Tuesday, July 22, 2014

Jaguar XK (2007 - 2009) Tire pressure monitoring system (TPMS)

Tire Pressure Monitoring System (2007 – 2009 XKs)

What is it for?

The Tire Pressure Monitoring System (TPMS system) is designed to aid the driver to keep the tires at the right pressure. This system is NOT designed to inform you of a BLOW-OUT, is designed to monitor gradual change in tire pressure, which would help prevent a blow-out. It is the driver’s responsibility to keep the tires in good shape and properly inflated.

What does it do?

The TPMS system detects if a tire is under inflated and informs the driver when the pressure falls below 25% of the nominal pressure. It also knows the position of each tire.

What and where are its components?

The system comprises of 4 sensors (one in each wheel, no sensor for the spare tire), 4 initiators (one by each wheel well), an RF receiver and a control module which are located behind the rear passenger seat.

How does it work?

The control module sends a signal to the four initiators by wire. The initiators send a 125 kHz signal to the sensors. The sensors send a 315 MHz or 433 MHz signal to the RF receiver. This signal has the identification, pressure, temperature and acceleration of each wheel. The RF receiver transmits this signal to the TPMS computer. The computer interprets this signals and sends the data to the instrument cluster via the CAN network.

Some useful information

  • The TPMS system automatically detects the position of the tires. If you rotate them there is no need for any procedure to relearn the positions. 
  •  If you fit a new sensor, the module can learn it automatically if the vehicle is standing still for 15 minutes and then driven for more than 15 minutes at more than 12.5 mph.
  • When the key is first turned on, the TPMS light comes on for 3 seconds as a bulb check.
  • There are four possible warnings in this system:
    • CHECK TYRE PRESSURE: means one tire is low 
    • CHECK ALL TYRE PRESSURES: means two or more tires are low
    • TYRE NOT MONITORED: means one specific sensor is not transmitting
    • TYRE PRESSURE SYSTEM FAULT: means two or more sensors are not transmitting, a CAN network fault or another TPMS fault.


  1. Does the tyre sensor require some sort of power, if battery where and how often do you have to change it

    1. It has an internal battery. You change it as they go bad :/ in my experience they last two or three times the life of the tire.

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  3. Can tires in my garage give my car a tire fault if all 8 tires are close together?

  4. Can tires in my garage give my car a tire fault if all 8 tires are close together?