Circuit/System Description: Notes
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs). Each MCM measures hybrid battery high voltage with several internal sensors. The battery energy control module (BECM) also monitors high voltage with several internal sensors. The BECM high voltage measurement is broadcast over GMLAN.