Front Electric Drive Assembly - System Operation and Component Description: Overview

The center of the electric motor control system is a control module called the Secondary Inverter System Controller (S-ISC), also known as the SOBDMB. The Secondary Inverter System Controller (S-ISC) receives inputs from sensors and other electronic components. Based on information received and programmed into its memory, the Secondary Inverter System Controller (S-ISC) generates output signals to control the secondary electric drive (electric All Wheel Drive), the auxiliary cooling pump, and the (secondary) front electric drive assembly oil pump.

The Secondary Inverter System Controller (S-ISC) can only power-up if the primary ISC powers-up and closes its power-sustain relay (PSR).

Some failure modes require a complete power-down and restart of the Secondary Inverter System Controller (S-ISC) to recover. To ensure a complete module power-down, you must wait several minutes after key-off, or monitor the Secondary Inverter System Controller (S-ISC) communication to determine if the module has completely shut down.

DTC s refer to the "generator" for the Secondary (S-ISC) and "motor" for the primary ISC. The parts operate largely in the same manner despite the different naming convention.