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STARTING AND OPERATING
213
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 (ATH) – Lowers the
vehicle approximately 1 in (25 mm) for a level
truck, to be used as required while trailer
towing. It will automatically adjust to maintain
the rear ride height as conditions change.
Trailer Decoupling/Unloading - The air
suspension system will load level (lower/
exhaust only) once after 12 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
12 minutes you will need to turn the ignition to
the run position for the air suspension to
re-level due to addition/removal of load in the
vehicle. If the air suspension system is disabled
using the settings menu (Tire Jack Mode,
Transport Mode, Alignment Mode, or Bed
Lowering Mode) the system will remain disabled
when the vehicle is turned off. Reactivating the
air suspension can be accomplished via the
settings menu or driving the vehicle above
5 mph (8 km/h) for Tire Jack Mode or Alignment
Mode and 16 mph (26 km/h) for Transport
Mode and Bed Lowering Mode.
NOTE:
Most 3500 models will not lower to Alternate
Trailer Height (ATH) when unloaded.
Refer to “Trailer Towing” in “Starting And
Operating” 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.
Air Suspension Modes
The air suspension system has multiple modes
to protect the system in unique situations:
Tire/Jack Mode
To assist with changing a tire, the air
suspension system has a feature which allows
the automatic leveling to be disabled. This
mode is intended to be enabled with engine
running. Refer to “Instrument Cluster Display”
in “Getting To Know Your Instrument Panel” or
“Uconnect Settings” in “Multimedia” if
equipped with a touch screen radio for further
information.
NOTE:
This mode is intended to be enabled with
engine running.
Transport Mode
For towing your vehicle with four wheels off the
road, the air suspension system has a feature
which will put the vehicle below Normal Ride
Height (NRH) and disable the automatic load
leveling system. This mode is intended to be
enabled with engine running. Refer to
“Instrument Cluster Display” in “Getting To
Know Your Instrument Panel” or “Uconnect
Settings” in “Understanding Your Instrument
Panel” if equipped with a touch screen radio for
further information.
WARNING!
The air suspension system uses a high
pressure volume of air to operate the system.
To avoid personal injury or damage to the
system, see your authorized dealer for
service.
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