trailer Ram 3500 2018 Quick Reference Guide

2500/3500 AIR SUSPENSION SYSTEM
This air suspension system is a rear leveling ride
height system. The main purpose of this system
is to maintain the truck’s rear ride height level.
There are two selectable heights that can be
chosen based on your operating conditions.
The system requires that the ignition be in ON/
RUN position or the engine running with zero
vehicle speed for all user requested changes and
load leveling.
Normal Ride Height (NRH)– This is the standard
position of the suspension and is meant for
normal driving. It will automatically adjust
to maintain the rear ride height as conditions
change.
Alternate Trailer Height (A TH)– Lowers the ve-
hicle approximately 1 in (25 mm) for a level
truck, to be used as required while trailer tow-
ing. It will automatically adjust to maintain the
rear ride height as conditions change.
NOTE:
• Most 3500 models will not lower to Alter- nate Trailer Height (ATH) when unloaded.
• Refer to “Trailer Towing” in “Starting And Operating” in your Owner’s Manual at
www.mopar.com/en-us/care/owners-manual.html
(U.S. Residents) or www.owners.mopar.ca
(Canadian Residents) for further information.
Ignition OFF Behavior
For a predetermined amount of time after the
ignition is off the air suspension may adjust to
maintain a proper appearance. Trailer Decoupling/Unloading
The air suspension system will maintain load
level (lower/exhaust only) for up to 10 minutes
after the vehicle is turned off. This allows for
easy removal of a trailer and/or load from the
back of the truck by maintaining the ride
height. After 10 minutes, you will need to turn
the ignition to the RUN position for the air
suspension to maintain the ride height.
If the air suspension system is disabled using
the settings menu (Tire Jack Mode, Transport
Mode or Alignment Mode), the system will
remain disabled when the vehicle is turned off.
Reactivating the air suspension can be accom-
plished via the settings menu or by driving the
vehicle above 5 mph (8 km/h) for Tire Jack
Mode or Alignment Mode or 16 mph (26 km/h)
for Transport Mode.
Alternate Trailer Height Button
RAM 2500/3500

• There is an electric heater inside the DEFtank that automatically works when neces-
sary. And if the DEF supply does freeze, the
truck will operate normally until it thaws.
• Ensure the DEF cap is reinstalled prior to filling vehicle with diesel fuel to avoid spill-
ing diesel fuel into the DEF Filler.
AUXILIARY SWITCHES
There can be up to five auxiliary switches located
in the lower switch bank of the instrument panel,
which can all be used to power various electronic
devices and PTO (Power Take Off) – if equipped.
Connections to the switches are found under the
hood in the connectors attached to the auxiliary
Power Distribution Center.
The system has the ability to configure the
functionality of the auxiliary switches via the
Instrument Cluster Display. All switches can
now be configured for ignition or battery power,
saving or not saving the state across a key cycle,
and momentary or latching switch operation. For further information on using the auxiliary
switches, please refer to the Ram Body Builders
Guide by accessing
www.rambodybuilder.com
and choosing the appropriate links.
For general questions on upfitting commercial
vehicles, including:
• Loose rear park assist installation
• Programmable auxiliary switches
• PTO (Power Take Off) system
• Wiring diagrams
• Vehicle dimensions
• Snow plow installation
• Weight charts and trailer towing
Please consult the Body Builders Guide at
www.rambodybuilder.com.For further information, and applicable warnings
and cautions, please refer to the Owner’s Manual at
www.mopar.com/en-us/care/owners-manual.html
(U.S. Residents) or www.owners.mopar.ca (Cana-
dian Residents).
USB Port
Uconnect Media Hub
1 — USB Port
2 — AUX Jack
3 — USB Port
FRONT USB PORT/AUDIO
JACK (AUX) PORT