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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seat Belt System >> Diagnostic Information and Procedures >> Seat Belt Indicator Malfunction - Driver >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

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. Ignition ON, 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.
    • If not as specified, replace the seat belt buckle.
  3. Ignition OFF, reconnect the harness connector at the seat belt switch.
  4. Make sure the seat belt is buckled.
  5. 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.
  6. Make sure the seat belt is unbuckled.
  7. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B (harness side). 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.
  8. If all circuits test normal, test or replace the seat belt switch.
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