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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1544 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0091 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: When removing the connectors, inspect for damage or corrosion. Damage or corrosion to the following requires repair or replacement of the affected component/connector:
    • Front end sensor
    • SDM module
    • Front end sensor wiring harness connector
    • SDM wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the front end sensor and the SDM X2.
  2. Ignition ON, test for less than 1 V between the front end sensor signal circuit terminal 1 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage.
  3. Ignition ON, test for less than 1 V between the front end sensor low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage.
  4. Test for infinite resistance between the front end sensor signal circuit terminal 1 and ground.
    • If less than the specified value, test the signal circuit for a short to ground.
  5. Test for infinite resistance between the front end sensor low reference circuit terminal 2 and ground.
    • If less than the specified value, test the low reference circuit for a short to ground.
  6. Test for less than 1 Ω between the SDM signal circuit terminal 23 X2 and the front end sensor circuit terminal 1 harness connector.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  7. Test for less than 1 Ω between the SDM low reference circuit terminal 24 X2 and the front end sensor circuit terminal 2 harness connector.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  8. If all circuits test normal, test or replace the front end sensor.
  9. Reconnect all SIR components. Ignition ON, verify the DTC is not set as current.
    • If the DTC resets as current, replace the SDM.
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