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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    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
  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 5-volt reference circuit terminal A and ground.
    • If less that the specified range, test the 5-volt 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 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the PPS.
    3. 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.
  3. Ignition OFF, remove the AIRBAG Fuse. Test for less than 2.0 ohms between the low reference terminal B and ground.
    • If greater than the specified range, 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. Test for infinite resistance between the signal circuit terminal C and ground.
    • If less than the specified value, 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 signal circuit for a short to voltage.
  7. Test for less than 1 ohm in the signal circuit between PPS module terminal 4 and belt tension sensor terminal C.
    • If greater than the specified range, 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.
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