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Circuit/System Testing

  1. Ignition ON, disconnect the battery current sensor.
  2. Measure the voltage of the 5 volt reference circuit terminal A. Verify that the 5 volt reference circuit measures 5 volts.
    • If the voltage is less than 5 volts, test the current sensor 5 volt reference circuit for a short to ground, a high resistance, or an open circuit. If the circuit tests normal, replace the BCM.
  3. Measure the voltage of the between the 5-volt reference circuit terminal A and the low reference circuit terminal B. Verify that there is 5 volts between the 5-volt reference circuit and the low reference circuit.
    • If the voltage is less than 5 volts, test the current sensor low reference circuit for a high resistance, or an open circuit. If the circuit tests normal, replace the BCM.
  4. Measure the voltage of the signal circuit terminal C. Verify that the signal circuit measures 4-6 volts.
    • If the signal circuit voltage is less than 4 volts, test the current sensor signal circuit for a short to ground, a high resistance, or an open circuit. If the circuit tests normal, replace the BCM.
    • If the signal circuit voltage is greater than 6 volts, test the current sensor signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all 3 circuits test normal, replace the battery current sensor.
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