STARTING AND OPERATING
155
Transfer Case Position Indicator Light
The Transfer Case Position Indicator Light in the
instrument cluster is used to alert the driver that the front
axle is fully engaged and all four wheels are driving.
AIR SUSPENSION SYSTEM — IF EQUIPPED
D
ESCRIPTION
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 the ON/RUN
position or the engine running.
Rear Leveling Ride Height Switch
Standard Ride Height (SRH) – 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 inch (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.
NOTE:
If lightly loaded, 3500 models will lower as close to
1 inch (25 mm) as possible.
Trailer Decoupling/Unloading – The air suspension
system will continue to load level after the vehicle has
been turned off for 5 minutes without compressor
activation. This allows for easy removal of a trailer and/or
load from the back of the truck by maintaining the ride
height. After 5 minutes you will need to turn the ignition to
the ON/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,
Alignment Mode, Transport Mode and Bed Lowering
Mode.
NOTE:
Most 3500 models will not lower to Alternate Trailer
Height (ATH) when unloaded.
A
IR
S
USPENSION
M
ODES
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
page 104 or
NOTE:
This mode is intended to be enabled with the engine
running.
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 an authorized
dealer for service.
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