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Home >> Pontiac >> 2009 >> Torrent Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC B1405 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac Torrent and 2008 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the battery current sensor.
  2. Test for less than 1 ohm between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high. If the circuit tests normal, replace the BCM.
  3. Ignition ON, test for 5 volts between the 5-volt reference circuit terminal A and ground.
    • 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.
  4. Test for 5 volts between the signal circuit and ground.
    • If less than 5 volts, test the signal circuit terminal C for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the battery current sensor.
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