After market Tire pressure sensor, TPMS learn mode/procedure question
 

Due to failure I need to replace the tire pressure sensor and I'm looking at this after market part:
Tire Pressure Monitoring (DORMAN Part # 974031 315 MHZ)

The failure sensor was on the rear passenger wheel. I have the following question.

How does the TPMS computer know which sensor belongs to which wheel ?
Is there a learn mode/procedure that should be followed after changing the sensor?

Any advise would be appreciated.

Each sensor has it's own radio ID code which is broadcast when the wheel is moving.The computer will automatically be able to ID any new sensor once the car is driven for a quarter mile or so.You do not need to do anything but drive the car to relearn the computer.

Useally alot more than a 1/4 mile:)
somewhere in the neighborhood of 11 miles give or take

EDIT: Drive car until light goes out lol.

TPMS almost makes sense
 

Ok.... This almost makes technical sense ... but How does the computer know which sensor belongs to which wheel. When I order the sensor there is no inquiry with respect to the wheel position or the id-code the sensor should transmit.

I understand that each sensor is transmitting it's unique code -- but how does the computer (better known as the software that runs on it) know to associate the specific code with the specific wheel location. I don't think the "sensor" can transmit it's position unless it's made aware of it somehow.

One way i see this could be achieved is if there is a receiver mounted in each wheel bay and the signal out of sensor is only strong enough to travel 30 centimeters or so.

I'm very curious how transmitted codes are linked to wheel locations.

There are special antenna's located at each corner of the car that read just the ID code of that wheel.

Spare tyre warning
 

A couple of days ago, I started getting a warning message every time I start my Jag (2006 XJ8 VDP). The message tells me that I have a tyre pressure problem on my spare!
After a few minutes, the warning message goes away.

I get it limelight

The special antennas are no so special, by virtue of being closest to the transmitter the antennas receive the closes signal; since there are 4 independent receivers -- simply by virtue of being, the software knows where each "unique code" is coming from since th "special" (partially directional) antenna(s) only receives the signal that is receivable in it's direction (sensitivity range); otherwise by virtue of missing signal the "computer" (s/w) detects nothing and reports a 'problem'.

Thanks for making this clear. I hope to have an actual look at the receiver circuitry some day.

Best regards to Brutal and limelight thanks for replying.

Best Regards.
-Chris

The antenna's are an oval shape with a small grid pattern. Yes the tire sensors have a very small broadcast range so that the other antennas don't pick it up.
GrafShutka:There is also a sensor in the spare.I would check and adjust the pressure in the spare tire.The warning will go away after some driving and not reappear.

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Does this sensor work for 2006 XJ8 L? Do I need to replace all 5?

Thanks
Mark

Yikes I know old thread, I have the 2011 XJL and just replaced the 2 rear Tpms today and after about 7 miles then parked home for the day I'm still getting all the warning idiot dash lights, do I just need to drive a lot more and will it relearn on its own hopefully soon?? Some people say a dealership has to do it for code reasons. I hope not!! Jaguar of course..

What MFG TPMS did you purchase? Many hear have not had good luck with Doorman, and cheap sensors. VDO is the oem sensor.

New in box Uni Sensor ITM aluminum valve... Obviously aftermarket but they should still work, Ive only put 7 miles on the car since install but some say drive 10-15 minutes over 15mph, hopefully I don't have to take this to the darn dealership and make a big production out of this..

Some aftermarket TPMS sensors have to be cloned, and only work half of the time. Let me guess, the tire shop said they would work. "Uni" sounds like universal, and may need to be cloned.
Seems like "universal" has never been in Jaguar's vocabulary.

Yes I know Jaguar I'm finding out can be annoyingly finicky with some things. I actually just saw these sensors on Ebay they had good write ups so I got 2 and I had a shop install the 2 rears only. What do you mean by cloned and how do I do that?. I'm taking the car back to the shop Monday to make doubly sure they are the 315Mhz or the 430Mhz. the ones he said I needed were the 315Mhz. If all else fails I guess i'll have to get the Oem ones way more expensive and hope for the best:icon_errrr:

The originals program themselves after a few miles.

You mean the Oem Tpm's? I'm thinking the aftermarket ones should do the same thing to.

Agreed, they should.

Not always. You don't necessarily have to get genuine from the dealer. Many have had good luck with VDO much cheaper, as they are the OEM manufacturer.

Not necessarily true, some aftermarket or Oem Tpm's for Jags have to be coded individually and married to the cars computer through a computer,, So I heard...