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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 855 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0085 or B0086 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. 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 SIS
    • The SDM module
    • The SIS wiring harness connector
    • The SDM wiring harness connector
  1. Ignition OFF, if DTC B0085 is current, disconnect the LF SIS connector. If DTC B0086 is current, disconnect the RF SIS connector.
  2. Remove the SDM connector.
  3. Test the signal and voltage circuits between the SDM and SIS for a short to voltage, short to ground, or open/low resistance. Verify that a short to voltage, short to ground, or open/low resistance does not exist.
    • If any of the above conditions are found, make the appropriate repair.
  4. Reconnect all SIR components, then ignition ON use the scan tool to clear the DTCs then recheck for DTCs.
    • If DTC B0085 was current, replace the LF SIS. If DTC B0086 was current, replace the RF SIS. After replacement, refer to Repair Verification .
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