Jaguar XJ (X350). Manual — part 1244

Description and operation

Control Components

Item

Part

Number

Description

1

—

Instrument Cluster (IC)

2

—

Climate control assembly

3

—

Climate control assembly (vehicles with navigation)

4

—

Cold air bypass blend door actuator

5

—

Recirculation blend door actuator

6

—

Engine Control Module (ECM)

7

—

Blower motor

8

—

Auxillary coolant flow pump (Not fitted to 3.0L engine with 2 zone climate

control)

9

—

Footwell vent/duct blend door actuator

10

—

Defrost vent/register blend door actuator

11

—

Remote Climate Control Module (RCCM).

Item

Part Number

Description

1

—

In-vehicle temperature and humidity sensor

2

—

Air discharge temperature sensor RH

3

—

Air discharge temperature sensor LH

4

—

Sunload sensor

5

—

Ambient air temperature sensor

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6

—

Evaporator temperature sensor

The climate control assembly is a single module packaged in the instrument panel consol of the

vehicle. It is a microprocessor-based control consisting of a bezel assembly (including all buttons and

switches), a main control board and a housing for the unit.

The climate control assembly provides the following driver interface controls:

•

Climate control assembly ON/OFF switch/fan speed switch

•

Manual temperature adjustment switches (drivers/passengers)

•

DUAL temperature selection switch

•

DEFROST switch

•

Heated front screen ON/OFF switch

•

Heated rear screen ON/OFF switch

•

Manual air distribution MODE switch

•

Fahrenheit/Centigrade option switch

•

AUTO mode switch

•

A/C selection switch

•

Recirculate air switch

Operating any of the climate control assembly controls activates a chime (emitted from the

instrument cluster).

The climate control assembly automatically maintains a selected temperature for the interior of the

vehicle. The system regulates the volume of airflow between the instrument panel registers, floor

console registers, front and rear floor ducts, windshield defroster and side window registers. The

system can automatically select between fresh and recirculated air with an optional manual override.

The climate control assembly will try to provide both driver and passenger with their selected

temperature for comfort. The fan controls and air distribution are not controlled individually.

Blower Motor Control

The climate control system has a variable blower speed control. The operator has the option of

manually selecting one of eleven preset blower speeds from the control panel (seven preset blower

speeds with telematics fitted) or selecting to operate the climate control assembly in automatic

mode.

In automatic mode, the blower speed is determined as a function of many input variables. Based on

the desired in-vehicle temperature, the system constantly monitors the ambient temperature,

discharge air temperatures, in-vehicle temperature and sunload levels then calculates the desired

blower setting.

There are special conditions that affect the blower speed while in the automatic mode of operation.

In a cold ambient temperature condition, the climate control assembly implements a Cold Engine

Lock Out (CELO) feature with the blower motor. For a cold vehicle interior, the climate control

assembly will operate in low blower/defrost mode until the engine coolant temperature reaches a

required value. Once the engine coolant has warmed up the blower motor will continue in the

automatic mode.

At increasing vehicle speeds, monitored via the Standard Corporate Protocol (SCP) vehicle speed

status message, the climate control assembly system may adjust the blower motor speed to maintain

constant air flow. This may be necessary in situations where the ram air effect at high speed alters

the air flow into the vehicle interior.

For vehicles fitted with a cellular phone, the climate control assembly may lower the blower motor

speed to reduce the level of ambient noise in the vehicle interior when the phone is in use. The

status of the cellular phone is monitored via the SCP cellular phone ON/OFF message.

Air Distribution Control

The climate control system has variable position control provided by the electrical actuators. The

system gives the option of manually selecting one of five preset air distribution modes or operating

the climate control assembly in automatic mode.

Climate Control - Battery Disconnection

The climate control assembly will store the panel settings in volatile memory. Therefore, in the event

of battery disconnection, or interruption of the supply, the information is lost. After reconnection,

historical fault codes are available, and the panel will be set to OFF. An average automatic setting will

be recovered when the climate control assembly is next switched ON.

If the battery is disconnected, the panel settings will be lost. The customers personal settings should

be recorded and re-set before the vehicle is returned to the customer.

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