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Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that the current sensor is mounted correctly on the negative battery cables. The sensor should be installed with the coil around the negative battery cables, with the tape tab pointing away from the battery.
  2. Ignition OFF, disconnect the battery current sensor.
  3. Ignition OFF and scan tool disconnected, remove the 30A IBCM 1 fuse 20 from the underhood fuse block, and wait 45 seconds. Test for less than 5 ohms between the low reference circuit terminal B and ground.
    • If greater than the specified value, test the current sensor low reference circuit and the BCM ground circuits for an open/high resistance. If the circuits test normal, replace the BCM.
  4. Ignition ON, test for 4.5-5.5 volts on the 5-volt reference circuit terminal A.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. Ignition ON, test for 4.5-5.5 volts on the signal circuit terminal C.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  6. If all circuits test normal, replace the battery current sensor.
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