Circuit/System Description

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

The drive motor generator battery has four hybrid battery temperature sensors. The hybrid battery temperature sensors are located on the top of the hybrid batteries. The temperature sensor is a variable resistor that measures the temperature of the hybrid batteries. The drive motor generator battery control module (BECM) supplies 5 V to the signal circuit and a ground for the low reference circuit. The hybrid battery temperature sensor resistance changes with battery temperature. The lower the temperature, the higher the resistance of the sensor. The higher the temperature, the lower the resistance of the sensor. The drive motor generator battery control module uses the battery temperature sensors to control the battery cooling fan operation.

The hybrid powertrain control module monitors the average battery pack temperature over serial data. When the average drive motor generator battery temperature exceeds the calibrated temperature the hybrid powertrain control module will set DTC P0A7E and send a command to the drive motor generator battery control module to open the high voltage contactors.