When you have a blank nav screen and a 50 51 on the small green LCD screen this means the screen lost communication with the nav module which is the reader in the trunk. The module will need to be replaced but you can try disconnecting the negative battery terminal cable for about a half hour to see if it will reset.
If the light cluster in question is the one on the tail gate then the most likely problem will be a broken wire in the loom at the hinge point of the tailgate.
This will definitely stop the car from starting as the ecu does not see the gearbox in Park or Neutral. Have a look at the cables on the side of the gearbox, they may need adjusting.
Check the ground points behind the headlights as a first port of call. They may look ok but, they corrode from the inside out, show them a spanner and they may well crumble.
Just had word back from a friend of mine, the alarm light should flash in the right hand side of the instrument cluster when it is armed.
Hope this helps.
Hi Paul,
You could try this place; https://www.satnavishop.co.uk
Id be tempted to take out your existing disc and give it a clean first, just in case.
Thanks for the kind words, I have enjoyed each and every Jaguar I have owned.🤙
If you are trying to input a postcode or address that is newer than the disc you have, then this may be causing your problem.
2012 is the last official disc from Jaguar though there are websites that provide more up to date information.
The fuse is F12 15A in the primary junction fuse box. It may also be the pipes that are blocked or the small filter at the pump end.
The bottle can also get gunged up so before you spend any money, check all the pipes are clear, the bottle and the filter.
The only way is through the aftermarket satnav websites where you can find up to date discs. The last official disc from Jaguar is the one you have now, 2012.