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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 385 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0074CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C

Circuit/System Testing

2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT:
    • The passenger presence sensor is not serviced separately. The PPS replacement with the passenger presence 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:
      • Passenger presence sensor
      • Passenger presence module
      • Passenger presence sensor wiring harness connector
      • Passenger presence module wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the passenger presence module 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 1 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 passenger presence module.
    • If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the passenger presence module.
    3. IMPORTANT:

    The AIR BAG BATT Fuse that supplies B+ voltage must be removed to ensure the passenger presence module is inactive. An active passenger presence module may cause inaccurate resistance readings.

  3. Ignition OFF, remove the AIR BAG BATT Fuse. Test for less than 2.0 ohms between low reference terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the passenger presence module.
  4. Ignition OFF, disconnect the harness connector at the passenger presence module.
  5. Test for infinite resistance between the signal circuit terminal 6 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 2 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage.
  7. If all circuits test normal, replace the passenger presence module.
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