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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 - Passenger >> 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.

Indicator Circuit Test.

    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 IPC
    • The Passenger Air Bag ON/OFF indicator
    • The SDM module
    • The IPC wiring harness connector
    • The Passenger Air Bag ON/OFF indicator wiring harness connector
    • The SDM wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the inflatable restraint passenger air bag ON/OFF indicator.
  2. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the inflatable restraint passenger air bag ON/OFF indicator.
  3. Connect a test lamp between the passenger seat belt indicator control circuit terminal 5 and the ignition circuit terminal 4.
    4. IMPORTANT: Allow 5 seconds after seat is occupied for test lamp to change states.
  4. With the passenger seat occupied the test lamp should turn ON with the seat belt disconnected, and turn OFF with the seat belt connected.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the IPC.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the IPC.
  5. If the circuits test normal, replace the inflatable restraint passenger air bag ON/OFF indicator.

Switch Circuit Test

    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 seat belt switch harness connector
    • The SDM
    • The SDM harness connector
  1. Ignition OFF, disconnect the harness connector at the seat belt switch.
  2. Test the resistance between the ground circuit terminal B and signal circuit terminal A of the switch (buckle side) while connecting and disconnecting the seat belt. The resistance should switch between infinity and less than 2 ohms.
    • If not as specified, 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 A16 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 A16 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 A16 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.
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