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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Inflatable Restraints >> Diagnostic Information and Procedures >> DTC B0090 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
  • The vehicle rollover sensor
  • The SDM module
  • The vehicle rollover sensor harness connector
  • The SDM wiring harness connector
  1. Verify DTC B0090 39 is not set.
    • If DTC is set, replace the rollover sensor.
  2. Ignition OFF, disconnect the harness connector at the rollover sensor and the SDM.
  3. Test for less than 5 ohms between the rollover sensor ground circuit terminal 6 and ground.
    • If greater then the specified range, test the circuit for an open/high resistance.
  4. Test for less than 5 ohms between the serial data circuit terminal 5 and the SDM occupant sensor serial data circuit terminal 58.
    • If greater then the specified range, test the circuit for a short to ground or an open/high resistance.
  5. Ignition ON, test for less than 1 volt between the serial data circuit terminal 5 and ground.
    • If greater then the specified range, test the circuit for a short to voltage.
  6. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the circuit for an open/high resistance. If the circuit fuse is open, test the circuit for a short to ground, if the circuit tests normal, replace the rollover sensor.
  7. With a scan tool, clear DTCs. Verify DTC B0090 is not set.
    • If DTC is set, replace the SDM.
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