to 4.0 ohms
    • If not between 2.1 and 4.0 ohms 

      Refer to: Circuit/System Testing

    • Go to next step: If between 2.1 and 4.0 ohms 
  3. Verify the appropriate scan tool parameter: Deployment Loop 1 - 20 Resistance = The value should not spike or drop out.

    Perform the action while monitoring the parameter:

    • Wiggle the harness and connector: F107 Steering Wheel Air Bag
    • Wiggle the harness and connector: K36 Inflatable Restraint Sensing and Diagnostic Module
    • Wiggle the harness and connector: Inline Harness Connector
    • If the value spikes or drops out 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Verify the condition does not exist with the component and repair as necessary:
        NOTE:

        Apply dielectric grease or lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087) to each connector terminal.

      • F107 Steering Wheel Air Bag @ Wiring Harness Connector - Corrosion/Defective/Loose/Poor Connection/Visible Damage
      • K36 Inflatable Restraint Sensing and Diagnostic Module @ Wiring Harness Connector - Corrosion/Defective/Loose/Poor Connection/Visible Damage
      • Inline Harness Connector - Corrosion/Defective/Loose/Poor Connection/Visible Damage
    • Go to next step: If the value does not spike or drop out 
  4. All OK.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.