Engine Off Load Shed

The 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 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 CAN. This message turns off the audio/navigation system to save the remaining battery charge. Under this condition the FCDIM  (without touchscreen controls) displays SYS OFF TO SAVE BATT or the 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 clears once the vehicle has been started and the battery state of charge recovers. 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 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 shuts down after the message center displays the warning.

If a fault occurs with the battery current sensor or circuit(s), the only engine off load shed strategy that is 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 BMS Reset using the scan tool. If the BMS Reset is not carried out, it takes approximately 8 hours for the 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 BCM is allowed to learn the new battery state of charge, engine off load shedding can still occur and a message may display.

If the vehicle battery is charged by connecting the battery charger to the engine or chassis ground  , the 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 .