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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 B0087 or B0088: Left Rear Side Impact Sensor/Right Rear Side Impact Sensor >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the appropriate B63 Side Impact Sensor. It may take up to 2 min for all vehicle systems to power down.
  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 X2 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 50k Ω between the signal circuit terminal 1 and ground.
    • If 50k Ω or less 
    1. Disconnect the X2 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 50k Ω 
  4. Ignition ON.
  5. 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, ignition ON.
    2. 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 V 
  6. Ignition OFF, disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  7. 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:
    • B63LR Side Impact Sensor - Left Middle terminal 27 X2
    • B63RR Side Impact Sensor - Right Middle terminal 30 X2
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  8. Connect all harness connectors. Ignition ON, clear the DTC.
  9. Verify the DTC does not set.
    • If the DTC sets 

      Replace the B63 Side Impact Sensor.

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