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Circuit/System Testing

  1. Ignition OFF, disconnect the IGN MAIN relay 31.
  2. Connect a test lamp between the relay control circuit and ground.
  3. Cycle the ignition ON and OFF. The test lamp should turn ON and OFF when changing ignition switch positions.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the IGN MAIN relay 31.
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