Circuit/System Description

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the drive motor generator control module through serial data. The drive motor generator control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid battery assembly consists of 22 individual battery modules. Each battery module is rated at 12.0 volts. The batteries are connected together in a series circuit. The drive motor generator battery control module monitors the hybrid battery voltage on every two batteries for a total of 22 locations, across the battery assembly. The drive motor generator battery control module determines the actual terminal voltage by monitoring the output voltage from the high voltage contactors. The drive motor generator battery control module also multiplies each individual battery voltage measurement by 22, and compares this calculation to the terminal voltage measurement.

The drive motor generator battery control module monitors and compares these voltages using several different methods. The drive motor generator battery control module determines the calculated battery voltage by adding the voltage at the 22 locations together. The normal operating range for each battery module is 10-15 V. The normal operating range for the battery is 198-320 V.