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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 36 (Battery, Charging System And Starting System) >> Description and Operation >> Charging System Description and Operation >> Electrical Power Management (EPM) Overview >> Body Control Module (BCM)

Body Control Module (BCM)

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) is a class 2 device utilizing digital serial data links with other control modules. The BCM contains the EPM software and communicates with the ECM/PCM and the instrument panel cluster for EPM operation. The BCM determines the desired output voltage of the generator and sends the voltage command to the ECM/PCM for transmittal via the "L" terminal line to the regulator. The BCM also monitors the generator field duty cycle signal (F terminal) sent via the ECM/PCM. The BCM monitors the battery current sensor, the battery positive voltage, and estimated battery temperature to determine SOC. The BCM commands idle boost and load management operations, whenever battery discharge warrants it.

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