Well, finally got the top to go up and down and rear quarter windows to go up. Also have trouble shot my starting issues to a crudded up start/stop switch with a new one on order, ouch is the price tag.
Next in line is TPMS, flashing sign states a problem with the two rear so I figured bad sensors, incorrectly, as they are sending out a signal with a reading that matches the analog gauge, scan the system at OBD port and they are all reporting high pressure, so obviously the signal is getting to the system. Is there a separate control box, or where should I go next?

 

Start at the Workshop Manual in the sticky at the top of this Forum. Download the 4.2L version and find the TPMS section for troubleshooting advice.
https://www.jaguarforums.com/forum/x...guides-215509/

 

I think I saw a start switch in the forum marketplace.

 

I replaced every component of the TPMS in my XKR. I chased all the wires. I reflashed the Module and receiver. Several times.

I still get a TPMS fail.

I'm about ready to disable it altogether.

 

TPMS

1. does it work? - YES
2. do I need it? - NO

I must say in defence of the system that mine is (so far) reliable. I have a very slow leak on the NSF and it pops up a warning when the pressure drops by 5 psi. I only did this as an experiment because I check tyre pressures every time the car is washed so they never normally drop more than 1 to 2 psi. I can tell just by looking long before a tyre drops 5 psi that it needs inflating and I'm sure most of you will be the same so the TPMS is an unnecessary complication.

TPMS is mandated by European Construction & Use Regulations which is why our Jaguars have it fitted but I wouldn't hesitate to disable it if it gave trouble.

Graham

 

I truly detest the TPMS system on all cars as they are nothing but trouble and useless for those of us who tend to handle our own maintenance issues. That said if anyone know the proper way to delete the system without throwing codes on a daily basis, please fill me in via PM, don’t want to start a “safety” war on the forum.

 

Sharing a data point.
After years of struggling with clockwork TPMS error when temperature fluctuated wildly, or onset of winter. Filled the tires with nitrogen and havent had error this season.

 

TPMS is worth its weight in gold because it alerts you in time to stop and not ruin your low-profile tire and chew up your rim. Always carry a 12 volt tire inflator in your trunk so you can (hopefully) fill up that tire and get to a tire shop to repair or replace it.

And then there are those of us whose X150 came from the factory without a spare tire! Don't despair. See:
https://www.jaguarforums.com/forum/x...-brakes-67260/

 

Except for some of us, it's so unreliable and unpredictable we just end up ignoring it. I've stopped many a time to check pressure on a tire when the damn thing shot off an alarm only to find out it's at 33psi!

 

The OBD II port? The TPMS system doesn't transmit to the OBDII port. Please clarify.

You need the manual to properly service the TPMS system.

http://www.mediafire.com/?2ssiyne7ma1fs

 

My tire guy was able to get into the system via OBD ll and view what the controller sees, 56 psi more or less all four tires. He also used his scan tool for each tire sensor and all were at 37 psi more or less, which is high. So yes than see see what the car is interpreting, but is obviously incorrect. I do not know if the controller is set to alert of a perceived over pressure, doubtful, or if the installed sensors are generic but I figure Jaguar sensors are the second place to look after I check for frayed wires. Either way, I’m not going to dump a lot of money into it as I can look around that silly warning, but would like disable.

 

OK must be reading something from a canbus pinout in the port. Either way you need the DTC codes to properly diagnose so on the cheap end, something line a iCarsoft LRII. Anything else is guessing and swapping parts. I'd say time to replace the sensors but that assumes they are OEM and we don't know that and as you say, they are sending signals and showing active.
A simple test is to just overinflated the tires to 40PSI and drive over 50 MPH for 15 minutes. Sometimes that solves the problem, especially if it posts up around change of seasons. Also I'm of the opinion ion that some OBD!! BT dongles or other BT devices will trip the TPMS system. If you have one in to OBD port for Torque Pro or another app , or other BT device, consider disabling it for a few hours and see if the warnings go out.

 

+1

 

I had all my TPMS senders replaced last year after one starting getting dicey. Now, every time I go out, I get the TPMS alarm. I go back to the tire dealer and they verify the modules are sending. They plug their monitor int to OBD port and do a reset and a couple miles later the alarm goes away until the next time I go out. If I could kill the system, I most assuredly would.

 

They were at 36 psi each, took it too my hangar dropped them to 10 and refilled per the door jamb with nitrogen, maybe that will do something but I doubt. Nothing in the OBD port as she is bone stock. Think I will ask my independent guy to just disable the silly thing, never hurts to ask.

 

I am completely confused as to 'why' many are having issues with TPMS. Works great in all my vehicles. On fact on a very long drive (On my way to NYC) alerted me to a slow leak due to a puncture. (Yes, I keep a low pressure 12 v pump in the boot)
Yes, my xkr is older but I always replace the tpms sensor whenever I change up the tires.
And don't fall for the nonsense that they need to be 'coded'... provided they are on the right frequency they will adjust appropriately all on there own.
Lastly, you may find much better handling if you do not over inflate your tires. For my driving preferences/techniques I actually prefer under inflating by 2 lbs, cold with my MaxPerformance Summer tires. However with my Winter/snow tires, inflation to the specified value. Summers are low profile, winters are not. And yes, nitrogen is the answer for many reasons.

 

He won't and can't disable it. Federal law. You need to find someone with SDD who is willing to do it. I've turned mine off and on but like Cee Jay, it ultimately keeps tripping. I had some success with a wifi dongle not tripping the system but the damn thing kept connecting to my home network. I think I have it disabled now, don't recall. I check the air frequently anyway, more for balance of tire pressure than worrying about one tire getting too low.

 

Have to drive the car one hand behind your back whilst crossing your toes and wink and every second person then hopefully it might reset itself ... Stuff that get a dealer or someone with SDD to switch the TPMS off #save your sanity

 

Mine only triggered once in 20K miles and that was for a leak in my left rear tire. I also bought a TPMS tester which reads each sensor and has the ability to reset the module through the OBDII port. Considering all cars have sensors it was easier to have my own tester then go to a tire place to get a reading. Also at 8 years I started to have battery failures on my Lexus and with that system I needed to read in the new sensors into the TPMS module after replacing them.

 

TPMS is officially dead to me, on to the next issue, which I will start another thread for.