LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 77 (Seat Belt System) >> Diagnostic Information and Procedures >> Seat Belt Indicator Circuit Malfunction - Driver >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
    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 seat belt switch
    • The SDM module
    • The seat belt switch left wiring harness connector
    • The SDM wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the seat belt switch.
  2. Test the resistance between the switch ground circuit terminal B (buckle side) and switch signal circuit terminal A (buckle side) while connecting and disconnecting the seat belt. The resistance should switch between infinity and less than 5 ohms.
    • If the resistance does not switch as indicated, replace the seat belt buckle.
  3. Verify a test lamp illuminates between the switch ground circuit terminal B (harness side) and B+.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  4. Ignition OFF, disconnect the harness connector at the SDM.
  5. Ignition ON, test for less than 1 volt between the SDM seat belt switch signal circuit terminal A14 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage.
  6. Test for infinite resistance between the SDM seat belt switch signal circuit terminal A14 and ground
    • If less than the specified value, test the signal circuit for a short to ground.
  7. Test for less than 2 ohms of resistance in the seat belt switch signal circuit between SDM harness connector terminal A14 and the seat belt switch harness connector terminal A.
    • If greater than the specified range, test the signal circuit for an open/high resistance.
  8. If the circuits test normal, replace the SDM.
scientia non olet · About LEMON Manuals