
318 STARTING AND OPERATING
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 main -
taining 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 Instru
-
ment 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.
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.

STARTING AND OPERATING 319
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.
NOTE:
This mode is intended to be enabled with engine running.
Wheel Alignment Mode
Before performing a wheel alignment this mode must be
enabled. 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.Bed Lowering 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.
Protection Strategy
In order to “protect” the air suspension system, the vehicle
will disable load leveling as required (suspension over
-
loaded, battery charge low, etc.). Load leveling will automat -
ically resume as soon as system operation requirements are
met. See your authorized dealer if system does not resume.
5

STARTING AND OPERATING 375
Stationary Objects And Vehicles
ACC does not react to stationary objects and stationary vehi-
cles. For example, ACC will not react in situations where the
vehicle you are following exits your lane and the vehicle
ahead is stopped in your lane. Always be attentive and ready
to apply the brakes if necessary.
Stationary Object And Stationary Vehicle ExampleGeneral Information
The following regulatory statement applies to all Radio
Frequency (RF) devices equipped in this vehicle:
This device complies with Part 15 of the FCC Rules and with
Industry Canada license-exempt RSS standard(s). Operation
is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received,including interference that may cause undesired opera -
tion.
NOTE:
Changes or modifications not expressly approved by the
party responsible for compliance could void the user’s
authority to operate the equipment.
5

384 STARTING AND OPERATING
The vehicle is close to the obstacle when the warning display shows one flashing arc and sounds a continuous tone. The
following chart shows the warning alert operation when the system is detecting an obstacle:
NOTE:
ParkSense will reduce the volume of the radio, if on, when
the system is sounding an audio tone.Adjustable Chime Volume Settings
The rear chime volume settings are programmable through
the Uconnect system. Refer to “Uconnect Settings” in “Multi
-
media” for further information.
The chime volume settings include low, medium, and high.
The factory default volume is medium.
WARNING ALERTS
Rear Distance (inches/cm) Greater than
79 inches (200 cm) 79-59 inches
(200-150 cm) 59-47 inches
(150-120 cm) 47-39 inches
(120-100 cm) 39-25 inches
(100-65 cm) 25-12 inches
(65-30 cm) Less than
12 inches (30 cm)
Audible Alert Chime NoneSingle 1/2
Second Tone Slow Slow Fast
Fast Continuous
Arcs-Left None None None None None 2nd Flashing 1st Flashing
Arcs-Center None 6th Solid 5th Solid 4th Solid 3rd Flashing 2nd Flashing 1st Flashing Arcs-Right None None None None None 2nd Flashing 1st Flashing Radio
Volume
Reduced No
Yes YesYesYesYesYes

386 STARTING AND OPERATING
(Continued)
Cleaning The ParkSense System
Clean the ParkSense sensors with water, car wash soap and
a soft cloth. Do not use rough or hard cloths. Do not scratch
or poke the sensors. Otherwise, you could damage the
sensors.
ParkSense System Usage Precautions
NOTE:
• Ensure that the rear bumper is free of snow, ice, mud, dirtand debris to keep the ParkSense system operating prop -
erly.
• Jackhammers, large trucks, and other vibrations could affect the performance of ParkSense.
• When you move the gear selector into REVERSE with ParkSense turned off, the instrument cluster display will
show "Off" on the vehicle graphic arcs for as long as the
vehicle is in REVERSE.
• ParkSense, when on, will reduce the volume of the radio when it is sounding a tone.
• Clean the ParkSense sensors regularly, taking care not to scratch or damage them. The sensors must not be covered
with ice, snow, slush, mud, dirt or debris. Failure to do so
can result in the system not working properly. The Park -Sense system might not detect an obstacle behind the
fascia/bumper, or it could provide a false indication that
an obstacle is behind the fascia/bumper.
• Ensure the ParkSense system is OFF if objects such as bicycle carriers, trailer hitches, etc., are placed within
18 inches (45 cm) of the rear fascia/bumper while driving
the vehicle. Failure to do so can result in the system misin -
terpreting a close obstacle as a sensor problem, causing the
"Rear ParkSense Unavailable Service Required" message
to appear in the instrument cluster display.
• On vehicles equipped with a tailgate, ParkSense should be disabled when the tailgate is in the lowered or open posi -
tion and the vehicle is in REVERSE. A lowered tailgate
could provide a false indication that an obstacle is behind
the vehicle.
WARNING!
• Drivers must be careful when backing up even when using ParkSense. Always check carefully behind your
vehicle, look behind you, and be sure to check for
pedestrians, animals, other vehicles, obstructions, and
blind spots before backing up. You are responsible for
safety and must continue to pay attention to your
surroundings. Failure to do so can result in serious
injury or death.

392 STARTING AND OPERATING
The vehicle is close to the obstacle when the display shows one flashing arc and sounds a continuous tone. The following chart
shows the warning alert operation when the system is detecting an obstacle:WARNING ALERTS FOR REAR
Rear Distance (inches/cm) Greater than
79 inches (200 cm) 79-59 inches
(200-150 cm) 59-47 inches
(150-120 cm) 47-39 inches
(120-100 cm) 39-25 inches
(100-65 cm) 25-12 inches
(65-30 cm) Less than
12 inches (30 cm)
Audible Alert Chime NoneSingle 1/2
Second Tone Slow Slow Fast
Fast Continuous
Arcs-Left None None None None None 2nd Flashing 1st Flashing
Arcs-Center None 6th Solid 5th Solid 4th Solid 3rd Flashing 2nd Flashing 1st Flashing Arcs-Right None None None None None 2nd Flashing 1st Flashing Radio
Volume
Reduced No
Yes YesYesYesYesYes

STARTING AND OPERATING 393
NOTE:
ParkSense will reduce the volume of the radio, if on, when
the system is sounding an audio tone.
Front Park Assist Audible Alerts
ParkSense will turn off the Front Park Assist audible alert
(chime) after approximately three seconds when an obstacle
has been detected, the vehicle is stationary, and brake pedal
is applied.Adjustable Chime Volume Settings
The Front and Rear chime volume settings are program
-
mable through the Uconnect system. Refer to “Uconnect
Settings” in “Multimedia” for further information.
The chime volume settings include low, medium, and high.
The factory default volume is medium.
WARNING ALERTS FOR FRONT
Front Distance (inches/cm) Greater than
47 inches (120 cm) 47-39 inches
(120-100 cm) 39-25 inches
(100-65 cm) 25-12 inches
(65-30 cm) Less than 12 inches
(30 cm)
Audible Alert Chime None
NoneNone FastContinuous
Arcs-Left NoneNoneNone2nd Flashing 1st Flashing
Arcs-Center None4th Solid 3rd Flashing 2nd Flashing 1st Flashing
Arcs-Right NoneNoneNone2nd Flashing 1st Flashing
Radio Volume Reduced No
NoNoYes Yes
5

STARTING AND OPERATING 395
Cleaning The ParkSense System
Clean the ParkSense sensors with water, car wash soap and
a soft cloth. Do not use rough or hard cloths. Do not scratch
or poke the sensors. Otherwise, you could damage the
sensors.
ParkSense System Usage Precautions
NOTE:
• Ensure that the front and rear bumpers are free of snow,ice, mud, dirt and debris to keep the ParkSense system
operating properly.
• Jackhammers, large trucks, and other vibrations could affect the performance of ParkSense.
• When you move the gear selector to the REVERSE position and Front or Rear ParkSense is turned off, the instrument
cluster display will show "Off" on the vehicle graphic arcs.
This vehicle graphic will be displayed for as long as the
vehicle is in REVERSE.
• ParkSense, when on, will reduce the volume of the radio when it is sounding a tone. • Clean the ParkSense sensors regularly, taking care not to
scratch or damage them. The sensors must not be covered
with ice, snow, slush, mud, dirt or debris. Failure to do so
can result in the system not working properly. The Park -
Sense system might not detect an obstacle behind or in
front of the fascia/bumper, or it could provide a false indi -
cation that an obstacle is behind or in front of the fascia/
bumper.
• Use the ParkSense switch to turn the ParkSense system off if obstacles such as bicycle carriers, trailer hitches, etc. are
placed within 18 inches (45 cm) from the rear fascia/
bumper. Failure to do so can result in the system misinter -
preting a close obstacle as a sensor problem, causing the
“Front/Rear ParkSense Unavailable Service Required”
message to be appear in the instrument cluster display.
• On vehicles equipped with a tailgate, ParkSense should be disabled when the tailgate is in the lowered or open posi -
tion. A lowered tailgate could provide a false indication
that an obstacle is behind the vehicle.
5