Jaguar XJ (X350). Manual — part 1230

Auxiliary Climate Control – Armoured

WARNING: The compressed air cylinder valve must be open for the fresh air system to operate.

Item Part Number

Description

1

Fresh air supply switch

NOTE:

The duration of the air supply is dependant on the pressure in the compressed air cylinder, how many people are using the
system and their breathing rate.

Fresh Air System

This fresh air system provides fresh air to the vehicle occupants by means of individual masks in the event
that the exterior or ambient air becomes contaminated. The masks are to be connected to the individual
connection points located on the floor console of the vehicle. The fresh air system comprises a compressed
air cylinder mounted in the rear of the luggage compartment. The compressed air cylinder incorporates a
manually operated on/off valve with integral pressure gauge graduated from 0 bar (0 lbf/in²) - 400 bar (5802
lbf/in²). The compressed air cylinder valve must be open for the fresh air system to operate. A regulator
valve and high pressure gauge are connected to the compressed air cylinder by means of a hand tightened
connector. There is a protective shield fitted around the regulator valve. The high pressure gauge is
graduated from 0 bar (0 lbf/in²) – 315 bar (4569 lbf/in²) and displays the pressure in the compressed air
cylinder. The regulator valve is factory set to supply air at a pressure of 6.2 bar (90 lbf/in²) – 7.0 bar ( 102
lbf/in²) to the mask. (This effectively pressurizes the mask, restricting ambient air from leaking into the
mask). In the event of a system malfunction and the supply pressure exceeding 12 bar (174 lbf/in²), a
pressure relief valve opens. The regulator valve is connected to an electrically operated solenoid valve by a
flexible hose. The solenoid valve is connected to the manifold block. Connections to this manifold are by
means of quick release connectors. A pressure gauge situated in the manifold displays the regulated air
supply pressure 6.2 bar (90 lbf/in²) – 7.0 bar ( 102 lbf/in²). Four branches are taken from this manifold to
supply the individual occupants of the vehicle. When connected to the supply point on the vehicle floor
console, air is supplied into the mask by a demand valve. Exhaled air is released from the mask by means of
an exhaust valve set to between 5.0 millibar (0.07 lbf/in²) – 6.0 millibar (0.09 lbf/in²). The demand valve is
attached to the mask by either 2 or 4 buttons. It can only be detached from the mask by using two hands to
simultaneously press the release buttons. Pressing the release button on the front of the demand valve
operates the bypass which increases the supply of compressed air into the mask if required. It can also be
used to purge the system after use. The system is activated by pressing the blue button on the switch pack
mounted to the centre console. This opens the solenoid connected to the manifold which permits air to flow
to the 4 individual connection points in the vehicle. Air is only released to the occupants when the masks are
plugged into these individual connection points.

Published: Mar 12, 2014

Vehicles

NOTE:

Vehicles subjected to use in arduous conditions, it is advisable to undertake the system maintenance more frequently.

Maintenance

When charging the compressed air cylinder, European standards relating to use of stored breathable air shall
be observed. Changing the mask demand valve diaphragm – it is recommended that this operation be
undertaken by a specialist company or a new demand valve be purchased from the original equipment
supplier. NOTE:- the complete fresh air system must be checked and tested after replacing any of the
functional components. NOTE:- the pressure regulator is factory sealed with a lead pin and painted with
varnish. The performance of a regulator without this seal cannot be guaranteed. Cleaning, disinfecting and
drying instructions – refer to vehicle handbook. After each usage – wash, disinfect and dry masks; check and
if necessary recharge compressed air cylinder. Every 12 months – check system operation from each seating
position in the car. Every 5 years – check all valves and regulator, replace perishable parts of face mask and
flexible hoses that connect masks to the air connection point.

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Diagnosis and testing

Auxiliary Climate Control

Principles of Operation

For a detailed description of the Climate Control system, refer to the relevant Description and

Operation sections in the workshop manual.

Auxiliary Climate Control

Inspection and Verification

1 . Verify the customer concern by operating the system.

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

Visual Inspection Chart

Mechanical

Electrical

•

Coolant Level

•

Fuses/Relays

•

Damaged, Loose or Corroded Connector(s)

•

Damage to Wiring Loom/Incorrect Location, Stretched or Taught

1 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding to the next step.

2 . If the cause is not visually evident, check for Diagnostic Trouble Codes (DTCs) and refer to the DTC

Index.

Symptom Chart

Symptom

Possible source

Action

Rear blower motor is

inoperative / does not

operate correctly

•

Rear blower motor
circuits

•

Rear blower motor

•

Rear blower motor
control module

•

Auxiliary climate
control module

For rear blower motor and control

module tests, GO to Pinpoint Test

G426404p9.

Auxiliary climate control is

inoperative / does not

operate correctly

•

Auxiliary climate
control module circuits

•

Auxiliary climate

For auxiliary climate control circuit

checks, GO to Pinpoint Test

G426404p10.

control module

DTC Index

Auxiliary Control Module

CAUTION: When probing connectors to take measurements in the course of the pinpoint

tests, use the adaptor kit, part number 3548-1358-00

NOTE:

If the control module/component is suspect and the vehicle remains under manufacturer

warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if

any prior approval program is in operation, prior to the installation of a new

module/component.

NOTE:

When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to

three decimal places and with a current calibration certificate. When testing resistance, always

take the resistance of the DMM leads into account.

NOTE:

Check and rectify basic faults before beginning diagnostic routines that involve pinpoint tests.

NOTE:

Inspect connectors for signs of water ingress, and pins for damage and/or corrosion.

NOTE:

If DTCs are recorded and, after performing the pinpoint tests, a fault is not present, an

intermittent concern may be the cause. Always check for loose connections and corroded

terminals.

DTC

Description

Possible Source

Action

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