It was the only "permanent" code issue; others were intermittent.

As an aside, I ran my voltmeter on the battery and found it to be ~12.4 volts at rest, low of 11.3 on starting and 14.4 or so on running. Battery dated 2018.

Now, for my real issue ... my display for the audio/climate control flickers/cycle on/off. My bluetooth worked after one super full battery charge but never again. Am thinking of charging it up again and seeing if that works.

Now, if my main head unit is going bad...I may upgrade to a Tesla-style tablet.

Any thoughts or feedback are appreciated.

 

You are missing a very big, important, obvious piece of information here...

 

I am a little slow on the electronics aspect of troubleshooting...but taking a shot in the dark, here is the code: U0197-00 (Lost communication with with telephone control module; Status: Permanent.)

Just tested battery immediately after removing it from an overnight, 10amp max charge (charger automatically adjusts downward as charge takes). 13.83 volts immediately post charger removal, 13.63 within 2 minutes of removal; all done while battery disconnected from car.

Otherwise, car is a 2012 XK (NA), S/N B4718X. Bluetooth model is latest (from my understanding) and has the "F" designation, not the "D" after numbers 10. I do not keep it the car on a trickle-charge as I drive it nearly every day.

 

Loop your BT unit Fiber Optics out of the system to see if you get your screen back. Go cheap here first.

This will work

Confirm you BT module is causing the problem by removing it from the MOST loop.
Then consider your options. Also, I would check ground and power from the head unit

The Tesla style units are, imnsho, a good look but are not a "replacement" as much as they are an alternative. They will do things your 9 year old car can't but they also don't have every OEM function. but first things first..... bypassing the BT may bring your head unit back to life and it's $15 and an easy DIY job to test.

 

Just ordered it on Amazon. Will test it tomorrow and run a load test on the battery.

One other fact I should have mentioned...I hear a scratchy sound every so often from the speakers. Leads me to think I have a short somewhere. Not sure that is connected to the Bluetooth but it could be to the head unit.

 

So, long time since this was written but have the same issue. I do not however know where to connect the proposed Fiber optics loop. Can you pls support with this? And also if this does not work do think a change to modern flatscreen would work? ( I realise that no guarantees can be given)

Comments pls from an old thread. Br Carl

 

please be more specific. The OP identifies two problems. What is your specific issue?

 

The central screen “rolls” starts with Jaguar goers black and then does this over and over, did take the fuse out to see if a period of 0 power would help. This did not help, thus the search for more answers so my Q remains with two potential solutions one inexpensive one and one reasonably expensive… . Would love to solve this with out making large changes

 

OK makes sense. Start with buying the bypass loop in the link above. What you're describing is common when a module in the fiber optic loop fails. You have a stack in the trunk. Usually has some or all of the following:

BT module
Satelite Radio module
Navigation module

These are all in a stack to the right of the battery. If you have an iPod module installed, that is in the right rear near the tail light.

The process of checking is easy. One at a time, disconnect a module by pulling the fiber optic line out and plug the bypass loop into the line, leaving the module plugged in. Then check your screen. If it stops, you've found the offending module.

The next stack is in the center console, behind and below (and including) the touch screen. Same process one at a time.
Those are:
Integrated audio module (black module on top of the CD player)
Information and Entertainment Module (CD player)
Touch Screen

Then if you have premium entertainment in your car, you have an AMP. THat's located under the carpet in the passenger footwell.

Example - disconnect the FO cable from the BT module and connect the bypass loop to the fiber optic line. Leave the module plugged in. Chack you screen. If the flashing stopped, the BT module is the problem. Replace it. In the example, the phone screen will be grayed out because you removed it from the loop during your test.

 

OK and thanks.

As a novise, are there any pictures that could help me? This would be very helpful….

 

Download the workshop manual. There should be some illustrations in it.
https://www.jaguarforums.com/forum/x...guides-215509/

Here are a couple:

Not all of these apply to your problem. This pic is of a RH car so in your case, AMP is on the right not left. 1,2,6,8,9,10 are all in the fiber optic loop.




HEre is the back side of the Center console. IP059, IP065 and IP088 are the three Fiber optic connectors there.

 

Superb!!! Thanks! If its not for me its for the the good mechanic :-)