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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 108 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B0072 OR B0073CIRCUIT/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 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • The seat belt switch is not serviced separately. The seat belt retractor with the seat belt switch 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 SDM module
    • The seat belt switch wiring harness connector
    • The seat belt switch
    • The SDM wiring harness connector
  1. Ignition OFF, disconnect the seat belt switch connector.
  2. Test for less than 1.0 ohm 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 SDM.
  3. Ignition ON. Test for 1.0 - 1.6 volts between the signal circuit terminal A and ground.
    • If less that the specified range, test the signal circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the SDM.
    • If greater that the specified range, test the signal circuit for a short to voltage.
  4. If the circuits test normal, replace the seat belt retractor.
RENDER: 1.0x

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