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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC B1390 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X-1 harness connector at the BCM.
  2. Verify that there is less than a 2 volt difference between the battery positive voltage circuit terminal 51 and the ground circuit terminal 19, and between the battery positive voltage circuit terminal 52 and the ground circuit terminal 17.
    • If greater than the specified range, test the voltage circuits for a short to ground or open/high resistance, and the ground circuits for open/high resistance.
  3. If the circuits test normal, replace the BCM.
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