Theory Of Operation

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The Battery Pack Control Module (BPCM) is contained within the Primary High Voltage Battery Pack. The BPCM provides battery management and system functionality in conjunction with Cell Supervision Circuits (CSCs) that monitor and balance the battery cells as well as the monitoring of related external support systems. The CSCs are also located within the High Voltage Battery Pack. The BPCM is the High Voltage Interlock (HVIL) power source and communicates with the vehicle via CAN-C bus. The main functions of the BPCM are high-voltage bus and pre-charge contactor control, battery pack current, voltage and temperature sensing, CAN communication, fault detection and reporting. Diagnosing any DTC related to the BPCM should start with verifying that all fuses, wiring and connections critical to proper system operations are in good repair, securely installed and connected.