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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0087 or B0088 >> Circuit/System Testing

Circuit/System Testing

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    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 B0087 is current, disconnect the LR SIS connector. If DTC B0088 is current, disconnect the RR SIS connector. Refer to SIS Replacement  in Repair Instructions for location of connector.
  2. Remove the SDM connector, refer to SDM Replacement  in Repair Instructions for location of 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 B0087 was current replace the LR SIS. If DTC B0088 was current replace the RR SIS. After replacement refer to Repair Verification.
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