Circuit/System Description

The hybrid powertrain control module 2 activates the high voltage energy management communication enable circuit when the ignition power mode is in ON, SERVICE RUN, or START. The serial data communication enable circuit wakes up the battery energy control module for serial data communication.

The battery energy control module compares the high voltage energy management communication enable hardwire signal with a hybrid powertrain control module 2 serial data message indicating that the high voltage energy management communication enable signal is active. If the high voltage energy management communication enable hardwire signal is low when the serial data message indicates it should be high, then DTC P1EC1 is set.