- Honda Car Owner's Manual

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BATTERYCONDITIONMONITOR(BCM)
The BatteryConditionMonitorModule(BCM) monitorstheconditionofthemainbattery,viafour
temperature sensors and 10 voltage sensors in the Battery Module. It also uses one current sensor to
determinerateofcharge/discharge,andsuppliesinformationtotheMotorControlModule.
TheBCMmaintainstheIMAbatterystateofchargeinarangeof20%to80%,whichoptimizesbattery
life.Itneverallowsthebatterytobecomefullychargedorfullydischarged.
TheBatteryConditionMonitoralsocontrolstheoperationofthe2-speedcoolingfan,locatedonthe
outsideofthebatterymodule.Relaysandaresistorthatmaketwodifferentspeedspossible,arelocatedon
theJunctionBoard.theBatteryConditionMonitorcheckstheconditionofthebatterybymonitoringthe
following:
• CalculationofStateofCharge(SOC)
• Batteryprotectionneeds
• Batterytemperature
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