Load shed 2 transient | PSCM indicating reduced voltage and increased current. System voltage less than 11 volts | If equipped, climate controlled seats are disabled, but the indicators remain illuminated. If equipped, rear defrost and heated mirrors are disabled, but the indicator remain illuminated. | Voltage to the BCM is greater than 12.4 volts. |
Load shed 2 continuous | Load Shed 2 Transient condition in excess of 20 seconds | If equipped, climate controlled seats are disabled and the indicators are off. If equipped, rear defrost and heated mirrors are disabled and the indicator is off. If equipped with DATC, the blower motor is reduced to 50% speed. If equipped, DC/AC inverter (AC powerpoint) is disabled. The base IPC message center displays LOW BATTERY LESS FEATURES. The optional IPC message center displays LOW BATTERY FEATURES TEMPORARILY TURNED OFF. | Voltage to the BCM is greater than 12.4 volts for more than 60 seconds. |
Battery Charging
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 . Through this method of charging the BCM updates the battery state of charge during the charging process.
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 does not immediately update the battery state of charge. In this instance, the BMS Reset must be carried out using a diagnostic scan tool. This reset is needed for proper engine off load shedding and to prevent invoking of engine off load shedding earlier than normal.
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.
Jump Starting
When it is necessary to jump start the vehicle it is important to connect the cables properly in order for the Electrical Energy Management system to measure the energy input to the system to keep an accurate state of charge. Connect the positive cable to the battery positive post and the jump start negative cable to a vehicle ground. Do not connect to the negative battery terminal. Connecting directly to the battery negative post bypasses the ability of the vehicle to measure the input current, and does not adjust the battery state of charge accordingly. For a good connection point, follow the negative cable from the battery monitoring sensor to the vehicle body connection (typically on the shock tower sheet metal). If the vehicle was improperly jump started, the Electrical Energy Management system calibrates the battery state of charge after about 8 hours.
Battery Replacement
If the vehicle battery is replaced, it is very important to perform the BMS Reset using a diagnostic scan tool. If the BMS Reset is not carried out, it holds the old battery parameters and time in service counter in memory. Additionally it tells the system the battery is in an aged state and may limit the Electrical Energy Management system functions. For more information,
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.