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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0071 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
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.
  1. Ignition ON, with a scan tool verify the PPS Seat Belt Tension Sensor parameter is between 0.5-4.5 volts.
    • If the voltage is greater than 4.5 volts and less than 5 volts. Replace the seat belt tension sensor.
    • If the voltage is greater than 0.0 volts and less than.5 volts. Replace the seat belt tension sensor.
    • If the voltage is 0.0 volts or greater than 5 volts, proceed to the next step.
    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 tension sensor
    • The PPS module
    • The seat belt tension sensor wiring harness connector
    • The PPS module wiring harness connector
  2. Ignition OFF, disconnect the seat belt tension sensor connector and inspect the component and harness sides for damage or corrosion.
    • If damage or corrosion is found, repair or replace as necessary.
  3. Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal A 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.
    IMPORTANT: The AIR BAG Fuse that supplies B+ voltage must be removed to ensure the PPS module is inactive. An active PPS module may cause inaccurate resistance readings.
  4. Ignition OFF, remove the AIRBAG Fuse. Test for less than 2.0 ohm of resistance between low reference terminal B and ground.
    • If greater than specified, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the PPS.
  5. Ignition OFF, disconnect the PPS module connector.
  6. Ignition ON, test for less than 0.1 volt between the voltage reference circuit terminal A of the sensor and ground.
    • If greater that the specified range, test the voltage reference circuit for a short to voltage.
  7. Test for infinite resistance between the voltage reference circuit terminal A of the sensor and ground.
    • If less than the specified value, test the voltage reference circuit for a short to ground.
  8. Test for less than 1.0 ohm of resistance in the seat belt sensor signal circuit between the PPS module terminal 4 and belt tension sensor terminal C
    • If greater that the specified range, test the voltage reference circuit for an open/high resistance.
  9. If all circuits test normal, replace the PPS.
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