Jaguar XJ (X350). Manual — part 1565

second stage deployment, depending on the occupant status and the crash severity. It consists
of a two stage inflator with two air bag electrical connectors to accommodate the two stage
inflation.

The heated gas inflator consists of a high-pressure mix of clean air and hydrogen gas,
triggered by two separate ignition squibs. It produces a controlled generation of clean gas to
rapidly fill the air bag. It is classified as a stored flammable gas (not as an explosive) and as
such, has less restrictive storage and transportation requirements. It produces a very clean
burn and almost no particulates and is almost free of any toxins, making disposal or recycling
much easier.

Side Air Bag Module

NOTE:

In the event of a side impact that is sufficient to deploy the side air bag system, it will be
necessary to replace the complete seat. The side air bag module does not contain any
serviceable components.

The side air bag module is mounted in the outboard bolster of each front seat and uses
compressed gas to inflate. It provides protection for the thorax (the part of the trunk between
the neck and the abdomen). In an air bag deployment situation, it deploys through the stitch
seam in the side bolster. To ensure the air bag always emerges at the same point, a chute is
attached to the inside of the trim cover and wrapped around the air bag module.

Side Air Curtain Module

NOTE:

In the event of a side impact that is sufficient to deploy the side air curtain module, it will
be necessary to replace the headliner, A-pillar and C-pillar trim panels and the B-pillar
upper trim panel will require thorough examination for visible damage or deformation
before it can be used again on the vehicle.

NOTE:

The side air curtain module does not contain any serviceable components.

The side air curtain modules are located under the headliner between the A and C-pillar and
deploy at the same time as the corresponding side air bag module. If the passenger air bag
module is deactivated the corresponding side air bag module is also deactivated, however the
side air curtain module will still deploy to afford protection to any corresponding rear
occupant. When deployed, the side air curtain extends down to approximately shoulder height
to protect both the front and rear occupants heads. Both the front and rear of the side air
curtain modules are retained to the A and C-pillar respectively by tethers.

Pretensioners

WARNING: Prior to the removal of any SRS pretensioners and before

disconnecting any SRS pretensioer electrical connectors, the battery ground cable must
be disconnected and a period of one minute allowed to elapse.

NOTE:

The SRS pretensioners do not contain any serviceable components.

The SRS consists of the following pretensioners:

Safety Belt Buckle Pretensioners

The front safety belt buckle and pretensioners are seat mounted and incorporate a safety
buckle switch. In the event of a front impact the RCM will deploy the pretensioners provided
the safety belt buckles are fastened. The safety belt buckle pretensioners have a lower
deployment threshold than that required by the air bags. Hence it is possible during a minor
collision, which exceeds the deployment threshold, that only the safety belt buckle
pretensioners will deploy. The RCM receives information on the status of the safety belt
buckles from a switch contained in the buckle. For additional information, refer to Safety
Belt System (501-20A)

Rear Safety Belt Pretensioners

Each rear safety belt incorporates a pretensioner device. In the event of low/high speed frontal
impact, these provide additional occupant protection by removing any excess slack from the
safety belts. Safety belt pretensioners activate when a frontal impact of sufficient force occurs.
Under such an impact, the RCM installed on the transmission tunnel sends a firing signal to
each pretensioner. Receipt of this signal by each pretensioner directly triggers a pyrotechnic
igniter unit. The seat belt retractors and pretensioners are not serviceable components and
dismantling must not be attempted as active pretensioning components contain a solid,
flammable material. For additional information, refer to Safety Belt System (501-20A)

Indicators

WARNING: Prior to the removal of any SRS Indicators and before disconnecting

any SRS indicator electrical connectors, the battery ground cable must be disconnected
and a period of one minute allowed to elapse.

NOTE:

The SRS indicators do not contain any serviceable components.

The SRS consists of the following indicators:

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The SRS indicator is located in the instrument cluster and is driven by the RCM. Malfunction
of SRS components or associated circuits will cause the SRS indicator to illuminate. If the
warning lamp fails, a fault code is recorded and a warning tone is sounded.

Passenger Air Bag Module Deactivation (PAD) Indicator

The passenger air bag deployment door has a built in lens that displays the passenger air bag
module deactivated symbol. The symbol is backlit by the PAD indicator, which is attached to
the instrument panel. The illumination of the symbol informs the front seat occupants whether
or not the passenger air bag module has been deactivated by the occupancy sensing system.

Clockspring

WARNING: Prior to the removal of the SRS clockspring and before

disconnecting any SRS clockspring electrical connectors, the battery ground cable must
be disconnected and a period of one minute allowed to elapse.

NOTE:

The SRS clockspring does not contain any serviceable components.

The clockspring is designed to carry signals between the RCM and the driver air bag module.
The clockspring is fitted to the steering column, and consists of fixed and moving parts
connected by a coiled tape with integral conducting tracks. The tape is able to 'wind up' and
'unwind' as the steering wheel (to which the moving part is attached) is turned, maintaining
electrical contact at all times between the RCM and the driver air bag module.

SRS Indicator

Diagnosis and testing

Air Bag Supplemental Restraint System
(SRS)

Principles of Operation

For a detailed description of the Air Bag Supplemental Restraint System (SRS), refer to the
relevant Description and Operation sections in the workshop manual.
Air Bag Supplemental Restraint System (SRS)

Inspection and Verification

WARNING: TO AVOID ACCIDENTAL DEPLOYMENT AND POSSIBLE

PERSONAL INJURY, THE BACKUP POWER SUPPLY MUST BE DEPLETED
BEFORE REPAIRING OR REPLACING ANY AIR BAG SUPPLEMENTAL
RESTRAINT SYSTEM (SRS) COMPONENTS. TO DEPLETE THE BACKUP
POWER SUPPLY ENERGY, DISCONNECT THE BATTERY GROUND CABLE
AND WAIT ONE MINUTE. FAILURE TO FOLLOW THIS INSTRUCTION MAY
RESULT IN PERSONAL INJURY.

NOTE:

Given the legal implications of a restraints system failure, harness repairs to airbag
module circuits are not acceptable. Where the text refers to "REPAIR the circuit", this
will normally mean the replacement of a harness.

If the Jaguar approved diagnostic system is not available, use a scan tool to extract DTCs and
follow the pinpoint diagnostics in this section.

1 . Verify the customer concern by operating the system.

2 . Confirm the function of the warning lamp (if the warning lamp is inoperative, system
faults will be signalled by an audible chime).

3 . Visually inspect for obvious signs of damage and system integrity.

Electrical

•

Fuses/Relays

•

Damaged, Loose or Corroded Connector(s)

•

Damage to Wiring Loom/Incorrect Location, Stretched or Taught

4 . If an obvious cause for an observed or reported concern is found, correct the cause before

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