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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0085 or B0086: Left Front Side Impact Sensor/Right Front Side Impact Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate B59 or B63 Impact Sensor, wait 2 min.
  2. Test for less than 10 Ω between the low reference circuit terminal 2 and ground.
    • If 10 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 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 Inflatable Restraint Sensing and Diagnostic Module.
    • If less than 10 Ω 
  3. Test for greater than 50 kΩ between the signal circuit terminal 1 and ground.
    • If 50 kΩ or less 
    1. Disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for infinite resistance between the signal 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.
    • If greater than 50 kΩ 
  4. Ignition ON, test for less than 1 V between the signal circuit terminal 1 and ground.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Ignition ON, test for less than 1 V between the signal circuit and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • If less than 1 volt 
  5. Ignition OFF, disconnect the harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  6. Test for less than 2 Ω between the signal circuit end to end from the impact sensor terminal 1 and the K36 Inflatable Restraint Sensing and Diagnostic Module terminal listed below:
    • B63LF Side Impact Sensor - Left Front terminal 19 X2
    • B63RF Side Impact Sensor - Right Front terminal 22 X2
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  7. Ignition OFF, reconnect all harness connectors, press in the CPA (if equipped) until an audible and/or tactile click is heard.
  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 appropriate B63 Side Impact Sensor.

    • If the DTC does not set 
  10. All OK.
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