Circuit/System Description

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The auxiliary power module (APM) current sensor is used for over current limitation (less than 150 A). The current sensor is soldered on the control board, near the APM 12-volt bus bar. The starter/generator control module (SGCM) monitors the current sensor for the following:

To detect the failure of the APM current sensor circuit (high).
To detect the failure of the APM current sensor circuit (low).

If one of the above conditions is detected, the SGCM will set the appropriate DTC.