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 DTC information.

The hybrid battery current sensor is mounted inside the drive motor battery disconnect control module. The positive high voltage cable that goes to the positive contactor passes through the current sensor. The current sensor detects the amperage that flows in and out of the hybrid batteries. The drive motor generator battery control module supplies and monitors a 5 V reference signal to the current sensor. The current sensor returns a signal between 0 and 5 V to the drive motor generator battery control module. The current sensor signal is in proportion to the amperage going in and out of the drive motor generator battery. A signal voltage of the current sensor greater than 2.5 V indicates that the drive motor generator battery is being discharged and a signal voltage less than 2.5 V indicates charging. The hybrid battery current sensor measures from -200 to +200 A.