2019 Alfa Romeo 4C Spider wheel

68°F (20°C) and the measured tire pressure is 27 psi
(186 kPa), a temperature drop to 20°F (-7°C) will
decrease the tire pressure to approximately 23 psi
(158 kPa). This tire pressure is sufficiently low enough
to turn ON the TPMS Warning Light. Driving the
vehicle may cause the tire pressure to rise to approxi-
mately 27 psi (186 kPa), but the TPMS Warning Light
will still be ON. In this situation, the TPMS Warning
Light will turn OFF only after the tires are inflated to the
vehicle’s recommended cold placard pressure value.
CAUTION!
•The TPMS has been optimized for the original
equipment tires and wheels. TPMS pressures and
warnings have been established for the tire size
equipped on your vehicle. Undesirable system
operation or sensor damage may result when
using replacement equipment that is not of the
same size, type, and/or style. Aftermarket wheels
can cause sensor damage. Using aftermarket tire
sealants may cause the Tire Pressure Monitoring
System (TPMS) sensor to become inoperable.
(Continued)
CAUTION! (Continued)
After using an aftermarket tire sealant it is recom-
mended that you take your vehicle to an autho-
rized dealer to have your sensor function checked.
• After inspecting or adjusting the tire pressure,
always reinstall the valve stem cap. This will
prevent moisture and dirt from entering the valve
stem, which could damage the Tire Pressure
Monitoring Sensor.
NOTE:
• The TPMS is not intended to replace normal tire care
and maintenance, or to provide warning of a tire
failure or condition.
• The TPMS should not be used as a tire pressure
gauge while adjusting your tire pressure.
• Driving on a significantly under-inflated tire causes
the tire to overheat and can lead to tire failure.
Under-inflation also reduces fuel efficiency and tire
tread life, and may affect the vehicle’s handling and
stopping ability.
• The TPMS is not a substitute for proper tire mainte-
nance, and it is the driver ’s responsibility to maintain
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SAFETY 95

correct tire pressure using an accurate tire gauge,
even if under-inflation has not reached the level to
trigger illumination of the TPMS Warning Light.
• Seasonal temperature changes will affect tire pres-
sure, and the TPMS will monitor the actual tire
pressure in the tire.
Base System
This is the TPMS warning indicator located in
the instrument cluster.
The TPMS uses wireless technology with
wheel rim mounted electronic sensors to monitor tire
pressure levels. Sensors, mounted to each wheel as part
of the valve stem, transmit tire pressure readings to the
Receiver Module.
NOTE: It is particularly important for you to check the
tire pressure in all of the tires on your vehicle regularly
and to maintain the proper pressure. The TPMS consists of the following components:
•
Receiver Module.
• Four Tire Pressure Monitoring Sensors.
• Tire Pressure Monitoring System Warning Light.
Tire Pressure Monitoring Low Pressure Warnings
The TPMS Warning Light will illuminate in the instru-
ment cluster, an acoustic signal will be activated, and
the “Check left or right front/rear tire” text message
will display when one or more of the four active road
tire pressures are low. Should this occur, you should
stop as soon as possible, check the inflation pressure of
each tire on your vehicle, and inflate each tire to the
vehicle’s recommended cold placard pressure value.
The system will automatically update and the Tire
Pressure Monitoring Light will extinguish once the
updated tire pressures have been received. The vehicle
may need to be driven for up to 20 minutes above
15 mph (24 km/h) to receive this information.
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Check TPMS Warnings
The TPMS Warning Light will flash on and off for 75
seconds and remain on solid when a system fault is
detected, the “TIRE PRESSURE MONITORING UN-
AVAILABLE” text message will display. If the ignition
key is cycled, this sequence will repeat providing the
system fault still exists. The TPMS Warning Light will
turn off when the fault condition no longer exists. A
system fault can occur with any of the following
scenarios:
1. Jamming due to electronic devices or driving next tofacilities emitting the same radio frequencies as the
TPM sensors.
2. Installing some form of aftermarket window tinting that affects radio wave signals.
3. Snow or ice around the wheels or wheel housings.
4. Using tire chains on the vehicle.
5. Using wheels/tires not equipped with TPM sensors.
NOTE: Your vehicle may be equipped with a compact
spare wheel and tire assembly. 1. The compact spare tire does not have a tire pressure
monitoring sensor. Therefore, the TPMS will not
monitor the tire pressure in the compact spare tire.
2. If you install the compact spare tire in place of a road tire that has a pressure below the low-pressure
warning limit, upon the next ignition key cycle, a
chime will sound and the TPMS Warning Light will
still turn ON due to the low tire.
3. However, after driving the vehicle for up to 20 minutes above 15 mph (24 km/h), the TPMS Warn-
ing Light will flash on and off for 75 seconds and
then remain on solid.
4. This occurs for each subsequent ignition key cycle, a chime will sound and the TPMS Warning Light will
flash on and off for 75 seconds and then remain on
solid.
5. Once you repair or replace the original road tire and reinstall it on the vehicle in place of the compact
spare tire, the TPMS will update automatically and
the TPMS Warning Light will turn OFF, as long as no
tire pressure is below the low-pressure warning limit
in any of the four active road tires. The vehicle may
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SAFETY 97

WARNING!
•The seat belt assembly must be replaced if the
switchable Automatic Locking Retractor (ALR)
feature or any other seat belt function is not
working properly when checked according to the
procedures in the Service Manual.
• Failure to replace the seat belt assembly could
increase the risk of injury in collisions.
• Do not use the Automatic Locking Mode to re-
strain occupants who are wearing the seat belt or
children who are using booster seats. The locked
mode is only used to install rear-facing or
forward-facing child restraints that have a har-
ness for restraining the child.
Supplemental Restraint Systems (SRS)
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.
The air bag system must be ready to protect you in a
collision. The Occupant Restraint Controller (ORC) monitors the internal circuits and interconnecting wir-
ing associated with the electrical Air Bag System Com-
ponents. Your vehicle may be equipped with the fol-
lowing Air Bag System Components:
Air Bag System Components
•
Occupant Restraint Controller (ORC)
• Air Bag Warning Light
•Steering Wheel and Column
• Instrument Panel
• Knee Impact Bolsters
• Driver and Front Passenger Air Bags
• Seat Belt Buckle Switch
• Supplemental Side Air Bags
• Supplemental Knee Air Bags
• Front and Side Impact Sensors
• Seat Belt Pretensioners
• Seat Track Position Sensors
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WARNING!
Ignoring the Air Bag Warning Light in your instru-
ment panel could mean you won’t have the air bag
system to protect you in a collision. If the light does
not come on as a bulb check when the ignition is
first turned on, stays on after you start the vehicle,
or if it comes on as you drive, have an authorized
dealer service the air bag system immediately.
Front Air Bags
This vehicle has front air bags and lap/shoulder belts
for both the driver and front passenger. The front air
bags are a supplement to the seat belt restraint systems.
The driver front air bag is mounted in the center of the
steering wheel. The passenger front air bag is mounted
in the instrument panel, above the glove compartment.
The words “SRS AIRBAG” or “AIRBAG” are embossed
on the air bag covers.
WARNING!
•Being too close to the steering wheel or instru-
ment panel during front air bag deployment
could cause serious injury, including death. Air
bags need room to inflate. Sit back, comfortably
(Continued)
Front Air Bag/Knee Bolster Locations
1 — Driver And Passenger Front Air Bags
2 — Passenger Knee Impact Bolster
3 — Driver Knee Impact Bolster/Supplemental Driver Knee Air
Bag
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WARNING!(Continued)
extending your arms to reach the steering wheel
or instrument panel.
• Never place a rear-facing child restraint in front of
an air bag. A deploying passenger front air bag
can cause death or serious injury to a child 12
years or younger, including a child in a rear-
facing child restraint.
• Never install a rear-facing child restraint in the
front seat of a vehicle. Only use a rear-facing child
restraint in the rear seat. If the vehicle does not
have a rear seat, do not transport a rear-facing
child restraint in that vehicle.
Driver And Passenger Front Air Bag Features
The Advanced Front Air Bag system has multistage
driver and front passenger air bags. This system pro-
vides output appropriate to the severity and type of
collision as determined by the Occupant Restraint Con-
troller (ORC), which may receive information from the
front impact sensors (if equipped) or other system
components.
The first stage inflator is triggered immediately during
an impact that requires air bag deployment. A low energy output is used in less severe collisions. A higher
energy output is used for more severe collisions.
This vehicle may be equipped with a driver and/or
front passenger seat belt buckle switch that detects
whether the driver or front passenger seat belt is
buckled. The seat belt buckle switch may adjust the
inflation rate of the Advanced Front Air Bags.
This vehicle may be equipped with driver and/or front
passenger seat track position sensors that may adjust
the inflation rate of the Advanced Front Air Bags based
upon seat position.
WARNING!
•
No objects should be placed over or near the air
bag on the instrument panel or steering wheel
because any such objects could cause harm if the
vehicle is in a collision severe enough to cause the
air bag to inflate.
• Do not put anything on or around the air bag
covers or attempt to open them manually. You
may damage the air bags and you could be
injured because the air bags may no longer be
(Continued)
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SAFETY 111

WARNING!(Continued)
functional. The protective covers for the air bag
cushions are designed to open only when the air
bags are inflating.
• 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, air bags won’t deploy at all.
Always wear your seat belts even though you
have air bags.
Front Air Bag Operation
Front Air Bags are designed to provide additional
protection by supplementing the seat belts. Front air
bags are not expected to reduce the risk of injury in rear,
side, or rollover collisions. The front air bags will not
deploy in all frontal collisions, including some that may
produce substantial vehicle damage — for example,
some pole collisions, truck underrides, and angle offset
collisions.
On the other hand, depending on the type and location
of impact, front air bags may deploy in crashes with
little vehicle front-end damage but that produce a
severe initial deceleration. Because air bag sensors measure vehicle deceleration
over time, vehicle speed and damage by themselves are
not good indicators of whether or not an air bag should
have deployed.
Seat belts are necessary for your protection in all
collisions, and also are needed to help keep you in
position, away from an inflating air bag.
When the ORC detects a collision requiring the front air
bags, it signals the inflator units. A large quantity of
non-toxic gas is generated to inflate the front air bags.
The steering wheel hub trim cover and the upper
passenger side of the instrument panel separate and
fold out of the way as the air bags inflate to their full
size. The front air bags fully inflate in less time than it
takes to blink your eyes. The front air bags then quickly
deflate while helping to restrain the driver and front
passenger.
Knee Impact Bolsters
The Knee Impact Bolsters help protect the knees of the
driver and front passenger, and position the front
occupants for improved interaction with the front air
bags.
112 SAFETY

WARNING!
•Occupants, including children, who are up
against or very close to Side Air Bags can be
seriously injured or killed. Occupants, including
children, should never lean on or sleep against
the door, side windows, or area where the side air
bags inflate, even if they are in an infant or child
restraint.
• Seat belts (and child restraints where appropriate)
are necessary for your protection in all collisions.
They also help keep you in position, away from
an inflating Side Air Bag. To get the best protec-
tion from the Side Air Bags, occupants must wear
their seat belts properly and sit upright with their
backs against the seats. Children must be prop-
erly restrained in a child restraint or booster seat
that is appropriate for the size of the child.
WARNING!
• Side Air Bags need room to inflate. Do not lean
against the door or window. Sit upright in the
center of the seat.
(Continued)
WARNING! (Continued)
•Being too close to the Side Air Bags during
deployment could cause you to be severely in-
jured or killed.
• Relying on the Side Air Bags alone could lead to
more severe injuries in a collision. The Side Air
Bags work with your seat belt to restrain you
properly. In some collisions, Side Air Bags won’t
deploy at all. Always wear your seat belt even
though you have Side Air Bags.
NOTE: Air bag covers may not be obvious in the
interior trim, but they will open during air bag deploy-
ment.
Air Bag System Components
NOTE: The Occupant Restraint Controller (ORC) moni-
tors the internal circuits and interconnecting wiring
associated with electrical Air Bag System Components
listed below:
• Occupant Restraint Controller (ORC)
• Air Bag Warning Light
•Steering Wheel and Column
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SAFETY 115