System Operation: Overview

The center of the front 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 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.

DTCs 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.