Engine Off Load Shed

The Body Control Module (BCM) uses the battery current sensor to keep track of the battery state of charge. The battery current sensor is a Hall-effect sensor attached to the battery ground cable. When the engine is off, and the Body Control Module (BCM) determines the battery state of charge is below 40% or 10% of the charge has been drained or 45 minutes have elapsed, a load shed message is sent over the Controller Area Network (CAN). This message turns off the audio/navigation system to save the remaining battery charge. Under this condition the Front Control/Display Interface Module (FCDIM) (without touchscreen controls) displays SYS OFF TO SAVE BATT or the Front Display Interface Module (FDIM) (with touchscreen controls) displays BATTERY SAVER - SYSTEM OFF PLEASE START THE ENGINE to notify the driver that battery protection actions are active.

Engine off load shedding occurs when the engine is not running and the ignition is in the ACC, RUN or delayed accessory position. This load shed state will clear once the vehicle has been started and battery state of charge allowed to recover. If the engine off load shed occurs, the audio/navigation system turns off.

When the ignition is in the RUN position and if load shed occurs, the Instrument Panel Cluster (IPC) message center may display either TURN POWER OFF TO SAVE BATT (base message center) or TURN POWER OFF TO SAVE BATTERY (optional message center). The audio/navigation system will shut down after the message center displays it's warning.

If a fault occurs with the battery current sensor or circuit(s), the only engine off load shed strategy that will be active is a 45 minute timer. After 45 minutes have elapsed, the audio/navigation system turns off. To clear the load shed state, restart the engine

For charging the vehicle battery, REFER to BATTERY CHARGING .

If the vehicle battery is charged by connecting the battery charger to the battery negative terminal or the battery is replaced  , CARRY OUT the Battery Monitoring System(BMS) Reset using the scan tool. If the Battery Monitoring System(BMS) Reset is not carried out, it takes approximately 8 hours for the Body Control Module (BCM) to learn the new battery state of charge. During this 8 hour period, the vehicle must be undisturbed, with no doors opened or keyless entry button presses. If the vehicle is used before the Body Control Module (BCM) is allowed to learn the new battery state of charge, engine off load shedding can still occur and a message may be displayed.

If the vehicle battery is charged by connecting the battery charger the engine or chassis ground  , the Battery Monitoring System(BMS) Reset using the scan tool is not necessary.

If the vehicle has been jump started  , TEST the battery condition. REFER to DIAGNOSTIC ROUTINE A .