2023 JEEP GRAND CHEROKEE ECU

SAFETY249
If the ABS Warning Light is on, the brake system
should be serviced as soon as possible to restore
the benefits of Anti-Lock Brakes. If the ABS
Warning Light does not come on when the ignition
is placed in the ON/RUN mode, have the light
repaired as soon as possible.
DROWSY DRIVER DETECTION (DDD) —
I
F EQUIPPED
DDD detects when the driver is feeling fatigued
and warns the driver to pull over and take a break.
To Activate/Deactivate

DDD can be activated and deactivated through the
Uconnect system by selecting the following in order:

1. “Safety & Driving Assistance”

2. “Drowsy Driver Detection”
System Operation
Using feedback obtained from the driver’s steering
patterns, any buttons/switches that are pressed,
and from the front camera, the system implements
two operating logics:
The first operating logic takes the driving style
into account, observing the road and detecting
to what extent the driver can continue driving
with few lane crossing events.
The second operating logic measures the time
spent behind the wheel with the vehicle speed
above 40 mph (60 km/h) and below 100 mph
(160 km/h).
If the driving style indicates that the driver is
unable to follow the road trajectory and respect the
horizontal lane markings while within the operating
speed range of the system, a pop up will display on
the instrument cluster display to suggest that the
driver should stop for a break. An audible signal
will also sound.
If the driver accepts the suggestion provided by the
system by pushing the “OK” button on the left side
of the steering wheel, the message will disappear
from the display.
If the driver does not acknowledge the warning, it
will be displayed for 60 seconds and then
disappear.
NOTE:In the event of a DDD system failure, a dedicated
message will appear in the instrument cluster
display.

DDD Warning Message

REAR SEAT REMINDER ALERT (RSRA)
RSRA alerts you through a visual and auditory
notification of the possible presence of an object,
passenger, or pet in the rear seats if a rear door
was opened up to 10 minutes before the ignition
was placed in the ON/RUN position. RSRA does not
directly detect objects, passengers, or pets in the
rear seats. When the previous conditions are met,
RSRA displays the message “Check Rear Seat” on
the instrument cluster display and sounds an
auditory alert upon the driver placing the ignition in
the OFF position to exit the vehicle.
To enable or disable RSRA, see Ú page 204.WARNING!
The DDD system is an aid for driving and does
not relieve the driver of the responsibility of
driving the vehicle. Always drive alert and get
plenty of rest before driving. If you experience
fatigue while driving, do not wait for the DDD to
intervene with a warning. Choose a safe and
secure location where you can pull over safely
for a break. Only return to the road when you are
in the right physical and mental condition to
prevent endangering yourself and others.
6

23_WL_OM_EN_USC_t.book Page 249

SAFETY269
In the Selectable Tire Fill Alert application, which is
located in the apps menu of the Uconnect system,
you will be able to select a pressure setting for both
the front and rear axle tire pressures by scrolling
through a pressure range from ≥15 psi to XX in
1 psi increments for each axle setting.
XX = the vehicle's cold placard pressure values for
the front and rear axles as shown on the vehicle
placard pressure label.
You may also store pressure values chosen for
each axle in the Uconnect system application as
preset pressure values. Up to two sets of preset
pressure values can be stored in the Uconnect
system for the front and rear axle. Once you select
the tire pressures for the front and rear axles that
you want to inflate or deflate to, you can begin
inflating or deflating one tire at a time.
NOTE:The STFA system will only support inflating or
deflating one tire at a time. The user is required to
wait until the hazard lights STOP flashing or 26-30
seconds after the desired pressure is achieved in
one wheel before switching to another.
The system will be activated when the TPMS
receiver module detects a change in tire pressure.
The ignition must be in the ON/RUN mode, with the
transmission in PARK in vehicles with an automatic
transmission, and in NEUTRAL with the parking
brake engaged in vehicles with a manual transmission. The hazard lamps will come on to
confirm the vehicle is in Tire Fill Alert mode.
When Tire Fill Alert mode is entered, the tire
pressure screen will be displayed in the instrument
cluster. If the hazard lamps do not come on while
inflating or deflating the tire, the Tire Pressure
Monitoring System sensor may be in an
inoperative position, preventing the TPMS sensor
signal from being received. In this case, the vehicle
may need to be moved slightly forward or
backward.
Horn chirps will indicate STFA status as tires are
inflated/deflated. The horn will chirp under the
following STFA states:

1. The horn will chirp once when the selected
pressure is reached to let you know when to
stop inflating or deflating the tire.

2. The horn will chirp three times if the tire is overinflated or over-deflated.
3. The horn will chirp once again when enough air is added or removed to reach proper selected
pressure level.
OCCUPANT RESTRAINT SYSTEMS
Some of the most important safety features in your
vehicle are the restraint systems:
OCCUPANT RESTRAINT SYSTEMS
F
EATURES
Seat Belt Systems
Supplemental Restraint Systems (SRS) Air Bags
Child Restraints
Some of the safety features described in this
section may be standard equipment on some
models, or may be optional equipment on others. If
you are not sure, ask an authorized dealer.
IMPORTANT SAFETY PRECAUTIONS
Please pay close attention to the information in
this section. It tells you how to use your restraint
system properly, to keep you and your passengers
as safe as possible.
Here are some simple steps you can take to
minimize the risk of harm from a deploying air bag:

1. Children 12 years old and under should always ride buckled up in the rear seat of a
vehicle with a rear seat.

2. A child who is not big enough to wear the vehicle seat belt properly must be secured in
the appropriate child restraint or
belt-positioning booster seat in a rear seating
position Ú page 289.
6

23_WL_OM_EN_USC_t.book Page 269

SAFETY271
(Continued)
(Continued)
outboard front passenger seat is unoccupied). The
BeltAlert warning sequence starts by blinking the
Seat Belt Reminder Light and sounding an
intermittent chime. Once the BeltAlert warning
sequence has completed, the Seat Belt Reminder
Light will remain on until the seat belts are
buckled. The BeltAlert warning sequence may
repeat based on vehicle speed until the driver and
occupied outboard front seat passenger seat belts
are buckled. The driver should instruct all
occupants to buckle their seat belts.
Change Of Status
If the driver or outboard front seat passenger (if
equipped with outboard front passenger seat
BeltAlert) unbuckles their seat belt while the
vehicle is traveling, the BeltAlert warning sequence
will begin until the seat belts are buckled again.
The outboard front passenger seat BeltAlert is not
active when the outboard front passenger seat is
unoccupied. BeltAlert may be triggered when an
animal or other items are placed on the outboard
front passenger seat or when the seat is folded flat
(if equipped). It is recommended that pets be
restrained in the rear seat (if equipped) in pet
harnesses or pet carriers that are secured by seat
belts, and cargo is properly stowed.
BeltAlert can be activated or deactivated by an
authorized dealer. FCA US LLC does not
recommend deactivating BeltAlert.
NOTE:If BeltAlert has been deactivated and the driver or
outboard front seat passenger (if equipped with
outboard front passenger seat BeltAlert) is
unbuckled the Seat Belt Reminder Light will turn
on and remain on until the driver and outboard
front seat passenger seat belts are buckled.
Lap/Shoulder Belts
All seating positions in your vehicle are equipped
with lap/shoulder belts.
The seat belt webbing retractor will lock only during
very sudden stops or collisions. This feature allows
the shoulder part of the seat belt to move freely
with you under normal conditions. However, in a
collision the seat belt will lock and reduce your risk
of striking the inside of the vehicle or being thrown
out of the vehicle.
WARNING!
Relying on the air bags alone could lead to
more severe injuries in a collision. The air
bags work with your seat belt to restrain you
properly. In some collisions, the air bags won’t
deploy at all. Always wear your seat belt even
though you have air bags.
In a collision, you and your passengers can
suffer much greater injuries if you are not
properly buckled up. You can strike the inte
-
rior of your vehicle or other passengers, or you
can be thrown out of the vehicle. Always be
sure you and others in your vehicle are
buckled up properly.
It is dangerous to ride in a cargo area, inside
or outside of a vehicle. In a collision, people
riding in these areas are more likely to be seri -
ously injured or killed.
Do not allow people to ride in any area of your
vehicle that is not equipped with seats and
seat belts.
Be sure everyone in your vehicle is in a seat
and using a seat belt properly. Occupants,
including the driver, should always wear their
seat belts whether or not an air bag is also
provided at their seating position to minimize
the risk of severe injury or death in the event
of a crash.
WARNING!
6

23_WL_OM_EN_USC_t.book Page 271

SAFETY275
Seat Belts And Pregnant Women

Seat Belts And Pregnant Women

Seat belts must be worn by all occupants including
pregnant women: the risk of injury in the event of
an accident is reduced for the mother and the
unborn child if they are wearing a seat belt.
Position the lap belt snug and low below the
abdomen and across the strong bones of the hips.
Place the shoulder belt across the chest and away
from the neck. Never place the shoulder belt
behind the back or under the arm.
Seat Belt Pretensioner
The front outboard seat belt system is equipped
with pretensioning devices that are designed to
remove slack from the seat belt in the event of a
collision. These devices may improve the
performance of the seat belt by removing slack from the seat belt early in a collision. Pretensioners
work for all size occupants, including those in child
restraints.
NOTE:These devices are not a substitute for proper seat
belt placement by the occupant. The seat belt still
must be worn snugly and positioned properly.
The pretensioners are triggered by the Occupant
Restraint Controller (ORC). Like the air bags, the
pretensioners are single use items. A deployed
pretensioner or a deployed air bag must be
replaced immediately.
Energy Management Feature
The front outboard seat belt system is equipped
with an Energy Management feature that may help
further reduce the risk of injury in the event of a
collision. The seat belt system has a retractor
assembly that is designed to release webbing in a
controlled manner.
Switchable Automatic Locking Retractor
(ALR)
The seat belts in the passenger seating positions
are equipped with a Switchable Automatic Locking
Retractor (ALR) which is used to secure a child
restraint system Ú
page 298.
The figure provided illustrates the locking feature
for each seating position.
5 Passenger Automatic Locking Retractor (ALR) Locations



Captain’s Chairs Second Row (6 Passenger) Automatic Locking Retractor (ALR) Locations

6

23_WL_OM_EN_USC_t.book Page 275

SAFETY289
NOTE:EDR data are recorded by your vehicle only if a
non-trivial crash situation occurs; no data are
recorded by the EDR under normal driving condi -
tions and no personal data (e.g., name, gender,
age, and crash location) are recorded. However,
other parties, such as law enforcement, could
combine the EDR data with the type of personally
identifying data routinely acquired during a crash
investigation.
To read data recorded by an EDR, special
equipment is required, and access to the vehicle or
the EDR is needed. In addition to the vehicle
manufacturer, other parties, such as law
enforcement, that have the special equipment,
can read the information if they have access to the
vehicle or the EDR.
CHILD RESTRAINTS
Everyone in your vehicle needs to be buckled up at
all times, including babies and children. Every
state in the United States, and every Canadian
province, requires that small children ride in
proper restraint systems. This is the law, and you
can be prosecuted for ignoring it. Children 12 years or younger should ride properly
buckled up in a rear seat, if available. According to
crash statistics, children are safer when properly
restrained in the rear seats rather than in the front.
There are different sizes and types of restraints for
children from newborn size to the child almost
large enough for an adult safety belt. Always check
the child seat Owner’s Manual to make sure you
have the correct seat for your child. Carefully read
and follow all the instructions and warnings in the
child restraint Owner’s Manual and on all the
labels attached to the child restraint.
Before buying any restraint system, make sure that
it has a label certifying that it meets all applicable
Safety Standards. You should also make sure that
you can install it in the vehicle where you will use it.
NOTE:
For additional information, refer to http://
www.nhtsa.gov/parents-and-caregivers or
call: 1–888–327–4236
Canadian residents should refer to Transport
Canada’s website for additional information:
http://www.tc.gc.ca/en/services/road/
child-car-seat-safety.html
WARNING!
In a collision, an unrestrained child can become
a projectile inside the vehicle. The force required
to hold even an infant on your lap could become
so great that you could not hold the child, no
matter how strong you are. The child and others
could be badly injured or killed. Any child riding
in your vehicle should be in a proper restraint for
the child’s size.
6

23_WL_OM_EN_USC_t.book Page 289

SAFETY291
(Continued)
Older Children And Child Restraints
Children who are two years old or who have
outgrown their rear-facing convertible child seat
can ride forward-facing in the vehicle.
Forward-facing child seats and convertible child
seats used in the forward-facing direction are for
children who are over two years old or who have
outgrown the rear-facing weight or height limit of
their rear-facing convertible child seat. Children
should remain in a forward-facing child seat with a
harness for as long as possible, up to the highest
weight or height allowed by the child seat.
All children whose weight or height is above the
forward-facing limit for the child seat should use a
belt-positioning booster seat until the vehicle’s
seat belts fit properly. If the child cannot sit with
knees bent over the vehicle’s seat cushion while
the child’s back is against the seatback, they
should use a belt-positioning booster seat. The
child and belt-positioning booster seat are held in
the vehicle by the seat belt.
Children Too Large For Booster Seats
Children who are large enough to wear the
shoulder belt comfortably, and whose legs are long
enough to bend over the front of the seat when
their back is against the seatback, should use the
seat belt in a rear seat. Use this simple 5-step test
to decide whether the child can use the vehicle’s
seat belt alone:

1. Can the child sit all the way back against the back of the vehicle seat?
2. Do the child’s knees bend comfortably over
the front of the vehicle seat while the child is
still sitting all the way back?
3. Does the shoulder belt cross the child’s shoulder between the neck and arm?
4. Is the lap part of the belt as low as possible, touching the child’s thighs and not the
stomach?
5. Can the child stay seated like this for the whole trip?
If the answer to any of these questions was “no,”
then the child still needs to use a booster seat in
this vehicle. If the child is using the lap/shoulder
belt, check seat belt fit periodically and make sure
the seat belt buckle is latched. A child’s squirming
or slouching can move the belt out of position. If
the shoulder belt contacts the face or neck, move
the child closer to the center of the vehicle, or use
a booster seat to position the seat belt on the child
correctly.
WARNING!
Improper installation can lead to failure of an
infant or child restraint. It could come loose in
a collision. The child could be badly injured or
killed. Follow the child restraint manufac -
turer’s directions exactly when installing an
infant or child restraint.
After a child restraint is installed in the
vehicle, do not move the vehicle seat forward
or rearward because it can loosen the child
restraint attachments. Remove the child
restraint before adjusting the vehicle seat
position. When the vehicle seat has been
adjusted, reinstall the child restraint.
When your child restraint is not in use, secure
it in the vehicle with the seat belt or LATCH
anchorages, or remove it from the vehicle. Do
not leave it loose in the vehicle. In a sudden
stop or accident, it could strike the occupants
or seatbacks and cause serious personal
injury.
WARNING!
WARNING!
Never allow a child to put the shoulder belt
under an arm or behind their back. In a crash,
the shoulder belt will not protect a child properly,
which may result in serious injury or death. A
child must always wear both the lap and
shoulder portions of the seat belt correctly.
6

23_WL_OM_EN_USC_t.book Page 291

SAFETY297
Six Passenger Second Row Seating:
Seven Passenger Second Row Seating:
If a child restraint installed in the center position
blocks the seat belt webbing or buckle for the
outboard position, do not use that outboard
position. If a child seat in the center position blocks
the outboard LATCH anchors or seat belt, do not
install a child seat in that outboard position.
Always follow the directions of the child restraint
manufacturer when installing your child restraint.
Not all child restraint systems will be installed as
described here.
To Install A LATCH-Compatible Child
Restraint
If the selected seating position has a Switchable
Automatic Locking Retractor (ALR) seat belt, stow
the seat belt, following the instructions below. See
Ú page 298 to check what type of seat belt each
seating position has.

1. Loosen the adjusters on the lower straps and on the tether strap of the child seat so that
you can more easily attach the hooks or
connectors to the vehicle anchorages.

2. Place the child seat between the lower anchorages for that seating position. If the
second row seat can be reclined, you may
recline the seat and/or raise the head restraint
(if adjustable) to get a better fit. If the rear seat
can be moved forward and rearward in the
vehicle, you may wish to move it to its
rear-most position to make room for the child
seat. You may also move the front seat forward
to allow more room for the child seat.
3. Attach the lower hooks or connectors of the child restraint to the lower anchorages in the
selected seating position.
4. If the child restraint has a tether strap, connect it to the top tether anchorage. See
Úpage 300 for directions to attach a tether
anchor. 5. Tighten all of the straps as you push the child
restraint rearward and downward into the
seat. Remove slack in the straps according to
the child restraint manufacturer’s instructions.
6. Test that the child restraint is installed tightly by pulling back and forth on the child seat at
the belt path. It should not move more than
1 inch (25.4 mm) in any direction.
How To Stow An Unused Switchable-ALR
(ALR) Seat Belt:
When using the LATCH attaching system to install
a child restraint, stow all ALR seat belts that are not
being used by other occupants or being used to
secure child restraints. An unused belt could injure
a child if they play with it and accidentally lock the
seat belt retractor. Before installing a child
restraint using the LATCH system, buckle the seat
belt behind the child restraint and out of the child’s
reach. If the buckled seat belt interferes with the
child restraint installation, instead of buckling it
behind the child restraint, route the seat belt
through the child restraint belt path and then
buckle it. Do not lock the seat belt. Remind all
children in the vehicle that the seat belts are not
toys and that they should not play with them.
WARNING!
This vehicle does not have a center seating
position. Do not use the center lower LATCH
anchorages to install a child seat in the center of
the back seat.
WARNING!
Never use the same lower anchorage to attach
more than one child restraint. For typical
installation instructions, see Ú page 297.
6

23_WL_OM_EN_USC_t.book Page 297

298SAFETY
Installing Child Restraints Using The
Vehicle Seat Belt
Child restraint systems are designed to be secured
in vehicle seats by lap belts or the lap belt portion
of a lap/shoulder belt. The seat belts in the passenger seating positions
are equipped with a Switchable Automatic Locking
Retractor (ALR) that is designed to keep the lap
portion of the seat belt tight around the child
restraint so that it is not necessary to use a locking
clip. The ALR retractor can be “switched” into a
locked mode by pulling all of the webbing out of the
retractor and then letting the webbing retract back
into the retractor. If it is locked, the ALR will make
a clicking noise while the webbing is pulled back
into the retractor.
Refer to the “Automatic Locking Mode” description
on Ú
page 275 for additional information on ALR.
Please see the table below and the following
sections for more information.
WARNING!
Improper installation of a child restraint to the
LATCH anchorages can lead to failure of the
restraint. The child could be badly injured or
killed. Follow the child restraint manufac -
turer’s directions exactly when installing an
infant or child restraint.
Child restraint anchorages are designed to
withstand only those loads imposed by
correctly-fitted child restraints. Under no
circumstances are they to be used for adult
seat belts, harnesses, or for attaching other
items or equipment to the vehicle.
WARNING!

Improper installation or failure to properly secure
a child restraint can lead to failure of the restraint.
The child could be badly injured or killed.

Follow the child restraint manufacturer’s
directions exactly when installing an infant or
child restraint.

23_WL_OM_EN_USC_t.book Page 298