Electrical Load Management

The Body Control Module/Gateway Module (BCM/GWM) assembly contains the electrical load management. The electrical load management uses the Intelligent Power Management System (IPMS) functionality and is based on Battery Monitoring System (BMS) sensor inputs. The BCM/GWM assembly will monitor the vehicle system power loads before and during an auto engine stop.

Before an auto engine stop, the BCM/GWM assembly will transmit a signal to the system control modules on all Controller Area Network (CAN) buses. The BCM/GWM assembly requests a power save on all electrical loads and set a minimum electrical value override. The BCM/GWM assembly monitors the vehicle electrical loads. It will inhibit an auto engine stop until the load current is at a value low enough to be supported by the battery. If the electrical loads cannot be reduced sufficiently, the BCM/GWM assembly will inhibit the auto engine stop.

When the engine is stopped after an auto engine stop, the BCM/GWM assembly will continue to monitor the battery state of charge. If battery voltage falls below 11.0 V, the BCM/GWM assembly will initiate an engine start. The 11.0 V is a level which will result in degraded starting performance or possible battery damage.