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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1040 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC B1516 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  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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