hvac Ram 1500 2020 Owner's Manual

GETTING TO KNOW YOUR INSTRUMENT PANEL 177
NOTE:
• The charging system is independent from load reduction.The charging system performs a diagnostic on the
charging system continuously.
• If the Battery Charge Warning Light is on it may indicate a problem with the charging system. Refer to “Battery
Charge Warning Light” in “Getting To Know Your Instru -
ment Panel” for further information.
The electrical loads that may be switched off (if equipped),
and vehicle functions which can be affected by load reduc -
tion:
• Heated Seats / Vented Seats / Heated Wheel
• Rear Defroster And Heated Mirrors
• HVAC System
• 115 Volts AC Power Inverter System
• Audio and Telematics System
Loss of the battery charge may indicate one or more of the
following conditions:
• The charging system cannot deliver enough electrical power to the vehicle system because the electrical loads are
larger than the capability of charging system. The charging
system is still functioning properly. • Turning on all possible vehicle electrical loads (e.g. HVAC
to max settings, exterior and interior lights, overloaded
power outlets +12 Volts, 115V AC, USB ports) during
certain driving conditions (city driving, towing, frequent
stopping).
• Installing options like additional lights, upfitter electrical accessories, audio systems, alarms and similar devices.
• Unusual driving cycles (short trips separated by long parking periods).
• The vehicle was parked for an extended period of time (weeks, months).
• The battery was recently replaced and was not charged completely.
• The battery was discharged by an electrical load left on when the vehicle was parked.
• The battery w as used for an extended period with t he engine not running to supply radio, lights, chargers,
+12 Volt portable appliances like vacuum cleaners,
gam e consoles and similar devices.
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178 GETTING TO KNOW YOUR INSTRUMENT PANEL
What to do when an electrical load reduction action
message is present (“Battery Saver On” or “Battery Saver
Mode”)
During a trip:
• Reduce power to unnecessary loads if possible:• Turn off redundant lights (interior or exterior).

• Check what may be plugged in to power outlets +12 Volts,115V AC, USB ports.

• Check HVAC settings (blower, temperature).
• Check the audio settings (volume).
After a trip:
• Check if any aftermarket equipment was installed (addi -
tional lights, upfitter electrical accessories, audio systems,
alarms) and review specifications if any (load and Ignition
Off Draw currents).
• Evaluate the latest driving cycles (distance, driving time and parking time).
• The vehicle should have service performed if the message is still present during consecutive trips and the evaluation
of the vehicle and driving pattern did not help to identify
the cause.WARNING LIGHTS AND MESSAGES
The warning/indicator lights will illuminate in the instru-
ment panel together with a dedicated message and/or
acoustic signal when applicable. These indications are indic -
ative and precautionary and as such must not be considered
as exhaustive and/or alternative to the information
contained in the Owner’s Manual, which you are advised to
read carefully in all cases. Always refer to the information in
this chapter in the event of a failure indication. All active tell -
tales will display first if applicable. The system check menu
may appear different based upon equipment options and
current vehicle status. Some telltales are optional and may
not appear.
2020_DT_1500_OM_US.book Page 178

SAFETY 263
(Continued)
Your vehicle may also be designed to perform any of these
other functions in response to the Enhanced Accident
Response System:
• Turn off the Fuel Filter Heater, Turn off the HVAC BlowerMotor, Close the HVAC Circulation Door
• Cut off battery power to the: • Engine
• Electric Motor (if equipped)
• Electric power steering
• Brake booster
• Electric park brake
• Automatic transmission gear selector
• Horn
• Front wiper
• Headlamp washer pump
NOTE:
After an accident, remember to cycle the ignition to the STOP
(OFF/LOCK) position and remove the key from the ignition
switch to avoid draining the battery. Carefully check the
vehicle for fuel leaks in the engine compartment and on the
ground near the engine compartment and fuel tank before
resetting the system and starting the engine. If there are no
fuel leaks or damage to the vehicle electrical devices (e.g. headlights) after an accident, reset the system by following
the procedure described below. If you have any doubt,
contact an authorized dealer.
Enhanced Accident Response System Reset Procedure
In order to reset the Enhanced Accident Response System
functions after an event, the ignition switch must be changed
from ignition START or ON/RUN to ignition OFF. Carefully
check the vehicle for fuel leaks in the engine compartment
and on the ground near the engine compartment and fuel
tank before resetting the system and starting the engine.
Maintaining Your Air Bag System
WARNING!
• Modifications to any part of the air bag system could cause it to fail when you need it. You could be injured
if the air bag system is not there to protect you. Do not
modify the components or wiring, including adding
any kind of badges or stickers to the steering wheel hub
trim cover or the upper passenger side of the instru -
ment panel. Do not modify the front bumper, vehicle
body structure, or add aftermarket side steps or
running boards.
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STARTING AND OPERATING 335
• HVAC is set to full defrost mode at a high blower speed
• Engine has not reached normal operating temperature
• Engine temperature too high
• The battery is charging
• The transmission is not in DRIVE
• Hood is open
• Vehicle is in 4L transfer case mode
• TOW/HAUL mode is selected
• Accelerator pedal input
• Excessive 12 volt loads
It may be possible to operate the vehicle several consecutive
times in extreme conditions and not meet all criteria to
enable an Autostop state.
To Start The Engine While In Autostop Mode
While in DRIVE, the engine will start when the brake pedal
is released or the throttle pedal is depressed and the trans-
mission will automatically reengage upon engine restart. Conditions That Will Cause The Engine To Start Automat
-
ically While In Autostop Mode
The engine will start automatically when:
• The transmission selector is moved from DRIVE to REVERSE, NEUTRAL, or PARK
• To maintain cabin temperature near the HVAC settings
• HVAC is set to full defrost mode
• 12 volt demand requires engine restart
• Low brake vacuum (e.g. after several brake pedal applica -
tions)
• STOP/START OFF switch is pushed
• 4WD system is put into 4L mode
• The emissions system override is present
• A STOP/START system error present
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IN CASE OF EMERGENCY 449
Internal Power Distribution Center
The Power Distribution Center is located under the drivers
side instrument panel. This center contains cartridge fuses,
micro fuses, relays, and circuit breakers. A description of
each fuse and component may be stamped on the inside
cover, otherwise the cavity number of each fuse is stamped
on the inside cover that corresponds to the following chart.
CAUTION!
• When installing the power distribution center cover, it is important to ensure the cover is properly positioned
and fully latched. Failure to do so may allow water to
get into the power distribution center and possibly
result in an electrical system failure.
• When replacing a blown fuse, it is important to use only a fuse having the correct amperage rating. The use
of a fuse with a rating other than indicated may result
in a dangerous electrical system overload. If a properly
rated fuse continues to blow, it indicates a problem in
the circuit that must be corrected.
Cavity Cartridge Fuse Micro Fuse Description
F01 30 Amp Pink –Trailer Tow Receptacle
F03 –20 Amp Yellow Module Seat Heater Front (Pass)
F04 ––Spare
F05 –20 Amp Yellow Module PPU Cooling Fan
F06 40 Amp Green –Mod CBC 4 Exterior Light 2
F07 40 Amp Green –Mod CBC 3 PWR Locks
F08 ––Spare
F09 ––Spare
F10 40 Amp Green –HVAC Blower Motor
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452 IN CASE OF EMERGENCY
F43–10 Amp Red Port Diagnostics / Mod CD / Front & Rear USB
F44 –20 Amp Yellow Radio / DCSD / Telematics Box Mod
F45 30 Amp Pink –Mod Door MUX Driver
F46 30 Amp Pink –Mod Door MUX Passenger
F47 ––Spare
F48A -10 Amp Red Rear View Mirror / Humidity Rain And Light
Sensor (HRLS) / SW Window Passenger / Rear
USB / Wireless Charging Pad Mod
F49 –15 Amp Blue Mod CVPM / SNSR Blind Spot / HDLP
Adaptive Front Lighting Sensor (AFLS)
F50A –10 Amp Red Battery PACK Control Mod
F51 A&B ––Spare
F52 20 Amp Blue –Direct Battery Feed
F53 –15 Amp Blue Mod ICS Switch / Mod HVAC CTRL / Sw Bank
Upper / Sw EPB / Mod Control Steering
F54B –20 Amp Yellow Power Outlet Center Seat
F55 25 Amp White –Upfitter
F56 30 Amp Pink –Mod Network Interface
F57 20 Amp Blue –Direct Battery Feed
F58 20 Amp Blue –Direct Battery Feed
Cavity
Cartridge Fuse Micro Fuse Description
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IN CASE OF EMERGENCY 453
(Continued)
F6050 Amp Red –Mod Inverter
F61 ––Spare
F62 A&B –10 Amp Red ITBM / Mod Occupant Class / Mod IAIR
Suspension / Mod HVAC Snsr Incar Temp /
Rear Coolant Temp / PTS / Mod IRCM
F63 ––Spare
F64 ––Spare
F65 –10 Amp Red Mod ORC
F66 –10 Amp Red Run - Accessory Feed
Cavity
Cartridge Fuse Micro Fuse Description
CAUTION!
• When installing the power distribution center cover, it is important to ensure the cover is properly positioned
and fully latched. Failure to do so may allow water to
get into the power distribution center and possibly
result in an electrical system failure.
• When replacing a blown fuse, it is important to useonly a fuse having the correct amperage rating. The use
of a fuse with a rating other than indicated may result
in a dangerous electrical system overload. If a properly
rated fuse continues to blow, it indicates a problem in
the circuit that must be corrected. CAUTION!
(Continued)
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