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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