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Home >> Buick >> 2013 >> Encore Base, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraint System >> Diagnostic Information and Procedures >> DTC B0074 >> Circuit/System Verification

Circuit/System Verification

NOTE:

This system allows you to service each component separately (module and sensor/sensing mat). Perform a Passenger Presence System Rezeroing 

  • Passenger presence sensor
  • Passenger presence sensor harness connector
  • Passenger presence module
  • Passenger presence module harness connector
  • Seat wiring harness to vehicle 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.

  1. Observe with the scan tool if the fault changes status while moving the passenger seat forward and backward through its full range of motion. The status should stay consistent.
    • The status changes 

      If the status changes this could be indication of a seat to vehicle harness connection issue, refer to Circuit/System Testing below.

    • The status does not change 
  2. Observe with the scan tool if the fault changes status while moving the harness near each connector listed below. The status should stay consistent.
    • Passenger presence module
    • Passenger presence sensor
    • Any seat harness inline
      • The status changes 

        If the reading is erratic while moving the harness, perform the following:

    • Inspect each connector terminal for damage or corrosion and repair as necessary.
    • Insure each connector and CPA is correctly seated.
      • The status does not change 
  3. All OK.