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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Supplemental Restraint System) >> Diagnostic Information and Procedures >> DTC B0019 or B0020 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
    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:
      • F101 Passenger Instrument Panel 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.
      • F101 Passenger Instrument Panel 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:F101 Passenger Instrument Panel 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.

      • F101 Passenger Instrument Panel 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.


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.
    • Passenger instrument panel air bag
    • inflatable restraint sensing and diagnostic module
    • Passenger instrument panel 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.
  • 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. Verify the scan tool Deployment Loop Resistance parameters stay consistently between 2.1 - 4.0 Ω without any spikes or dropouts while moving the harness near each connector listed below:
    • F101 Passenger Instrument Panel Air Bag
    • Any inline harness connector
    • K36 Inflatable Restraint Sensing and Diagnostic Module
    • If less than 2.1 Ω or greater than 4.0 Ω 

      Refer to Circuit/System Testing.

    • If there are spikes or dropouts, perform the following 
    • Inspect each connector terminal and harness for damage or corrosion and repair as necessary
    • Apply dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087) to each connector terminal
    • Insure each connector and CPA is correctly seated.
    • Go to next step: If between 2.1 - 4.0 Ω without any spikes or dropouts 
  2. All OK.
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