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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 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 low reference 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.
  3. Ignition ON, using a scan tool, verify the SDM Driver Seat Belt Switch parameter display is Buckled.
    • If the parameter is Unbuckled, test the seat belt switch signal circuit for a short to ground. If the circuit tests normal replace the SDM.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the SDM Driver Seat Belt Switch parameter display is Unbuckled.
    • If the parameter is Buckled, test the signal and the low reference circuits for open/high resistance or a short to voltage. If the circuits test normal, replace the SDM.
  5. If all circuits test normal, test or replace the seat belt switch.
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