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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 977 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0072 or B0073 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. 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.
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