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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 Dual Automatic Temperature Control (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.

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): 
  • Voltage to the PSCM  is less than 11.5 volts.
  • PSCM  measures current draw greater than 0 amps.

    If vehicle speed is above 16 kp/h (10 mph): 

  • Voltage to the BCM  is less than 11.6 volts.
 Climate controlled seats switch from HIGH to MED. If the are already at MED, the state does 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 PSCM  is less than 11.0 volts.
  • PSCM  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 remain 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 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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