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Engine Running Load Shed

When the BCM and/or PSCM voltage is low, with the engine running, a message is sent by the BCM to either minimize or shut down the climate controlled seats, rear defrost, heated mirrors and DATC blower motor to improve system voltage. Under this condition, the IPC message center displays either LOW BATTERY LESS FEATURES (base message center) or LOW BATTERY FEATURES TEMPORARILY TURNED OFF (optional message center) to notify the driver that battery protection actions are active.

For more information on message center messages, Refer to the Owner's Literature or Refer to: MESSAGE CENTER - SYSTEM OPERATION AND COMPONENT DESCRIPTION .

There are 3 states of engine running load shed: 

Load Shed State Entry Conditions Impact to Features Clear Conditions
Load shed 1 If vehicle speed is below 16 km/h (10 mph)  , and voltage to the PSCM is less than 11.5 volts or the PSCM measures current draw greater than 0 amps. If vehicle speed is above 16 kp/h (10 mph)  , and the voltage to the BCM is less than 11.6 volts. These loads are incrementally reduced (if equipped): Heated steering wheel and climate controlled seats. These loads are turned off (if equipped): smart trailer tow battery charge, heated mirrors, heated backglass, and heated windshield. Voltage to the BCM is greater than 12.7 volts or  the generator field duty cycle is less than 88%.
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.
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