Jaguar XJ (X350). Manual — part 90

indicator will flash for 72 seconds after the 3 second bulb check period and then remain permanently

illuminated.

If a tire pressure warning message is detected by the instrument cluster at ignition on, the warning

indicator will extinguish briefly after the 3 second bulb check period, before re-illuminating to

indicate a tire pressure warning.

The following table shows the warning indicator functionality for given events:

Message

Reason

Action

CHECK

PRESSURE RH

FRONT TYRE

RH (right-hand) front tire pressure has

fallen to 25% of recommended pressure.

Stop the vehicle as soon as safely

possible. Check all tire pressures and

inflate to recommended pressure.

CHECK

PRESSURE LH

FRONT TYRE

LH (left-hand) front tire pressure has fallen

to 25% of recommended pressure.

Stop the vehicle as soon as safely

possible. Check all tire pressures and

inflate to recommended pressure.

CHECK

PRESSURE RH

REAR TYRE

RH (right-hand) rear tire pressure has fallen

to 25% of recommended pressure.

Stop the vehicle as soon as safely

possible. Check all tire pressures and

inflate to recommended pressure.

CHECK

PRESSURE LH

REAR TYRE

LH (left-hand) rear tire pressure has fallen

to 25% of recommended pressure.

Stop the vehicle as soon as safely

possible. Check all tire pressures and

inflate to recommended pressure.

TYRE PRESSURE

SENSOR FAULT

Pressure sensor failure, a wheel has been

fitted to the vehicle that does not contain a

pressure sensor, or interference from an

unapproved accessory.

A fault has occurred in the TPMS.

Interrogate the TPMS module for faults

and diagnose using the Jaguar

approved diagnostic system.

TYRE PRESSURE

SYSTEM FAULT

No transmission from more than one

pressure sensor, more than one pressure

sensor fault, or CAN (controller area

network) bus signal missing.

A fault has occurred in the TPMS.

Interrogate the TPMS module for faults

and diagnose using the Jaguar

approved diagnostic system.

TYRE

PRESSURES

LOW FOR

SPEED

Tire pressures are not suitable for high

speed driving.

Stop the vehicle as soon as safely

possible. Check all tire pressures and

inflate to recommended pressure.

A = Hardwired; D = High Speed CAN (controller area network) bus; F = RF Transmission; W = LF

Transmission

Item

Part Number

Description

1

Battery

2

Battery fuse box

CONTROL DIAGRAM

NOTE:

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3

Rear power distribution box

4

RF antenna

5

Spare wheel pressure sensor (if fitted)

6

LH (left-hand) rear pressure sensor

7

RH (right-hand) rear pressure sensor

8

LH (left-hand) front pressure sensor

9

RH (right-hand) front pressure sensor

10

RH (right-hand) front initiator

11

LH (left-hand) front initiator

12

RH (right-hand) rear initiator

13

LH (left-hand) rear initiator

14

High speed CAN (controller area network) bus to other vehicle systems

15

TPMS module

PRINCIPLES OF OPERATION

Each time the vehicle is driven the TPMS module activates each initiator in turn to transmit a LF 125

KHz signal to each tire pressure sensor. The LF signal is received by the tire pressure sensor which

responds by transmitting a signal which is received by the RF antenna. The signal contains coded data

which corresponds to sensor identification, air pressure, air temperature and acceleration data and is

passed to the TPMS module.

When the vehicle has been parked for more than 15 minutes and then driven at a speed of more

than 12.5 mph (20 km/h), the initiators fire in turn for 6 seconds on all 433 MHz vehicles or for 18

seconds on 315 MHz vehicles in the following order:

•

Front left

•

6 second pause (for the TPMS module to detect a response from the tire pressure sensor)

•

Front right

•

6 second pause

•

Rear right

•

6 second pause

•

Rear left

•

6 second pause.

Each tire pressure sensor responds in turn which allows the TPMS module to establish the sensor

positions at the start of the drive cycle. This process is repeated up to 3 times but less if the sensor

positions are already known. The process is known as 'Auto Location' and takes 2 to 4 minutes to

complete.

During this period the tire pressure sensors transmit at regular intervals, once every 5 seconds (once

every 15 seconds on 315 MHz vehicles). For the remainder of the drive cycle the tire pressure sensors

transmit once every 60 seconds or more often if a change of tire pressure is sensed until the vehicle

stops and the TPMS returns to the parking mode.

Once the wheel positions have been established, the initiators stop transmitting the LF signal and do

not transmit again until the vehicle has been parked for more than 15 minutes.

The TPMS enters 'Parking Mode' after the vehicle speed has been less than 20 km/h (12.5 mph) for

15 minutes. In parking mode the tire pressure sensors transmit a coded RF signal once every 13

hours. If the tire pressure decreases by more than 0.06 bar (1 lbf/in²), the sensor will transmit more

often if pressure in the tire is being lost.

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