2023 JEEP COMPASS ECU

72GETTING TO KNOW YOUR VEHICLE
(Continued)
ROOF LUGGAGE RACK — IF EQUIPPED
The load carried on the roof, when equipped with a
luggage rack, must not exceed 150 lb (68 kg), and
it should be uniformly distributed over the cargo
area.
Crossbars should always be used whenever cargo
is placed on the roof rack. Check the straps
frequently to be sure that the load remains
securely attached.
NOTE:Crossbars can be purchased at your authorized
dealer through Mopar® parts.
External racks do not increase the total load
carrying capacity of the vehicle. Be sure that the
total occupant and luggage load inside the vehicle,
plus the load on the luggage rack, do not exceed
the maximum vehicle load capacity.
WARNING!
Cargo must be securely tied down before driving
your vehicle. Improperly secured loads can fly off
the vehicle, particularly at high speeds, resulting
in personal injury or property damage. Follow
the roof rack cautions when carrying cargo on
your roof rack.
CAUTION!
To avoid damage to the roof rack and vehicle,
do not exceed the maximum roof rack load
capacity. Always distribute heavy loads as
evenly as possible and secure the load appro-
priately.
Long loads, which extend over the windshield,
should be secured to both the front and rear of
the vehicle.
Place a blanket or other protection between
the surface of the roof and the load.
Travel at reduced speeds and turn corners
carefully when carrying large or heavy loads
on the roof rack. Wind forces, due to natural
causes or nearby truck traffic, can add sudden
upward lift. It is recommended to not carry
large flat loads, such as wood panels or surf -
boards, which may result in damage to the
cargo or your vehicle.
Load should always be secured to crossbars
first, with tie down loops used as additional
securing points if needed. Tie loops are
intended as supplementary tie down points
only. Do not use ratcheting mechanisms with
the tie loops. Check the straps frequently to be
sure that the load remains securely attached.
CAUTION!

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86GETTING TO KNOW YOUR INSTRUMENT PANEL
VEHICLE SETTINGS — IF EQUIPPED
Push and release the up or down arrow
button until the Vehicle Setup Menu item is
displayed in the instrument cluster display. This
menu item allows you to change the settings for
the following:
Display
Navigation Repetition
Security
Passenger Airbag
Seat Belt Reminder
Safety and Assistance
Speed Warning
Hill Start Assist
NOTE:Most vehicle settings will be moved into the radio
if a touchscreen radio is present Ú page 165.
Display
By selecting Display, the following settings can be
selected:
Language: select the language in which to
display the information/warnings.
Phone Repetition: displays information relating
to the phone mode. Units
By selecting Units, the unit of measurement to use
for displaying various values can be set. Possible
options are:
US
Metric
Custom: allows individual changes of units for
temperature, distance, consumption, and tire
pressure.
Clock And Date
By selecting Clock and Date, the time and date can
be set. Possible options are:
Set Time: adjust hours/minutes
Set Format: adjust the time format “12h”
(12 hours) or “24h” (24 hours)
Set Date: adjust day/month/year
Security
Passenger Air Bag Disable (PAD): a selection of
Passenger Air Bag Disable (ON/OFF) may be made
if a child restraint must be installed in the front
seat. Safety And Assistance
By selecting the item Safety and Assistance, the
following adjustments can be made:
ParkSense (If Equipped): a selection of the type
of information provided by ParkSense
Front ParkSense Volume (If Equipped): selec
-
tion of the volume of the beeps provided by the
front ParkSense
Rear ParkSense Volume (If Equipped): selection
of the volume of the beeps provided by the rear
ParkSense
Forward Collision Warning (FCW) (If Equipped): a
selection of operating modes of the system
Forward Collision Warning Plus
FCW Sensitivity (If Equipped): a selection of the
“readiness” of intervention of the Forward Colli -
sion Warning Plus system, based on the
distance to the obstacle
Rain Sensing Wipers (If Equipped): enabling/
disabling the automatic operation of wipers in
the event of rain
Active Lane Management Force (If Equipped):
selection of the force to be applied to the
steering wheel to put the car in the roadway
through the system of electrical drive, in case of
operation of the system Active Lane Manage -
ment

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GETTING TO KNOW YOUR INSTRUMENT PANEL89
Loss of the battery charge may indicate one or
more of the following conditions:
The charging system cannot deliver enough
electrical power to the vehicle system because
the electrical loads are larger than the capability
of charging system. The charging system is still
functioning properly.
Turning on all possible vehicle electrical loads
(e.g. HVAC to max settings, exterior and interior
lights, overloaded power outlets +12 Volts,
150W, USB ports) during certain driving condi -
tions (city driving, towing, frequent stopping).
Installing options like additional lights, upfitter
electrical accessories, audio systems, alarms
and similar devices.
Unusual driving cycles (short trips separated by
long parking periods).
The vehicle was parked for an extended period
of time (weeks, months).
The battery was recently replaced and was not
charged completely.
The battery was discharged by an electrical load
left on when the vehicle was parked.
The battery was used for an extended period
with the engine not running to supply radio,
lights, chargers, +12 Volts portable appliances
like vacuum cleaners, game consoles and
similar devices. What to do when an electrical load reduction
action message is present (“Battery Saver On” or
“Battery Saver Mode”)
During a trip:
Reduce power to unnecessary loads if possible:

Turn off redundant lights (interior or exterior)

Check what may be plugged into power
outlets +12 Volts, 150W, USB ports
Check HVAC settings (blower, temperature)
Check the audio settings (volume)
After a trip:
Check if any aftermarket equipment was
installed (additional lights, upfitter electrical
accessories, audio systems, alarms) and review
specifications if any (load and Ignition Off Draw
currents).
Evaluate the latest driving cycles (distance,
driving time and parking time).
The vehicle should have service performed if
the message is still present during consecutive
trips and the evaluation of the vehicle and
driving pattern did not help to identify the cause.
WARNING LIGHTS AND MESSAGES
The warning/indicator lights will illuminate in the
instrument panel together with a dedicated
message and/or acoustic signal when applicable.
These indications are indicative and precautionary
and as such must not be considered as exhaustive
and/or alternative to the information contained in
the Owner’s Manual, which you are advised to read
carefully in all cases. Always refer to the
information in this chapter in the event of a failure
indication. All active telltales will display first if
applicable. The system check menu may appear
different based upon equipment options and
current vehicle status. Some telltales are optional
and may not appear.
RED WARNING LIGHTS
Air Bag Warning Light
This warning light will illuminate to
indicate a fault with the air bag, and will
turn on for four to eight seconds as a bulb
check when the ignition is placed in the
ON/RUN position. This light will illuminate with a
single chime when a fault with the air bag has been
detected, it will stay on until the fault is cleared. If
the light is either not on during startup, stays on, or
turns on while driving, have the system inspected
at an authorized dealer as soon as possible.
3

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92GETTING TO KNOW YOUR INSTRUMENT PANEL
Oil Temperature Warning Light
This warning light will illuminate to
indicate the engine oil temperature is
high. If the light turns on while driving,
stop the vehicle and shut off the engine
as soon as possible. Wait for oil temperature to
return to normal levels.
Seat Belt Reminder Warning Light
This warning light indicates when the
driver or passenger seat belt is
unbuckled. When the ignition is first
placed in the ON/RUN position and if the
driver’s seat belt is unbuckled, a chime will sound
and the light will turn on. When driving, if the driver
or front passenger seat belt remains unbuckled,
the Seat Belt Reminder Light will flash or remain on
continuously and a chime will sound Ú page 204.
Transmission Fault Warning Light
This light will illuminate (together with a
message in the instrument cluster
display and a buzzer) to indicate a
transmission fault. Contact an authorized
dealer if the message remains after restarting
the engine.

Transmission Temperature Warning Light —
If Equipped

This warning light will illuminate to warn
of a high transmission fluid temperature.
This may occur with strenuous usage
such as trailer towing. If this light turns
on, stop the vehicle and run the engine at idle or
slightly faster, with the transmission in PARK or
NEUTRAL, until the light turns off. Once the light
turns off, you may continue to drive normally.
Vehicle Security Warning Light —
If Equipped
This light will flash at a fast rate for
approximately 15 seconds when the
Vehicle Security system is arming,
and then will flash slowly until the vehicle
is disarmed.
YELLOW WARNING LIGHTS
Anti-Lock Brake System (ABS) Warning
Light
This warning light monitors the ABS.
The light will turn on when the ignition is
placed in the ON/RUN position and may
stay on for as long as four seconds.
If the ABS light remains on or turns on while
driving, then the Anti-Lock portion of the brake
system is not functioning and service is required as
soon as possible. However, the conventional brake
system will continue to operate normally,
assuming the Brake Warning Light is not also on.
If the ABS light does not turn on when the ignition
is placed in the ON/RUN position, have the brake
system inspected by an authorized dealer.WARNING!
If you continue operating the vehicle when the
Transmission Temperature Warning Light is
illuminated you could cause the fluid to boil over,
come in contact with hot engine or exhaust
components and cause a fire.
CAUTION!
Continuous driving with the Transmission
Temperature Warning Light illuminated will
eventually cause severe transmission damage
or transmission failure.

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96GETTING TO KNOW YOUR INSTRUMENT PANEL
YELLOW INDICATOR LIGHTS
4WD Low Indicator Light — If Equipped
This light alerts the driver that the vehicle
is in the 4WD Low mode. The front and
rear driveshafts are mechanically locked
together forcing the front and rear
wheels to rotate at the same speed. Low range
provides a greater gear reduction ratio to provide
increased torque at the wheels Ú page 112.
4WD Lock Indicator Light
This light alerts the driver that the vehicle
is in the 4WD Lock mode. The front and
rear driveshafts are mechanically locked
together, forcing the front and rear
wheels to rotate at the same speed Ú page 112.
Auto HOLD! Fault Indicator Light —
If Equipped
The Auto HOLD! Fault Indicator light will
illuminate if a fault is detected, it will be
indicated by a yellow HOLD! indicator
light that will stay on as long as the fault
condition exists.

Active Speed Limiter Fault Indicator Light —
If Equipped

This warning light will illuminate to signal
when there is a fault detected with the
Active Speed Limiter.
Forward Collision Warning (FCW) Indicator
Light — If Equipped
This telltale will turn on to warn you of a
possible collision with the vehicle in front
of you.
Forward Collision Warning (FCW) OFF
Indicator Light — If Equipped
This indicator light illuminates to indicate
that Forward Collision Warning is off.
Immobilizer Fail / VPS Electrical Alarm
Indicator Light
This telltale will illuminate when the
Vehicle Security system has detected an
attempt to break into the vehicle.
NOTE:After cycling the ignition to the ON/RUN position,
the Vehicle Security Warning Light could illuminate
if a problem with the system is detected. This
condition will result in the engine being shut off
after two seconds.
GREEN INDICATOR LIGHTS
Auto HOLD Indicator Light — If Equipped
Auto HOLD keeps your vehicle at a
complete stop without you having to keep
your foot on the brake pedal. Once
engaged a green HOLD indicator will
appear in the Instrument Cluster Display.
Active Lane Management Indicator Light —
If Equipped
The Active Lane Management indicator
light illuminates solid green when both
lane markings have been detected and
the system is “armed” and ready to
provide visual and torque warnings if an
unintentional lane departure occurs.
Parking/Headlights On Indicator Light
This indicator light will illuminate when
the parking lights or headlights are
turned on.
Front Fog Indicator Light — If Equipped
This indicator light will illuminate when
the front fog lights are on Ú page 43.

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98GETTING TO KNOW YOUR INSTRUMENT PANEL
GRAY INDICATOR LIGHTS
Cruise Control Ready Indicator Light —
If Equipped With Base Instrument Cluster
This light will turn on when the Cruise
Control has been turned on, but not set
Úpage 117.
ONBOARD DIAGNOSTIC SYSTEM — OBD II
Your vehicle is equipped with a sophisticated
Onboard Diagnostic system called OBD II. This
system monitors the performance of the
emissions, engine, and automatic transmission
control systems. When these systems are
operating properly, your vehicle will provide
excellent performance and fuel economy, as well
as emissions well within current government
regulations.
If any of these systems require service, the OBD II
system will turn on the Malfunction Indicator Light
(MIL). It will also store diagnostic codes and other
information to assist your service technician in
making repairs. Although your vehicle will usually
be drivable and not need towing, see an authorized
dealer for service as soon as possible.

ONBOARD DIAGNOSTIC SYSTEM (OBD II)
C
YBERSECURITY

Your vehicle is required to have an OBD II and a
connection port to allow access to information
related to the performance of your emissions
controls. Authorized service technicians may need
to access this information to assist with the
diagnosis and service of your vehicle and
emissions system Ú page 164.
CAUTION!
Prolonged driving with the MIL on could cause
further damage to the emission control
system. It could also affect fuel economy and
driveability. The vehicle must be serviced
before any emissions tests can be performed.
If the MIL is flashing while the vehicle is
running, severe catalytic converter damage
and power loss will soon occur. Immediate
service is required.
WARNING!
ONLY an authorized service technician should
connect equipment to the OBD II connection
port in order to read the VIN, diagnose, or
service your vehicle.
If unauthorized equipment is connected to the
OBD II connection port, such as a
driver-behavior tracking device, it may:
Be possible that vehicle systems,
including safety related systems, could be
impaired or a loss of vehicle control could
occur that may result in an accident
involving serious injury or death.
Access, or allow others to access, infor -
mation stored in your vehicle systems,
including personal information.

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102STARTING AND OPERATING
STOPPING THE ENGINE
Vehicles Equipped With Electronic Key (Keyless
Enter ’n Go™):
To shut off the engine with vehicle speed greater
than 5 mph (8 km/h), you must push and hold the
ignition or push the ENGINE START/STOP button
three times consecutively within a few seconds.
The engine will shut down, and the ignition will be
placed in the ON/RUN position. Turning off the car (placing the ignition from the
ON/RUN position to the OFF position), the power
supply to the accessories are maintained for a
period of three minutes.
Opening the driver’s side door with the ignition in
ON/RUN will sound a short chime that reminds the
driver to place the ignition to OFF.
When the ignition is in the OFF position, the
window switches remain active for three minutes.
Opening a front door will cancel this function.
After severe driving, idle the engine to allow the
temperature inside the engine compartment to
cool before shutting off the engine.
ENGINE BLOCK HEATER — IF EQUIPPED
The engine block heater warms the engine and
permits quicker starts in cold weather.
Connect the cord to a 110-115 Volt AC electrical
outlet with a grounded, three-wire extension cord.
For ambient temperatures below 0°F (-18°C), the
engine block heater is recommended. For ambient
temperatures below -20°F (-29°C), the engine
block heater is required.
The engine block heater cord is routed under the
hood, behind to the driver’s side headlamp.
NOTE:
The engine block heater cord is a factory
installed option. If your vehicle is not equipped,
heater cords are available from an authorized
dealer.
The engine block heater will require 110 Volt AC
and 6.5 Amps to activate the heater element.
The engine block heater must be plugged in at
least one hour to have an adequate warming
effect on the engine.
ENGINE BREAK-IN RECOMMENDATIONS
A long break-in period is not required for the engine
and drivetrain (transmission and axle) in your
vehicle.
Drive moderately during the first 300 miles
(500 km). After the initial 60 miles (100 km),
speeds up to 50 or 55 mph (80 or 90 km/h) are
desirable.
WARNING!
Never pour fuel or other flammable liquid into
the throttle body air inlet opening in an
attempt to start the vehicle. This could result
in flash fire causing serious personal injury.
Do not attempt to push or tow your vehicle to
get it started. Vehicles equipped with an auto -
matic transmission cannot be started this
way. Unburned fuel could enter the catalytic
converter and once the engine has started,
ignite and damage the converter and vehicle.
If the vehicle has a discharged battery,
booster cables may be used to obtain a start
from a booster battery or the battery in
another vehicle. This type of start can be
dangerous if done improperly Ú page 258.
WARNING!
Remember to disconnect the engine block
heater cord before driving. Damage to the
110-115 Volt electrical cord could cause
electrocution.

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STARTING AND OPERATING105
In the unlikely event of a malfunction of the EPB
system, a yellow EPB fault lamp will illuminate. This
may be accompanied by the Brake Warning Light
flashing. In this event, urgent service of the EPB
system is required. Do not rely on the parking
brake to hold the vehicle stationary.
Auto Park Brake
The EPB can be programmed to be applied
automatically whenever the vehicle speed is below
1.9 mph (3 km/h) and the transmission is placed
in PARK. Auto Park Brake is enabled and disabled
by customer selection through the Customer
Programmable Features section of the Uconnect
Settings Ú page 165.
Any single Auto Park Brake application can be
bypassed by pushing the EPB switch to the release
position while the transmission is placed in PARK
and the ignition is in the ON/RUN position.
SafeHold
SafeHold is a safety feature of the EPB system that
will engage the parking brake automatically if the
vehicle is left unsecured while the ignition switch is
in ON/RUN. For automatic transmissions, the EPB will
automatically engage if all of the following
conditions are met:
Vehicle speed is below 1.9 mph (3 km/h).
There is no attempt to press the brake pedal
and accelerator pedal.
The seat belt is unbuckled.
The driver’s door is open.
The vehicle is not in the PARK position.
SafeHold can be temporarily bypassed by pushing
the EPB switch while the driver’s door is open and
the brake pedal is pressed. Once manually
bypassed, SafeHold will be enabled again once the
vehicle reaches 12 mph (20 km/h) or the ignition
is turned to the OFF position and back to ON/RUN
again.
Auto Hold — If Equipped
Auto Hold is a comfort feature that allows the
driver to remove their foot from the brake pedal
once the vehicle has come to a stop. The vehicle
must be held at a standstill for a predetermined
amount of time by hydraulic braking. The EPB will
then engage and continue to hold the vehicle at a
stop until the driver applies the accelerator pedal. Auto Hold can be activated or deactivated by
pushing the HOLD button located on the switch
bank.

Auto Hold Switch

The following conditions must be met for Auto Hold
to activate:
Driver’s door is closed
Driver's seat belt is fastened
Vehicle is at a standstill
Forward gear is selected
Adaptive Cruise Control (ACC) is not engaged
EPB is not applied
ParkSense Active Park Assist System auto
parking maneuver is not activated
4

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