Battery Energy Control Module
The BECM monitors the following to make sure that the MHEV battery operates within normal operational limits:
- MHEV battery module internal temperature
- MHEV battery module voltage.
The BECM has the following wiring harness connections:
- Power supply from the Rear Junction Box (BCMB).
- HS CAN power mode zero systems bus (quantity 2).
- Power Mode 6 (ignition ON) signal from the Body Control Module/Gateway Module (BCM/GWM).
- PWM signal to the MHEV battery electric cooling fan.
The BECM communicates with the PCM through the HS CAN power mode zero systems bus. The PCM controls the BISG to charge the MHEV battery when electrical energy is required.
For additional information, Refer to: BELT INTEGRATED STARTER GENERATOR
The BECM also controls the power available from the MHEV battery for the following:
- BISG
for auto stop/start engine starts and engine assist to increase fuel economy.
- For additional information, Refer to: BELT INTEGRATED STARTER GENERATOR
- DC/DC
.
- For additional information, Refer to: DIRECT CURRENT TO DIRECT CURRENT CONVERTER
- Electric supercharger.
- For additional information, refer to: SUPERCHARGER COOLING
The BECM contains a relay. The relay isolates the MHEV battery from the MHEV battery system, without having to remove any MHEV cables.
The BECM controls the MHEV battery electric cooling fan with a PWM signal. The duty cycle of the PWM is used to request the required cooling from the MHEV battery electric cooling fan.