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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (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 Cadillac DTS. 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, disconnect the appropriate SIS connector.
  2. Remove the SDM connector.
  3. Test for infinite resistance between the signal circuit and ground.
    • If less than infinite resistance, test the circuit for a short to ground.
  4. Ignition ON, test for less than 1 volt between the SIS signal circuit and ground.
    • If greater than the specified range, test the circuit for a short to voltage.
  5. Ignition ON, test for less than 1 volt between the SIS voltage circuit and ground.
    • If greater than the specified range, test the circuit for a short to voltage.
  6. Test for less then 1 ohm of resistance between the signal circuit SIS connector and SDM connector.
    • If greater than the specified range, test the circuit for an open/high resistance.
  7. Test for less then 1 ohm of resistance between the voltage circuit SIS connector and SDM connector.
    • If greater than the specified range, test the circuit for an open/high resistance.
  8. If the circuits test normal, replace the appropriate SIS.
  9. Reconnect all SIR components. Ignition ON, with a scan tool clear and recheck for DTCs.
    • If the SIS DTC returns and is current, replace the SDM.
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