2010 JAGUAR XFR spare tire location

7 Initiators 8 TPMS module 9 Instrument cluster


Tire Pressure Monitoring System (TPMS) System Operation

The controlling software for the Tire Pressure Monitoring System (TPMS) is located within a Tire Pressure Monitoring System
Module. The software detects the following:

When the tire pressure is below the recommended low pressure value - under inflated tire.
The location of the tire on the vehicle that is below the recommended pressure.
Malfunction warning.

The TPMS system comprises:

Tire pressure monitoring system module located below the right-hand front seat.
Tire pressure receiver located near the gear shifter within the floor console.
Two front initiators positioned forward of the wheels and behind the fender splash shields.
Two rear initiators positioned rearward of the wheels and assembled on dedicated brackets located behind the fender
splash shields.
Four sensors, each sensor is integral with a tire valve and located within the tire; the space saver spare wheel is not
fitted with a sensor.

The four initiators are hard wired to the TPMS module. The initiators transmit 125 KHz Low Frequency (LF) signals to the tire
pressure sensors which respond by modifying the mode status within the Radio Frequency (RF) transmission. The 315 or 433
MHz RF signals are detected by the tire pressure receiver which is connected directly to the TPMS module. The received RF
signals from the tire pressure sensors are passed to the TPMS module and contain identification, pressure, temperature and
acceleration information for each wheel and tire.

The TPMS module communicates with the instrument cluster via the medium speed CAN bus to provide the driver with
appropriate warnings. The TPMS module also indicates status or failure of the TPMS or components.

Tire Location and Identification

The TPMS can identify the position of the wheels on the vehicle and assign a received tire pressure sensor identification to a
specific position on the vehicle, for example front left, front right, rear left and rear right. This feature is required because of
the different pressure targets and threshold that could exist between the front and rear tires.

The wheel location is performed automatically by the TPMS module using an 'auto-location' function. This function is fully
automatic and requires no input from the driver. The TPMS module automatically re-learns the position of the wheels on the
vehicle if the tire pressure sensors are replaced or the wheel positions on the vehicle are changed.
The TPMS software can automatically detect, under all operating conditions, the following:
one or more new tire pressure sensors have been fitted
one or more tire pressure sensors have stopped transmitting
TPMS module can reject identifications from tire pressure sensors which do not belong to the vehicle
two 'running' wheels on the vehicle have changed positions.

If a new tire pressure sensor is fitted on any 'running' wheel, the module can learn the new sensor identification automatically
through the tire learn and location process.

The tire-learn and location process is ready to commence when the vehicle has been stationary or traveling at less than 12
mph (20 km/h) for 15 minutes. This is known as 'parking mode'. The learn/locate process requires the vehicle to be driven at
speeds of more than 12 mph (20 km/h) for 15 minutes. If the vehicle speed reduces to below 12 mph (20 km/h), the learn
process timer is suspended until the vehicle speed increases to more than 12 mph (20 km/h), after which time the timer is
resumed. If the vehicle speed remains below 12 mph (20 km/h) for more than 15 minutes, the timer is set to zero and process
starts again.

Low Pressure Monitoring

The tire low pressure sensor transmits by RF (315 MHz or 433 MHz depending on market) signal. These signals contain data
which corresponds to tire low pressure sensor identification, tire pressure, tire temperature, acceleration and tire low pressure
sensor mode.

Each time the vehicle is driven, the tire pressure monitoring system module activates each LF antenna in turn. The
corresponding tire low pressure sensor detects the LF signal and responds by modifying the mode status within the RF
transmission.

The system enters 'parking mode' after the vehicle speed has been less than 20 km/h (12.5 miles/h) for 12 minutes. In parking
mode the tire low pressure sensors transmit a coded signal to the tire pressure monitoring system module once every 13
hours. If the tire pressure decreases by more than 0.06 bar (1 lbf/in²) the tire low pressure sensor will transmit more often as
pressure is lost.

As each wheel responds to the LF signal from the tire pressure monitoring system module, it is assigned a position on the
vehicle and is monitored for the remainder of that drive cycle in that position.

Message Other Warnings Reason Action APPLY FOOT AND
PARK BRAKE Amber warning triangle
illuminated in LCD. The battery has been disconnected or
power supply interrupted to the parking
brake module. Apply foot brake and parking brake to
reset the parking brake module. CANNOT APPLY
PARK BRAKE
Brake warning
indicator flashing.
Red warning triangle
illuminated in LCD. NOTE: In certain
markets the brake
warning indicator
does not flash. A fault is present in the parking brake
system and the parking brake cannot be
applied. A fault has occurred in the parking
brake system. Interrogate the parking
brake module for faults and diagnose
using an approved Jaguar Diagnostic
System. CHECK TYRE
PRESSURE
Tire Pressure
Monitoring System
(TPMS) warning
indicator
illuminated.
Vehicle graphic
displaying tire
location. A tire pressure has decreased to below
the warning threshold. Check tires for punctures and re-inflate
to correct pressures. TYRE NOT
MONITORED
Tire Pressure
Monitoring System
(TPMS) warning
indicator
illuminated.
Vehicle graphic
displaying tire
location.
One or more tire pressure
sensors have developed a fault.
A temporary spare wheel or a
wheel without a sensor has been
fitted at the displayed position.
An unapproved accessory may be
interfering with the TPMS.
Check for local RF interference.
A wheel has been fitted without
a TPMS sensor fitted (space
saver spare wheel).
TPMS sensor has developed a
fault or the battery voltage is
low.
A fault has occurred in the
TPMS. Interrogate the TPMS
module for faults and diagnose
using an approved Jaguar
Diagnostic System. CHECK ALL TYRE
PRESSURES
Tire Pressure
Monitoring System
(TPMS) warning
indicator
illuminated.
Amber warning
triangle illuminated
in LCD. Vehicle graphic
displaying tire
location. One or more tire pressures have
decreased to below the warning
threshold.
Check tires for punctures and
re-inflate to correct pressures.
Message may be displayed
when TPMS is learning position
of a new sensor. TYRE PRESSURE
SYSTEM FAULT
Tire Pressure
Monitoring System
(TPMS) warning
indicator
illuminated.
Amber warning
triangle illuminated
in LCD.
Wheels and tires without sensors
have been fitted to the vehicle.
TPMS sensors have become
defective.
An unapproved accessory may be
interfering with the TPMS.
A fault is present in the TPMS
system and the tire pressures
cannot be monitored. A fault has occurred in the TPMS.
Interrogate the TPMS module for faults
and diagnose using an approved Jaguar
Diagnostic System. TYRE PRESSURE
LOW FOR SPEED
Tire Pressure
Monitoring System
(TPMS) warning
indicator
illuminated.
Amber warning
triangle illuminated
in LCD. TPMS has detected current tire
pressures are too low for sustained high
speed driving Check tire pressures and inflate to the
correct pressures if necessary. TYRE PRESSURE
SYSTEM FAULT
Tire Pressure
Monitoring System
(TPMS) warning
indicator
illuminated.
Amber warning
triangle illuminated
Wheels and tires without sensors
have been fitted to the vehicle.
TPMS sensors have become
defective.
An unapproved accessory may be
interfering with the TPMS.
A fault is present in the TPMS A fault has occurred in the TPMS.
Interrogate the TPMS module for faults
and diagnose using an approved Jaguar
Diagnostic System.