2007 JEEP LIBERTY AC System

To Accelerate for Passing
Depress the accelerator as you would normally. When the
pedal is released, the vehicle will return to the set speed.
NOTE:When driving uphill, at elevations above 2,000
ft. (610 meters), or when the vehicle is heavily loaded
(especially when towing) the vehicle may slow below the
SET speed. (If the vehicle speed drops below 35 mph (56
km/h), the Speed Control will automatically disengage).
If this happens, you can push down on the accelerator
pedal to maintain the desired speed.
A full throttle (high RPM) acceleration, while the system
is engaged, will cause the system to disengage.
Vehicles may exhibit several 4-3 downshifts under the
above conditions. To reduce the frequency of the down-
shifts and to improve vehicle performance, it is advisable
to lock out overdrive. Press the O/D OFF button on the
right side of the shift lever.WARNING!
Leaving the Speed Control on when not in use is
dangerous. You could accidentally set the system or
cause it to go faster than you want. You could lose
control and have an accident. Always turn the system
off when you are not using it.
ELECTRONIC BRAKE CONTROL SYSTEM
Your vehicle is equipped with an advanced electronic
brake control system that includes ABS (Anti-Lock Brake
System), TCS (Traction Control System), BAS (Brake
Assist System), ERM (Electronic Roll Mitigation) and ESP
(Electronic Stability Program). All five systems work
together to enhance vehicle stability and control in vari-
ous driving conditions are commonly referred to as ESP.
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ABS (Anti-Lock Brake System)
This system aids the driver in maintaining vehicle control
under adverse braking conditions. The system controls
hydraulic brake pressure to prevent wheel lock-up and
help avoid skidding on slippery surfaces during braking.
Refer to “Anti-Lock Brake System” in Section 5 of this
manual for more information about ABS.
WARNING!
ABS (Anti-Lock Brake System) cannot prevent the
natural laws of physics from acting on the vehicle,
nor can it increase the traction afforded by prevail-
ing road conditions. ABS cannot prevent accidents,
including those resulting from excessive speed in
turns, driving on very slippery surfaces, or hydro-
planing. Only a safe, attentive, and skillful driver
can prevent accidents. The capabilities of an ABS-
equipped vehicle must never be exploited in a reck-
less or dangerous manner which could jeopardize
the user’s safety or the safety of others.
126 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

TCS (Traction Control System)
This system monitors the amount of wheel spin of each of
the driven wheels. If wheel spin is detected, brake
pressure is applied to the slipping wheel(s) and engine
power is reduced to provide enhanced acceleration and
stability. A feature of the TCS system functions similar to
a limited slip differential and controls the wheel spin
across a driven axle. If one wheel on a driven axle is
spinning faster than the other, the system will apply the
brake of the spinning wheel. This will allow more engine
torque to be applied to the wheel that is not spinning.
This feature remains active even if TCS and ESP are in the
“Partial Off” mode. Refer to “ESP (Electronic Stability
Program)” in this section.
BAS (Brake Assist System)
The BAS is designed to optimize the vehicle’s braking
capability during emergency braking maneuvers. The
system detects an emergency braking situation by sens-
ing the rate and amount of brake application and then
applies optimum pressure to the brakes. This can help
reduce braking distances. The BAS complements the
anti-lock brake system (ABS). Applying the brakes very
quickly results in the best BAS assistance. To receive the
benefit of the system, you must apply continuous brak-
ing pressure during the stopping sequence. Do not
reduce brake pedal pressure unless braking is no longer
desired. Once the brake pedal is released, the BAS is
deactivated.
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WARNING!
BAS (Brake Assist System) cannot prevent the natu-
ral laws of physics from acting on the vehicle, nor
can it increase the traction afforded by prevailing
road conditions. BAS cannot prevent accidents, in-
cluding those resulting from excessive speed in
turns, driving on very slippery surfaces, or hydro-
planing. Only a safe, attentive, and skillful driver
can prevent accidents. The capabilities of a BAS-
equipped vehicle must never be exploited in a reck-
less or dangerous manner which could jeopardize
the user’s safety or the safety of others.
ERM (Electronic Roll Mitigation)
This system anticipates the potential for wheel lift by
monitoring the driver ’s steering wheel input and the
speed of the vehicle. When ERM determines that the rate
of change of the steering wheel angle and vehicles speed
are sufficient to potentially cause wheel lift, it applies the
appropriate brake and may reduce engine power to
lessen the chance that wheel lift will occur. ERM will only
intervene during very severe or evasive driving maneu-
vers. ERM can only reduce the chance of wheel lift
occurring during severe or evasive driving maneuvers. It
can not prevent wheel lift due to other factors such as
road conditions, leaving the roadway or striking objects
or other vehicles.
128 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

WARNING!
Many factors, such as vehicle loading, road condi-
tions and driving conditions, influence the chance
that wheel lift or rollover may occur. ERM can not
prevent all wheel lift or rollovers, especially those
that involve leaving the roadway or striking objects
or other vehicles. Only a safe, attentive, and skillful
driver can prevent accidents. The capabilities of an
ERM-equipped vehicle must never be exploited in a
reckless or dangerous manner which could jeopar-
dize the user’s safety or the safety of others.
ESP (Electronic Stability Program)
This system enhances directional control and stability of
the vehicle under various driving conditions. ESP cor-
rects for over/under steering of the vehicle by applyingthe brake of the appropriate wheel to assist in counter-
acting the over/under steer condition. Engine power
may also be reduced to help the vehicle maintain the
desired path.
ESP uses sensors in the vehicle to determine the vehicle
path intended by the driver and compares it to the actual
path of the vehicle. When the actual path does not match
the intended path, ESP applies the brake of the appropri-
ate wheel to assist in counteracting the oversteer or
understeer condition.
•Oversteer - when the vehicle is turning more than
appropriate for the steering wheel position.
•Understeer - when the vehicle is turning less than
appropriate for the steering wheel position.
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ESP/TCS Indicator Light
TheESP/TCS Indicator Lightlocated in the
instrument cluster, starts to flash as soon as the
tires lose traction and the ESP system becomes
active. TheESP/TCS Indicator Lightalso
flashes when TCS is active. If theESP/TCS Indicator
Lightbegins to flash during acceleration, ease up on the
accelerator and apply as little throttle as possible. Be sure
to adapt your speed and driving to the prevailing road
conditions.WARNING!
ESP (Electronic Stability Program) cannot prevent
the natural laws of physics from acting on the
vehicle, nor can it increase the traction afforded by
prevailing road conditions. ESP cannot prevent acci-
dents, including those resulting from excessive
speed in turns, driving on very slippery surfaces, or
hydroplaning. Only a safe, attentive, and skillful
driver can prevent accidents. The capabilities of an
ESP-equipped vehicle must never be exploited in a
reckless or dangerous manner which could jeopar-
dize the user’s safety or the safety of others.
The ESP system has 2 available operating modes in 2WD,
4WD Part Time, 4WD Full Time (Selec-Trac Only), and on
2WD vehicles. The system has a single operating mode in
4WD Low Range.
130 UNDERSTANDING THE FEATURES OF YOUR VEHICLE

High Range (4WD Part Time, 4WD Full Time) or
2WD Models
ESP On
This is the normal operating mode for ESP in 2WD, 4WD
Part Time, 4WD Full Time (Selec-Trac Only), and on 2WD
vehicles. Whenever the vehicle is started or the transfer
case (if equipped) is shifted from 4WD low range or
neutral back to 4WD high range or 2WD, the ESP system
will be in this mode. This mode should be used for most
all driving situations. ESP should only be turned off for
specific reasons as noted below.
Partial Off
This mode is entered by momentarily depressing the “ESP
Control Switch” (located on top of the steering column).
When in “Partial Off” mode, the TCS portion of ESP,
except for the “limited slip” feature described in the TCS
section, has been disabled and the “ESP/TCS Indicator
Light” will be illuminated. All other stability features ofESP function normally. This mode is intended to be used
if the vehicle is in deep snow, sand or gravel conditions
and more wheel spin than ESP would normally allow is
required to gain traction. To turn ESP on again, momen-
tarily depress the “ESP Control Switch”. This will restore
the normal “ESP On” mode of operation.
ESP Control Switch
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NOTE:To improve the vehicle’s traction when driving
with snow chains, or starting off in deep snow, sand or
gravel, it may be desirable to switch to the “Partial Off”
mode by pressing the ESP switch. Once the situation
requiring ESP to be switched to the “Partial Off” mode is
overcome, turn ESP back on by momentarily depressing
the “ESP Control Switch”. This may be done while the
vehicle is in motion.
4WD Low Range
Partial Off
This is the normal operating mode for ESP in 4WD low
range. Whenever the vehicle is started in 4WD low range
or the transfer case (if equipped) is shifted from 2WD,
4WD high range, or neutral to 4WD low range, the ESP
system will be in this mode. In 4WD low range, ESP and
TCS, except for the “limited slip” feature described in the
TCS section, are turned off until the vehicle reaches a
speed of 30 mph (48 km/h). At 30 mph (48 km/h), thenormal ESP stability function returns but TCS remains
off. When the vehicle speed drops below 25 mph (40
km/h) the ESP system shuts off. ESP is off at low vehicle
speeds in 4WD low range so that it will not interfere with
off-road driving but ESP function returns to provide the
stability feature at speeds above 30 mph (48 km/h). The
“ESP/TCS Indicator Light” will always be illuminated in
4WD low range when ESP is off.
ESP/BAS Warning Lamp
The malfunction indicator lamp for the ESP is
combined with BAS. The “ESP/BAS Warning
Lamp” and the “ESP/TCS Indicator Light” in
the instrument cluster both come on when the
ignition switch is turned to the “ON” position. They
should go out with the engine running. If the “ESP/BAS
Warning Lamp” comes on continuously with the engine
running, a malfunction has been detected in either the
ESP or the BAS system. If this light remains on after
several ignition cycles, and the vehicle has been driven
132 UNDERSTANDING THE FEATURES OF YOUR VEHICLE