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Home >> Buick >> 2017 >> Envision Base >> Repair and Diagnosis (Single Page) >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Information and Procedures >> DTC B0081: Passenger Presence Module (Passenger Presence Module) >> Circuit/System Verification

Circuit/System Verification

NOTE:
  • This system is serviced as a kit (seat foam, module and sensing mat). Perform a passenger presence system rezero procedure whenever a component is replaced. Refer to Passenger Presence System Programming and Setup .
  • Both K36 Inflatable Restraint Sensing and Diagnostic Module and K85 Passenger Presence Module set DTC B0081 but with different symptoms bytes. Therefore it is important to identify which module has set the DTC B0081. Use the symptom bytes as a way of identify the correct module to diagnose.
  • The K36 Inflatable Restraint Sensing and Diagnostic Module sets a B0081 3A when an incorrect K85 Passenger Presence Module is installed.
  1. Verify that the seat is free of any objects or an aftermarket seat heater.
    • If objects and/or an aftermarket seat heater is present 
    1. Remove objects and/or aftermarket seat heater.
    2. Ignition ON, clear the DTC.
    3. Verify that DTC B0081 is not set
      • If the DTC B0081 is set, replace the K85 Passenger Presence Module
      • If the DTC B0081 is not set
    4. All OK.
    • If the seat is empty and does not have an aftermarket seat heater 
  2. Verify that DTC B0081 3A is not set in the K36 Inflatable Restraint Sensing and Diagnostic Module.
    • If DTC B0081 3A is set in the K36 Inflatable Restraint Sensing and Diagnostic Module 

      Replace the K85 Passenger Presence Module.

    • If DTC B0081 3A is not set in the K36 Inflatable Restraint Sensing and Diagnostic Module 
  3. Verify that DTC B0081 11 or DTC B0081 4B is not set in the K85 Passenger Presence Module.
    NOTE:

    The K36 Inflatable Restraint Sensing and Diagnostic Module sets a redundant B0081 00 DTC when the K85 Passenger Presence Module sets a DTC B0081 11 or B0081 4B.

    • If neither of these DTCs are set in the K85 Passenger Presence Module 
  4. Verify DTC B0081 5A is not set in the K85 Passenger Presence Module.
    • If DTC B0081 5A is set in the K85 Passenger Presence Module 
    1. Verify the connections at the K36 Inflatable Restraint Sensing and Diagnostic Module and K85 Passenger Presence Module, for terminal corrosion, properly seated connectors, and the connector position assurance is installed.
    2. Clear the DTC.
    3. Verify DTC B0081 5A does not set in the K85 Passenger Presence Module.
      • If DTC B0081 5A sets, replace the K85 Passenger Presence Module.
      • If DTC B0081 5A does not set
    4. All OK.
    • If DTC B0081 5A is not set in the K85 Passenger Presence Module 
  5. All OK.
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