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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 Verification

Circuit/System Verification

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:
  • 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.
    • Side Impact Sensor
    • Inflatable Restraint Sensing and Diagnostic Module
    • Front impact sensor wiring harness connector
    • Side Impact Sensor 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. Replace any CPA that is damaged or missing.
  • 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 that DTC B0085 or B0088 symptom byte 39 or 71 is not set as current.
    • If DTC B0085 or B0088 symptom byte 39 or 71 is set as current 

      Replace the sensor listed below:

    • B0085 - B63LF Side Impact Sensor-Left Front
    • B0088 - B63RR Side Impact Sensor-Right Rear
    • Go to next step: If DTC B0085 or B0088 symptom byte 39 or 71 is not set as current 
  2. Verify that DTC B0085 or B0088 symptom byte 3A is not set as current.
    • If DTC B0085 or B0088 symptom byte 3A is set as current 

      Replace the incorrect B63 Side Impact Sensor

    • Go to next step: If DTC B0085 or B0088 symptom byte 3A is not set as current 
  3. Verify that DTC B0085 or B0088 symptom byte 02 or 05 is set as current.
    • If only DTC B0085 symptom byte 01, 02 or 04 is set as current 

      Refer to Circuit/System Testing - Only DTC B0085 or B0088 is set.

    • If only DTC B0088 symptom byte 01, 02 or 04 is set as current 

      Refer to Circuit/System Testing - Only DTC B0085 or B0088 is set.

    • If both DTC B0085 or B0088 symptom byte 01 or 02 is set as current 

      Refer to Circuit/System Testing - Both DTC B0085 and B0088 are set.

    • Go to next step: If DTC B0085 or B0088 symptom byte 01 or 02 is not set as current 
  4. All OK.
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