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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 B1370 >> 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 SDM module
    • The SDM wiring harness connector
  1. Ignition OFF, disconnect the harness connector at the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Connect a test lamp between the ignition 1 voltage circuit terminal 32 and ground.
  3. Cycle the ignition switch between the RUN and OFF positions. The test lamp should turn ON and OFF as the switch is cycled.
    • If the test lamp is always ON, test the ignition 1 voltage circuit of the SDM and the control circuit of the Run/Crank relay for a short to voltage. If the circuits test normal, replace the Run/Crank relay.
    • If the test lamp is always OFF, test the ignition 1 voltage circuit of the SDM and the control circuit of the Run/Crank relay for an open or short to ground. If the circuits test normal, replace the Run/Crank relay.
  4. Test or replace the SDM.
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