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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1230 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0071 >> Circuit/System Testing
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Circuit/System Testing

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IMPORTANT: The seat belt tension sensor is not serviced separately. The seat belt buckle replacement with the seat belt tension sensor must be serviced as a complete unit.
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 tension sensor
  • The PPS module
  • The seat belt tension sensor wiring harness connector
  • The PPS module wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the seat belt tension sensor and inspect the component and harness sides for damage or corrosion.
    • If damage or corrosion is found, repair or replace as necessary.
  2. Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal B and ground.
    • If less that the specified range, test the voltage reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the PPS.
    • If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the PPS.
    3. IMPORTANT: The AIR BAG BATT Fuse must be removed to ensure the PPS module is inactive. An active PPS module may cause inaccurate resistance readings.
  3. Ignition OFF, remove the AIR BAG BATT Fuse in the underhood fuse block. Test for less than 2.0 ohms between low reference terminal A and ground.
    • If greater than specified, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the PPS.
  4. Ignition OFF, disconnect the harness connector at the PPS module.
  5. Ignition ON, test for infinite resistance between the signal circuit terminal C and ground.
    • If less than the specified range, test the signal circuit for a short to ground.
  6. Ignition ON, test for less than 1 volt between the signal circuit terminal C and ground.
    • If greater than the specified range, test the circuit for a short to voltage
  7. Test for less than 1 ohm in the signal circuit between the PPS module terminal 4 and the belt tension sensor terminal C
    • If greater than specified, test the signal circuit for open/high resistance. If the circuit tests normal, replace the PPS.
  8. If all circuits test normal, replace the passenger seat belt buckle which includes the seat belt tension sensor.
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