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Engine Running Load Shed

When the BCM  and/or PCM  voltage is low, with the engine running, the BCM  sends a message to either minimize or shut down the climate controlled seats, rear defrost, heated mirrors and climate control blower motor to improve system voltage. Under this condition, the IPC  message center displays LOW BATTERY FEATURES TEMPORARILY TURNED OFF to notify the driver that battery protection actions are active during a Load Shed 2 continuous event.

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 PCM  is less than 11.5 volts.
  • If vehicle speed is below 16 km/h (10 mph) and PCM  measures current draw greater than 0 amps.
  • If vehicle speed is above 16 km/h (10 mph) and Voltage to the BCM  is less than 11.6 volts.
 If equipped, the climate controlled seats will switch from HIGH to MED. If they are already at MED, the state will not change. Voltage to the BCM  is greater than 12.7 volts or the generator field duty cycle is less than 88%.
Load shed 2 transient
  • Voltage to the PCM  is less than 11.0 volts.
  • PCM  measures current draw greater than 20 amps.
  • If equipped, climate controlled seats are disabled, but the indicators remain illuminated.
  • If equipped, rear defrost and heated mirrors are disabled, but the indicator remains illuminated.
 Voltage to the BCM  is greater than 12.4 volts.
Load shed 2 continuous Vehicle was in load shed 2 transient state for greater than 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 Dual Automatic Temperature Control (DATC), the blower motor speed is reduced to 50% and the blower speed indicator reflects this.
  • If equipped, DC/AC inverter (AC powerpoint) is disabled.
  • The base message center displays LOW BATTERY LESS FEATURES.
  • The optional 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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