I guess after year and a half I would finally get hit with Jaguar weirdness.
I will be driving along and infotainement system will turn off,, a few seocnds later boots back up,,I get music for couple seconds
then turns back off ,, rinse repeat,, cant stop it,,cant turn it off,,all I can do is turn volume down in the brief time it is working so it doest drive me batshit crazy and in 15-20 minutes it will go back to working normally.. Only does it after I am driving around for a while so IT IS NOT THE BATTERY for all the people that are itching to respond saying it is the battery, LOL

Ideas?

 

Start simple: check the fuse in case it's flaky. Does it only happen when you're moving? If so, a flaky connection is possible in the electrical supply path, since it seems to shut off and then on.

OK, that done, read the Jaguar codes for the entertainment system. (buy your own code reader. I use Autel HT for $60-80, including the JLR download. Must read JLR codes!)

That should get you better guidance. The 5.0 maintenance manual, in the sticky's, has a complete list.

It could be the head unit or the amp unit (depending on what you have installed).

The entertainment system codes are pretty good. But without them, you're guessing.

I suppose you can pull the head unit (pretty easy) and reseat all the connectors after spraying the metal ones with electronic contact cleaner. Same thing on the amp, if you have a separate one.

 

I have the Icarsoft scanner for JLR ,,only happens when driving ,,
If you stop somewhere for 10-15min it will be fine when you come back.
Ill run codes when I get a minute off work. Been very busy and forget until I get back in car

 

Some people say that if there is anything plugged into the OBD2 connector they have problems somewhere.
It's an easy thing to check.

 

And I went through this many years ago. the nut on the grounding terminal in the passenger footwell had loosened.

 

Well, in my case replacing the battery did the trick.
I was an hour into an 8 hour drive when mine started rebooting. It was a hot day, aircon was on and traffic was slow, wife was charging her phone via the cigar lighter jack.
Maybe it was the fault of the alternator not keeping up, as the voltage reading was low, but since replacing the battery I haven’t had a repeat event.

 

Too true kj07xk, All of us with the experience know… eliminate the easiest culprit first. Properly check the battery. And as they are starting to show their age, the alternator.
What was dumbfounding us in my case… there were no codes. How could there be, there was no circuit. Finding that loose nut was 2 hours of troubleshooting.

 

I have had the same problem over the last couple of months on my car. I have traced it to my bluetooth module not functioning properly. On the module next to the battery in the trunk on the right there are three connections into the module. The right hand plug and the middle plug are rectangular plug ins while the left hand plug in is a round pin type plug. If you unplug that pin you'll see that you have no screen at all and that plug has a plastic wrap that keeps it tightly attached. It is very brittle, and mine cracked the first time I removed the module. So it doesn't always stay well connected. If I unplug and then replug, I have usually been good until the next time it partially disengages. I am waiting for a new module today because I also find that if I try and pair my phone by pressing the search button on the screen, the on and off will soon follow as well. Have you had any issues with your phone's bluetooth connection?

 

Good possibility.

Htrd: download the appropriate electrical diagram from the Sticky. Look at the section called ground distribution. Find the ground distribution point for the touchscreen. On my '06 coupe, it's G28BL1, listed as being "beneath front console", but is highlighted in the image attached. Looks like it's near/under the ashtray. Also looks like both the ground for the touchscreen and the head unit are in the same place.

The attached is for VIN>20075, but the wiring harnesses don't change much.
Note that these images are searchable PDF's, so if you do a "find" on a connector number, it'll pop right up with a highlight.

 

Thanks everyone, I will definately go thru your helpful suggestions..
I did went thru every module using the I-carsoft and had zero codes,
I have a volt meter in my car and it has never gone under 13.6V so not battery..
next will be doing as Guy,Panthera and Tberg suggested.
Unfortunately my next day off isnt for two weeks but as of right now radio has setlled and is not turning off and on.
Typical Jaguar weirdness,,they just really did not build a well thought out electrical system at all.

 

Glad there’s a mysterious fix in play for you.
For your information, I think you may find the 13.6 v you have read is the charging voltage when the car is running.
It indicates nothing on the health of the battery. But does indicate your alternator is working as expected.
Cheers

 

Well since the only time it has done it is after driving for a while (30 minutes or longer) so fairly confident the health of the battery
has nothing to do with it either seeing as alternator is giving full charge while driving...

 

stopped doing it all on its own without me changing anything,,

 

Codes?

 

Quote: "Thanks everyone, I will definately go thru your helpful suggestions..
I did went thru every module using the I-carsoft and had zero codes,
I have a volt meter in my car and it has never gone under 13.6V so not battery.."

 

The voltage when the engine is running isn't the issue, it is how much juice the battery has when you turn on and start the car. If the voltage is a little low various modules can glitch and play up until the car has been shutdown for 30 minutes or more.

This is how long the touch screen on my 4.2 XKR used to stay on the leaper on engine startup when the voltage was low:


And this is when the battery was properly charged. The touch screen goes straight to the home screen as soon as the engine starts. When the battery voltage is low it took around 10 seconds and if it was very low the leaper would just stay on the screen and stay there even after turning the ignition off:

 

1. as I stated repeatedly problem was only after driving around for awhile not when starting. If my voltage was that low while driving on the highway at 75mph I think I would have a lot more problems than the screen .
2. Problem went away and has not come back without me doing anything about it.

 

I know, I was just pointing out that quoting your voltage when the car is running isn't really relevant to the module glitch issue (unless it is low of course!).

I used to get all sorts of weird and wonderful issues with my 4.2 when the battery was low including the car suddenly deciding it was running over temperature, the parking system disabling itself, passenger collision sensors thinking they were faulty, etc.

Good news that it has gone away although I hate those sorts of problems.

 

A fuse probably.Either that or a shortage in it somewhere.I couldn't give you any other clues since i never experienced something like this happening

 

again thank you all for your suggestions,problem went away on its own,
been almost 2 months and couple thousand miles since it did it..
Just chalk another one up to Jaguar weirdness..