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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 27 (Supplemental Inflatable Restraints) >> Diagnostic Information and Procedures >> DTC B0085 or B0088 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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 will 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 minutes 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.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for 4-9 V between the signal circuit terminal 1 and ground.
    • If less than 4 V 
    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 in the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal 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 greater than 9V 
    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.
    • Go to next step: If between 4-9 V 
  5. Ignition OFF, connect 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 
    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.
      • Go to next step: If the DTC does not set.
    3. All OK.
    • Go to next step: If the DTC does not set 
  8. 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 minutes 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.
    • Go to next step: 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.
    • Go to next step: If less than 1 V 
  5. Ignition OFF, connect 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.

    • Go to next step: If the DTC does not set 
  8. All OK.
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