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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1638 (Hybrid Energy Storage System - 3.6L (Hp5)) >> Diagnostic Information and Procedures >> DTC P1A0C or P1A0D >> Circuit/System Description

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 the serial data communication circuit. The drive motor generator control module is the host controller for diagnostic trouble code (DTC) information.

The drive motor generator battery control module continuously monitors the system voltage circuit. Low or higher than normal ignition voltage may be inadequate for operation of the energy storage components. Improper operation may cause erratic hybrid drive motor generator battery operation that could include a no start condition. A system over voltage longer than 8 minutes will cause the HV contactors coils to get hot. The drive motor generator battery control module will open the contactors. This will open the high voltage contactors when vehicle speed is below a calibrated value will not close them for 30 minutes in order to allow the contactors to cool.

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