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

Function
Load Shed 2 End
Load Shed 3 Start
Load Shed 3 End
Electrical Power Management
Description and Operation (Diesel)
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.
The idle boost operation is a means of improving
generator performance during a low voltage or low
battery state-of-charge condition. Idle boost consists of
three steps: idle boost 1, idle boost 2, and idle boost 3
(approximately 750, 900, and 1050 rpm respectively).
Idle boost is activated in incremental steps, idle boost 1
must be active before idle boost 2 can be active.
Each electrical power management function, either idle
boost or load shed, is discrete. No two functions are
active at the same time. The criteria used by the body
control module (BCM) to regulate electrical power
management are outlined below:
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
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual
Battery Temperature
Calculation
Battery Temperature
Calculation
Less Than 15°C (5°F)
Greater Than
15°C (5°F)
12 V Starting and Charging
Battery Voltage
Calculation
Battery has a net loss
Greater Than 12.6 V
of less than 10.5 AH
Battery has a net loss
Less Than 11.9 V
greater than 20 AH
Battery has a net loss
Greater Than 12.6 V
of less than 15 AH
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
Amp-Hour
Calculation Action Taken
Clear Load Shed 2
Rear Defrost, Heated
Mirrors, Heated Seats
cycled OFF for 100% of
their cycle. The
BATTERY SAVER
ACTIVE message will
be displayed on
Clear Load Shed 3
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
5-11
the DIC
requested
requested
requested
their cycle
their cycle
requested