12 V Starting and Charging 5-11
Function
Battery Temperature
Calculation
Battery Voltage
Calculation
Amp-Hour
Calculation Action Taken
Load Shed 2 End — Greater Than 12.6 V
Battery has a net loss
of less than 10.5 AH
Clear Load Shed 2
Load Shed 3 Start — Less Than 11.9 V
Battery has a net loss
greater than 20 AH
Rear Defrost, Heated
Mirrors, Heated Seats
cycled OFF for 100% of
their cycle. The
BATTERY SAVER
ACTIVE message will
be displayed on
the DIC
Load Shed 3 End — Greater Than 12.6 V
Battery has a net loss
of less than 15 AH
Clear Load Shed 3
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 operatio n 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 incrementa l 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
Battery Temperature
Calculation
Battery Voltage
Calculation
Amp-Hour
Calculation Action Taken
Idle Boost 1 Start Less Than −15°C (5°F) Less Than 13 V —
First level Idle boost
requested
Idle Boost 1 Start — —
Battery has a net loss
greater than 0.6 AH
First level Idle boost
requested
Idle Boost 1 Start — Less Than 10.9 V —
First level Idle boost
requested
Idle Boost 1 End
Greater Than
−15°C (5°F)
Greater Than −12 V
Battery has a net loss
less than 0.2 AH
First level Idle boost
request cancelled
Load Shed 1 Start — —
Battery has a net loss
of 4 AH
Rear Defrost, Heated
Mirrors, Heated Seats
cycled OFF for 20% of
their cycle
Load Shed 1 Start — Less Than 10.9 V —
Rear Defrost, Heated
Mirrors, Heated Seats
cycled OFF for 20% of
their cycle
Load Shed 1 End — Greater Than 12 V
Battery has a net loss
of less than 2 AH
Clear Load Shed 1
Idle Boost 2 Start — —
Battery has a net loss
greater than 1.6 AH
Second level Idle boost
requested
2021 - Silverado 4500HD, 5500HD, and 6500HD Electrical Body Builder Manual
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