Won't start after new battery

security problem in ur key just get a new key made or ur key chip recharged if that doesn't work may have to get ur security bipassed

many things will cause no start problems could have faulty ignition switch.use test light see if power going to starter if not check ignition fuse to starter.if power going to starter, more likely starter solenoid or starter faulty.if ignition fuse okay and starter and solenoid okay still no start problem could be in the ignition switch or inhibitor switch faulty.code scan for faulty theft security system which will also cause no start conditions.

Have you checked the connections on the battery ? sorry if it seems a daft question.

The voltmeter should only go as high as 14-15 volts when the engine is running. I would check for a poor connection between the battery and starter.

Here is a link to help with the security light

http://vatspasslockpasskeysecurityhelp.yolasite.com/

YEP STARTER OR STARTER SOLENOID BAD, COULD HAVE CORRODED WORN OUT BATTERY CABLES, THE CAR CAN BE IN THEFT SECURITY MODE.HAVE VECHICLE CODE SCAN.

Hi, those can be particularly nasty to diagnose. I had a 96 park avenue-same thing after I hit a deer. OK, some info please. Did you hit anything? Replace a starter or battery? Have a new key made or have very old keys? Replace an ignition lock cylinder or have a problem turning key? Those things can trigger the passlock anti-theft system. Seems your car is in lock-down mode. (It thinks its being stolen.)
Please reply, we'll try and find a solution. Thanks, Mike

cant help a lot on this,yes it has a sleep mode mine has as well to conserve battery life,try asking your local jaguar dealer if they have come across this before and what the cure is.if they say expensive repairs then fit a battery isolator switch or a direct feed cable with a switch in cab somewhere from battery to altenator or a feed from starter motor relay to altenator

The factory security light will remain on - this is a standard feature indicating the car is dead.
First, unplug the hazard fuze in the engine bay (this will reset the ecu and remove the flashing)

Next, replace the battery with a new one (or one with proper charge) - keep in mind a small battery will not do anything for these cars, the engines require a lot to push them over (it isnt a honda)
*Make sure to clean the positive and negative battery cables from acid

Then just start it up :)