system shutting down to save battery

[stevieboy]

i have a 2012 ford edge and after about 10 mins of driving the "shutting down to save battery" message comes on and shuts down the dash, radio, windows etc Vehicle stays running also  ............i tested the alternator and battery and seems to be good 

Edited January 10 by stevieboy

[1004ron]

The symptoms you describe point to a problem with the alternator and/or battery, so I'll ask how you went about testing both.

[Haz]

From the 2012 Edge Workshop Manual...

 

Battery Management System

 

Load Shed Strategy

NOTICE: When any vehicle module is being programmed, connect an external battery charger to make sure that the module programming is completed without the interruption due to the load shedding feature becoming active. The external battery charger must maintain a system voltage above 13 volts. This can require a charger setting higher than the lowest charge setting. The external battery charger negative connection must be made to an engine or vehicle chassis ground and not the negative battery terminal. If the connection is to the negative battery terminal, load shedding cannot be prevented from being invoked and module programming may be corrupted. After charging has begun, start the engine to clear any load shed states and then turn the engine off and proceed with programming.

 

NOTE: To maintain correct operation of the load shed, any electrical devices or equipment must be grounded to the chassis ground and not the negative battery terminal. A connection to the negative battery terminal can cause an inaccurate measurement of the battery state of charge and can cause incorrect load shed system operation.

This vehicle is equipped with a load shed strategy. 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. On vehicles equipped with Intelligent Access (IA) , the ignition state can also change.

 

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%, 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 system to save the remaining battery charge. Under this condition, a message may be displayed on the IPC or center stack display to alert the driver that battery protection actions are active.

 

When charging the vehicle battery by connecting the charger to the negative battery terminal is necessary, such as when using a combination battery charger and battery tester/analyzer, like the GR 1 190 V3.0 Intelligent Diagnostic Charger, the BCM will not immediately update the battery state of charge. In this instance, after charging, you must CARRY OUT the Battery Monitoring System (BMS) Reset using the scan tool. This reset is needed for proper engine off load shedding and to prevent invoking of engine off load shedding earlier than normal.

 

NOTE: If the reset is not carried out, when the battery is charged by connecting the charger to the negative battery terminal, 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 be displayed.

 

When charging the vehicle battery by connecting the charger to engine or chassis ground, the negative charger clamp must be connected to an unpainted chassis surface or a solid engine component such as a generator mount or engine lifting eye. In this instance, after charging, the BMS reset is not required if the ignition was ON during charging by above method. Through this method of charging, the BCM updates the battery state of charge during the charging process. If the ignition was OFF during charging by above method, a BMS reset may be required since the BCM does not update battery state of charge with ignition key OFF unless the vehicle is parked undisturbed for 8 hours.

 

Document download link> Charging System - Diagnosis and Testing - 2012 Edge-MKX Workshop Manual.pdf

 

Good luck!