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Home >> Chevrolet >> 2012 >> Traverse LS, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0085 or B0088: Front Side Impact Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

The signal circuit is shared at the K36 Inflatable Restraint Sensing and Diagnostic Module between the B63LF Side Impact Sensor - Left Front and the B63RR Side Impact Sensor - Right Rear (DTC B0085 and DTC B0088). Therefore a short to ground or short to voltage in either of these signal circuits can set a DTC for both circuits, and an open in either circuit should only set its corresponding DTC.

Only DTC B0085 or B0088 is set

  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. 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. Ignition ON.
  4. Test for less than 10 V between the signal circuit terminal 1 and ground.
    • If 10 V or greater 
    1. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • If less than 10 V 
  5. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module.
  6. Test for less than 2 Ω between the B63 Side Impact Sensor signal circuit terminal 1 and the appropriate K36 Inflatable Restraint Sensing and Diagnostic Module signal circuit terminal listed below:
    • Left front signal terminal 19 X2
    • Right rear signal terminal 30 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 
    1. Replace the B63 side impact sensor.
    2. Verify the DTC does not set.
      • If the DTC sets, replace the K36 Inflatable Restraint Sensing and Diagnostic Module.
      • If the DTC does not set.
    3. All OK.
    • If the DTC does not set 
  10. All OK.

Both DTC B0085 and B0088 are set

  1. Ignition OFF. Disconnect the X2 harness connector at the K36 Inflatable Restraint Sensing and Diagnostic Module. It may take up to 2 min for all vehicle systems to power down.
  2. Test for greater than 50k Ω between each signal circuit listed below and ground:
    • Left front signal circuit - terminal 19 X2
    • Right rear signal circuit - terminal 30 X2
    • If 50k Ω or less 
    1. Ignition OFF. Disconnect the harness connector at the B63 Side Impact Sensor that failed the test. Ignition ON.
    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 B63 Side Impact Sensor.
    • If greater than 50k Ω 
  3. Ignition ON.
  4. Test for less than 1 V between the signal circuit terminals listed below and ground:
    • Left front signal circuit - terminal 19 X2
    • Right rear signal circuit - terminal 30 X2
    • If 1 V or greater 
    1. Disconnect the harness connector at the B63 Side Impact Sensor that failed the test.
    2. Test for less than 1 V between signal circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the B63 Side Impact Sensor.
    • If less than 1 V 
  5. Ignition OFF, reconnect all harness connectors, press in the CPA (if equipped) until an audible and/or tactile click is heard.
  6. Ignition ON, clear DTCs. Operate the vehicle within the Conditions for Running the DTC.
  7. Verify the DTC does not set.
    • If the DTC sets 

      Replace the K36 Inflatable Restraint Sensing and Diagnostic Module.

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