1998 JAGUAR X308 instrument cluster

other sensors. This feature prevents the effects of sudden changes in air outlet temperatures due to factors such as:
Recirculating air from the engine cooling pack at low vehicle speeds Sudden changes in ambient temperature The effects of water splash
Motorised In-car Aspirator.

An intake grille (mounted on the fascia , outboard of the steering column and below the EOD vent) houses the aspirator
thermister. The remotely mounted motor / fan assembly draws ca bin air through the grille and thus over the thermistor; a
flexible hose connects both components.
The electrical resistance of the thermistor changes in response to variations in air temperatur e, this change being converted
into an electrical signal. The A/CCM uses this signal to adjust the temperature, airflow and air distribution from the air
conditioning unit.
Coolant Temperature Signal.
This signal is supplied to the A/CCM from the instrument cluster, the input being required to:
Provide blower inhibit control , to avoid the system in heat ing mode delivering cold air when the coolant temperature is below 35°C unless DEFROST is selected. To progressively increase the fan speed up to maximum blower speed during warm up control. To assist in the control of the outlet temperature. To avoid possible pump or valve damage ca used by ice particles in the coolant.
Compressor ON Signal.
This signal monitors the compressor relay to confirm the compressor operating state and so provide relevant fault
information.
Servo Motor Control.
Flap position, which directs the flow of air through the system, is controlled by servo motors; these may be driven in either
a clockwise or anti-clockwise direction by signals from the A/ CCM. Motor, thus flap position, is monitored via a feedback
potentiometer which is situated within the motor housing.
Servo motors control the following flaps:

Instrument Cluster and Panel Illumination - Instrument Cluster and Panel
Illumination
Description and Operation
Details on the Instrument Cluster and Panel Illumination can be found in sections 413-01, 413-06, 413-07 and 413-08.

Instrument Cluster and Panel Illumination - Instrument Panel Dimmer
Switch
Removal and Installation
Removal
Installation

1.
Move driver seat fully rearward.
2. Disconnect battery ground lead; refer to 86.15.19.
3. Displace lower cowl for access; refer to 76.46.03.

4. Remove rheostat sw itch from cowl.
1. Disconnect dimmer module to rheostat switch connector.
2. Disconnect column tilt switch connector.
3. Remove lower cowl.
4. Pull adjusting knob from switch.
5. Remove screw.
6. Remove switch.
1. Installation is reverse of removal.
2. Reconnect battery ground lead; refer to 86.15.15.

Instrument Cluster - Instrument Cluster
Description and Operation
ItemDescription
1Variable Power Steering
2Coolant Level
3Fuel Level
4Oil Pressure
5Lamp Dimmer
6Driver's Switchpack
7Generator (Charge Warning Lamp)
8Catalyst Overheat
9Instrument Cluster
10Climate Control (Signal to Module)
11ICE Head Unit

The In
strument Cluster is the primary electronic control module for the speedomete
r, tachometer, coolant temperature, fuel
level, driver information (Message Centre) and warning lamps.
The Instrument Cluster also:
- provides input / output informatio n signals for use by other modules.
- acts as a protocol converter (software language translator - the languages used on each network are very similar, but
neither can be directly interp reted by the opposite system) for communication between all modules on both the CAN and
SCP multiplexed networks. The Instrument Cluster is the only module on the vehicle which communicates between the two
networks.
Instrument Cluster Gauges

*Not used on all markets. Refer to the Drivers Handbook.
Although the gauges look like conventional analogue gauges, each pointer is driven by a stepper motor to provide more
12Ai
rbag Circuit Integrity
13Adaptive Damping
14Body Processor

Module
It

em
De
scription
1Low Fu

el Level
2Exhaus

t System Temperature *
3E

ngine Coolant High Temperature
4Di

rection Indicator Right Hand
5Side

/ Parking Lamps
6Handbrake ON / Low
Bra
ke Fluid Level
7Main

Beam
8Ai

rbag / Airbag System Fault
9Hi

gh Priority Text
Message Displayed
10M
essage Centre (Text Messages)
11Low Pri

ority Text Message Displayed
12Se

at Belt Not Fa
stened (Driver's)
13ABS Integrity
14EMS Fault
15D
irection Indicator Left Hand


accu

rate readings.
Refer to Section 413-08 for details of the Driver Information / Message Center.

Instrument Cluster - Ins
trument Cluster
D
iagn
osis and Testing
Tests U
s
ing the Portable Diagnostic Unit
Re
fe
r to PDU User Guide
The c
o
mplexity of the electronics involved with the Instrument Cluster and the two multiplexed communication networks
which are connected to it, preclude the use of workshop genera l electrical test equipment. Therefore, reference should be
made to the PDU User Guide for detailed instructions on testing the Instrument Clus ter and associated circuits.
The PDU systematically test s and analyses all functions of the Instrument Clus ter, the various systems controlled by it and
individual sensors which are attached to each separate system.
Where a fault involving a remote sensor e. g. water temperature sensor, is indicated, before replacing the component, some
basic diagnostic methods may be necessary to confirm that connections are good and that wiring is not damaged.
Diagnostics using the PDU is via the CAN network, accessed at the diagnostic connector on the car.
Replaceable Parts
The only replaceable part s
are, General Illumination Bulbs, Direction Indicator Warning Bu
lbs and Main Beam Warning Bulb,
which are all of the conventional filament type. Other warning lamps are LEDs and are not replaceable.

Instrume
nt Cluster - Instrument Cluster
Re
moval and Installation
Remov

al
1.
Adjust steer
ing column to full
y extended and lowered position.
2. Remove battery cover and disc onnect ground cable from
battery terminal. Refer to 86.15.19.
3. Remove veneer from instrument panel. Refer to 76.47.24.

4. Using a small
screwdriver, de
press fog lamp switch upper
retaining tang and release sw itch from gauge surround.

5. Position fog l
amp switch fo
r access, disconnect harness
multiplug and remove switch.

6. Using a small
screwdriver, depress trip keyboard upper
retaining tang and release ke yboard from gauge surround.
7. Position trip keyboard for ac cess and disconnect harness
multiplug.

Information and Message Center - Information and Message Center
Description and Operation

The Driver's Information / Message Center has a liquid crystal display and is located at the lower area of the Major
Instrument Cluster.
The message center displays messages in text form for the driver, including odometer readings an d trip computer data. It
can also provide information normally covered by conventional wa rning lamps or typically indicate that a feature such as the
Automatic Stability Control is operating.
Located above the message center are two lamps, red for warning and amber for caution. When a message is displayed, the
appropriate lamp will illuminate to attract the driver's attention and to signify the importance of the message. The lamps
also illuminate simultaneously for some warnings and for some non-text warnin gs - refer to the Drivers Handbook for
variations in local markets.
Trip Computer

Pressing the trip switch on the left stalk of the steering colu mn switch assembly activates the trip computer which displays
trip data on the message center. Warning and Information messages have priority ov er trip data; if a driver information
message is displayed prior to activation of the trip computer , the trip data will appear for 10 seconds only, before being
ItemDescription
1Driver's Information / Message Center
2Amber Warning Lamp
3Red Warning Lamp
4Major Instrument Cluster
5Speedometer