Electrical Power Management Description And Operation (Gasoline) - Chevrolet Silverado 4500HD Manual

5-10 12 V Starting and Charging
Electrical Power Management
Description and Operation (Gasoline)
The electrical power management is used to monitor
and control the charging system and alert the driver of
possible problems within the charging system. The
electrical power management system makes the most
efficient use of the generator output, improves the
battery state of charge, extends battery life, and
manages system electrical loads.
The load shed operation is a means of reducing
electrical loads during a low voltage or low battery
state of charge condition.
Function
Idle Boost 1 Start
Idle Boost 1 Start
Idle Boost 1 Start
Idle Boost 1 End
Load Shed 1 Start
Load Shed 1 Start
Load Shed 1 End
Idle Boost 2 Start
Idle Boost 2 Start
Idle Boost 2 End
Idle Boost 3 Start
Idle Boost 3 Start
Idle Boost 3 End
Load Shed 2 Start
Load Shed 2 Start
Battery Temperature
Calculation
Less Than 15°C (5°F)
Greater Than
15°C (5°F)
The idle boost operation is a means of improving
generator performance during a low voltage or low
battery state of charge condition.
Each electrical power management function, either idle
boost or load shed, is discrete. No two functions are
active at the same time. Idle boost is activated in
incremental steps, idle boost 1 must be active before
idle boost 2 can be active. The criteria used by the body
control module (BCM) to regulate electrical power
management are outlined below:
Battery Voltage
Calculation
Less Than 13 V
Battery has a net loss
greater than 0.6 AH
Less Than 10.9 V
Battery has a net loss
Greater Than 12 V
Battery has a net loss
Less Than 10.9 V
Battery has a net loss
Greater Than 12 V
Battery has a net loss
greater than 1.6 AH
Less Than 10.9 V
Battery has a net loss
Greater Than 12 V
Battery has a net loss
Less Than 10.9 V
Battery has a net loss
Greater Than 12 V
of less than 6.0 AH
Battery has a net loss
Less Than 10.9 V
greater than 12 AH
Less Than 10.9 V
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual
Amp-Hour
Calculation Action Taken
First level Idle boost
First level Idle boost
First level Idle boost
First level Idle boost
less than 0.2 AH request cancelled
Rear Defrost, Heated
Mirrors, Heated Seats
of 4 AH cycled OFF for 20% of
Rear Defrost, Heated
Mirrors, Heated Seats
cycled OFF for 20% of
Clear Load Shed 1
of less than 2 AH
Second level Idle boost
Second level Idle boost
Second level Idle boost
less than 0.8 AH request cancelled
Third level Idle boost
of 10.0 AH
Third level Idle boost
Third level Idle boost
request cancelled
Rear Defrost, Heated
Mirrors, Heated Seats
cycled OFF for 50% of
their cycle. The
BATTERY SAVER
ACTIVE message will
be displayed on
Rear Defrost, Heated
Mirrors, Heated Seats
cycled OFF for 50% of
their cycle. The
BATTERY SAVER
ACTIVE message will
be displayed on
requested
requested
requested
their cycle
their cycle
requested
requested
requested
requested
the DIC
the DIC