Hi Guys,

I didn't pay much attention last winter when this happened but tonight - ambient temp 27 degrees

Start car, everything nominal, except for my navigation (factory) screen - it's blank. The buttons surrounding the nav are lit but have no functions.

Tonight was a short trip home, but reminiscing on when it happened last year it would take a good 10 - 20 minutes for the screen to illuminate and allow climate, nav functionality, etc.

Where should I start?

I'll check for codes tomorrow with SDD, but when it happened last year, there were no codes.

Again, only happened when ambient temp is below 32 degrees. ??♂

Thanks

 

I believe that the screen is illuminated by a flourescent tube about 4 mm diameter.
Tubes of that size are available but the root cause may be the starting voltage

https://www.jaguarforums.com/forum/x...noyance-79117/

 

Thanks.

Didn't even realize the screen back light was a CCFL... ugh!!!

Was going out to check associated fuses and started the Jag.

Screen and all controls back on today. (50 degrees now)

Battery about 1 year old. No screen issues, strobing, everything lit properly.

To your point.

I may throw the Jag on C-Tek when cold weather is coming and see if that makes a difference.

 

When those CCFL tubes get old, they can draw a higher start current which can prove to be too much for the small high voltage supply module that is present in the device to kick off.
The tubes get the same darkened age ring appear on the ends that their bigger florescent counterparts do.
Changed quite a few CCFL tubes on LCD monitors and laptop screens over the years.
You need to measure the diameter of the CCFL as they range in diameter as well as the correct length.
On one touring coach embedded dash display I did, it had a CCFL that had a 90 degree bend so it lit the LCD from two sides at the same time.

 

Following up on this...

Not much of a solution, except to find a used unit from an 2008 or 2009 MY XJ8 (I found one)

There's some buzz out there Jaguar switched to a different style bulb; 2006 or 2008 or might be with the face-lift XJ; who knows.

My unit works perfectly. If the ambient temperature is near or below freezing, the screen will not illuminate, which is dangeous as I have no HVAC controls.

Same with the rear HVAC unit; tied into the main unit.

Now, sometimes after 10 - 20 minutes of driving it will illuminate but can't chance it.

No repair facilities.

I could go the Jag Droid route but decided against it.

Once it arrives I'll be swapping the unit out. Hopefully, it's plug and play - if not I'll pull out IDS and get it sorted.

 

Swapped out old unit (circa 2003) with a circa 2008 unit.

Plug and play!

Thanks and we will see adverb temps are cold again