Ford Crown Victoria (2011 year). Manual — part 28

How does the airbag supplemental restraint system work?

The airbag SRS is designed to
activate when the vehicle sustains
longitudinal deceleration sufficient
to cause the sensors to close an
electrical circuit that initiates airbag
inflation.

The fact that the airbags did not
inflate in a collision does not mean
that something is wrong with the
system. Rather, it means the forces
were not of the type sufficient to
cause activation. Driver and passenger airbags are designed to inflate in
frontal and near-frontal collisions, not rollover, side-impact, or
rear-impacts unless the collision causes sufficient longitudinal
deceleration.

The airbags inflate and deflate
rapidly upon activation. After airbag
deployment, it is normal to notice a
smoke-like, powdery residue or
smell the burnt propellant. This may
consist of cornstarch, talcum
powder (to lubricate the bag) or
sodium compounds (e.g., baking
soda) that result from the
combustion process that inflates the
airbag. Small amounts of sodium
hydroxide may be present which
may irritate the skin and eyes, but
none of the residue is toxic.

While the system is designed to help
reduce serious injuries, contact with
a deploying airbag may also cause abrasions, swelling or temporary
hearing loss. Because airbags must inflate rapidly and with considerable
force, there is the risk of death or serious injuries such as fractures,
facial and eye injuries or internal injuries, particularly to occupants who
are not properly restrained or are otherwise out of position at the time
of airbag deployment. Thus, it is extremely important that occupants be
properly restrained as far away from the airbag module as possible while
maintaining vehicle control.

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The SRS consists of the following items:
• Driver and passenger airbag modules (which include the inflators and

airbags)

• safety belt pretensioners
• Front passenger sensing system
• “Passenger airbag off” or “pass airbag off” indicator lamp. Refer to

Front passenger sensing system later in this chapter.

• Driver and passenger side airbags
• Seat-mounted side airbag system.
• One or more impact and safing sensors
• A readiness light and tone
• A diagnostic module
• The electrical wiring which connects the components
The diagnostic module monitors its own internal circuits as well as the
supplemental airbag electrical system wiring (including the impact
sensors), the system wiring, the airbag system readiness light, the airbag
backup power and the airbag ignitors.

WARNING: Several air bag system components get hot after
inflation. Do not touch them after inflation.

WARNING: If the air bag has deployed, the air bag will not
function again and must be replaced immediately. If the air

bag is not replaced, the unrepaired area will increase the risk of injury
in a collision.

WARNING: If the safety belt pretensioners deploy in an
accident, they will not function again (belt will not extract or

retract) and must be replaced immediately. Failure to replace the
retractor assemblies will increase the risk of injury.

Front passenger sensing system

The front passenger sensing system is designed to meet the regulatory
requirements of Federal Motor Vehicle Safety Standard (FMVSS) 208
and is designed to disable (will not inflate) the front passenger’s frontal
airbag under certain conditions.

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The front passenger sensing system works with sensors that are part of
the front passenger’s seat and safety belt. The sensors are designed to
detect the presence of a properly seated occupant and determine if the
front passenger’s frontal airbag should be enabled (may inflate) or
disabled (will not inflate).

The front passenger sensing system will disable (will not inflate) the
front passenger’s frontal airbag if:
• the front passenger seat is unoccupied, or has small/medium objects in

the front seat,

• the system determines that an infant is present in a rear-facing infant

seat that is installed according to the manufacturer’s instructions,

• the system determines that a small child is present in a forward-facing

child restraint that is installed according to the manufacturer’s
instructions,

• the system determines that a small child is present in a booster seat,
• a front passenger takes his/her weight off of the seat for a period of

time.

Note: When the passenger airbag off light is illuminated, the passenger
(seat mounted) side airbag may be disabled to avoid the risk of airbag
deployment injuries.

The front passenger sensing system
uses a

⬙passenger airbag off⬙ or

⬙pass airbag off⬙ indicator which will
illuminate and stay lit to remind you
that the front passenger frontal
airbag is disabled. The indicator
lamp is located on the instrument panel to the right of the radio over the
glove box.

Note: The indicator lamp will illuminate for a short period of time when
the ignition is turned to the on position to confirm it is functional.

When the front passenger seat is not occupied (empty seat) or in the
event that the front passenger frontal airbag is enabled (may inflate), the
indicator lamp will be unlit.

The front passenger sensing system is designed to disable (will not
inflate) the front passenger’s frontal airbag when a rear facing infant
seat, a forward-facing child restraint, or a booster seat is detected.
• When the front passenger sensing system disables (will not inflate)

the front passenger frontal airbag, the indicator lamp will illuminate
and stay lit to remind you that the front passenger frontal airbag is
disabled.

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• If the child restraint has been installed and the indicator lamp is not

lit, then turn the vehicle off, remove the child restraint from the
vehicle and reinstall the restraint following the child restraint
manufacturer’s instructions.

The front passenger sensing system is designed to enable (may inflate)
the front passenger’s frontal airbag anytime the system senses that a
person of adult size is sitting properly in the front passenger seat.
• When the front passenger sensing system enables the front passenger

frontal airbag (may inflate), the indicator will be unlit and stay unlit.

If a person of adult size is sitting in the front passenger’s seat, but the

⬙passenger airbag off⬙ or ⬙pass airbag off⬙ indicator lamp is lit, it is
possible that the person isn’t sitting properly in the seat. If this happens:
• Turn the vehicle off and ask the person to place the seatback in the

full upright position.

• Have the person sit upright in the seat, centered on the seat cushion,

with the person’s legs comfortably extended.

• Restart the vehicle and have the person remain in this position for

about two minutes. This will allow the system to detect that person
and enable the passenger’s frontal airbag.

• If the indicator lamp remains lit even after this, the person should be

advised to ride in the rear seat.

Occupant

Pass Airbag Off
Indicator Lamp

Passenger Airbag

Empty seat

Unlit

Disabled

Small child in child
safety seat or booster

Lit

Disabled

Small child with safety
belt buckled or
unbuckled

Lit

Disabled

Adult

Unlit

Enabled

WARNING: Even with Advanced Restraints Systems, children
12 and under should be properly restrained in a rear seating

position.

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