1998 JAGUAR X308 wiring

R
EPAIR the high resistance circui
t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No GO to F10
.
F10: CHECK
THE BRAKE CANCEL SWITCH TO CRUISE CO
NTROL SWITCH TO ECM CIRCUIT FOR SHORT TO HIGH
VOLTAGE
R
econnect the battery negative terminal.
1
Turn the ignition swi

tch to the ON
position.
2
M
easure the voltage between AC24, pin 03 (WU) and GROUND.
3
Is th

e voltage greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to F11
.
F11: CHECK
THE BRAKE CANCEL SWITCH TO CRUISE
CONTROL SWITCH TO ECM CIRCUIT FOR SHORT TO
GROUND
Turn the ignition swi
tch to the
OFF position.
1
Meas
ure the resistance between AC24, pin 03 (WU) and GROUND.
2
Is

the resistance less than 10,000 ohms?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to F12
.
F12: CHECK
THE BRAKE CANCEL SWITCH
IGNITION SWITCHED POWER SUPPLY
Turn the ignition swi
tch to the ON
position.
1
M
easure the voltage between AC24, pin 03 (WU) and GROUND.
2
Is th

e voltage less than 10 volts?
Yes REPAIR the circuit between the brake cancel sw itch and the ignition switch. For additional
information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.
No GO to F13
.
F13: CHECK
THE BRAKE CA
NCEL SWITCH OPERATION
Me
asure the resistance between AC24, pins 02 and 03.
1
O

perate the brake pedal up and down.
2
Doe

s the resistance switch between open circuit and continuity as the pedal is operated?
Yes Recheck the DTCs. Failure of other cruise contro l circuits will set other DTCs, indicating the
component at fault.
No INSTALL a new brake cancel switch. CLEAR the DT C. TEST the system for normal operation.

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.

Horn - Horn
Diagnosis and Testing
Tests Using the Portable Diagnostic Unit
Refer to PDU User Guide
The complexity of the electronics involved with the various Electronic Control Modules and the multiplexed communication
networks, preclude the use of workshop general electrical test equipment. Therefore, reference should be made to the PDU
User Guide for detailed instructions on test ing the horn circuit.
The PDU systematically tests an d analyses all functions of the horn, the horn relay, the bo dy processor module and the
operating switch.
Where a fault involving the horn, relay or switch is indicate d by the PDU, before replacing the component, some basic
diagnostic methods may be necessary to confirm that co nnections are good and that wiring is not damaged.

Clock - Clock
Diagnosis and Testing
Tests Using the Portable Diagnostic Unit
Refer to PDU User Guide
The complexity of the electronics involved with the various Electronic Control Modules and the two multiplexed
communication networks, preclude the use of workshop general electrical test equipment. Therefore, reference should be
made to the PDU User Guide for detailed in structions on testing the clock circuit.
The PDU systematically tests an d analyses the clock and the electrucal connections to it.
Where a fault involving the clock is indicated by the PDU, befo re replacing the clock, some basic diagnostic methods may be
necessary to confirm that connections are good and that wiring is not damaged.

Information and Message Center - Information and Message Center
Diagnosis and Testing
Tests Using the Portable Diagnostic Unit
Refer to PDU User Guide
The complexity of the electronics involved with the speedomete r and instrument cluster, of which the Message Center is a
part, and the two multiplexed communication networks which ar e connected to it preclude the use of workshop general
electrical test equipment. Therefore, refe rence should be made to the PDU User Guide for detailed instructions on testing
the speedometer and odometer.
The PDU systematically te sts and analyses all functions and the various systems affected by it.
Where a fault is indicated, before replac ing a component, some basic diagnostic methods may be necessary to confirm that
connections are good and that wiring is not damaged.

Parking Aid - Parking Aid
Diagnosis and Testing
Inspection and Verification
1.1. Verify the customer concern.
2. 2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
3. 3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. 4. If the cause is not visually evident, verify the sympto m and refer to the Jaguar approved diagnostic system.


Electrical
Fuse(s) Relay(s) Wiring Harness Electrical connector(s) Rear parking aid sensor(s) Rear parking aid speaker Reversing lamp switch Parking aid module

Battery, Mounting and Cables - Battery and Cables Description and Operation
The battery has been designed specifically for Jaguar. It provides the high output which is required for this vehicle, but with a
substantial saving in weight. It is a low maintenance battery, located on the right ha nd side of the luggage compartment floor.
The negative (Ground) lead is connected to the vehicle body. The positive lead is connected to a high power protection module; from
here power is connected to the starter motor an d distributed to other systems on the vehicle.
The high power protection module comprises three fuses, each of 250A capacity. Two fuses are connected in parallel to provide
protection for the starter circuit. Th e third one provides high level protection for fusebox supply circuits .
PDU is unable to diagnose the overall condition of the battery - only that it is present and supplying battery voltage to the system.
To test the battery, follow the test procedure described in Section 414-02 Generator and Regulator of this Manual.
Although these tests will not actually test the battery, they will confirm that the generator, regulator and connecting cables are
working correctly and that conseq uently, the battery may be at fault. Alternatively, the tests may indicate that the fault lies in the
generator, regulator or wiring and not in the battery.
Battery

Parts List


ItemPart NumberDescription
1—Battery
2—Positive Lead
3—Battery Hold-Down Clamp
4—Negative (Ground) Lead
5—High Power Protection Module (Fuses)

Generator and Regulator - Generator
Diagnosis and Testing
Refer to PDU User Guide
Refer to the PDU User Manual for detailed instructions on testing the charging circuit.
When diagnosing the charging ci rcuit, the PDU indicates only whether the generator is charging or not charging. The reason
for this is that the PDU cannot handle the potential full charging current and that the voltage control circuits are located
within the generator assembly, making th em inaccessible by the PDU directly.
It is possible that the battery has failed. In this case, the voltage output at the generator could be correct, but the voltage
at the battery terminals, and therefore the rest of the vehicl e system, will be adversely affected by the faulty battery.
The same result is given by the PDU if the battery is faulty (generator not faulty), wiring fault (damaged or severe corrosion
at the terminals) or if th e generator is at fault.
Inspection and Verification
The following manual tests help to pinpoint which component is at fault.
Testing the Battery Circuit
Using the Vehicle Battery

Remove the battery cover.
Ensure that all electrical loads are swit ched OFF and that the engine is cool.
Start the engine and allow to IDLE.
Whilst the engine is idling, disconnect the battery negative terminal and, using a digital multimeter (DMM), measure the
voltage between the terminal on the batter y negative cable and the battery positive terminal. If the generator is working,
the measured voltage should be within the range 13V to 15V.
This indicates the system voltage without the battery in circuit. If the generator is inoperative, the engine will stall when t he
ground lead is disconnected.
Repeat the test, using the ground bolt, as indicated (shown dotted on the illustration). There should be hardly any
MechanicalElectrical
Visually check the condition of the drive beltConnections on the rear face of the generator
are fully located?
Check that the belt we ar indicator, located on the automatic belt
tensioner, is within the limit marks