Umm am I Big C?

 

easier than spelling it out bigC!

My engineer brain egging you on..

 

Get in your car without a key, have someone else 'double-lock' it and walk a good distance away. See if you can exit using the inside door handles. If so, not double locked.
If you are trapped inside, call consumer protection or DOT or something because your car is illegal in the US.

 

Well bummer, can’t change my username.
But you guys can call me whatever you want.
Just don’t call me late to dinner.

But to put this to rest:
The double lock feature (also known as deadlocking) on Jaguar X150 models is a security enhancement primarily available on UK and European market vehicles.
When activated by pressing the lock button on the key fob twice within three seconds, it arms the full alarm system, including perimetric protection (doors, hood, and trunk), interior intrusion sensors (detecting movement inside the cabin), and inclination sensors (detecting tilting or lifting of the vehicle).
Critically, it also disables the interior door handles, preventing the doors from being opened from inside the car even if a window is smashed or entry is otherwise forced. This serves to deter "smash-and-grab" thefts or break-ins where a thief might reach in to unlock the door manually, providing a higher level of anti-theft protection compared to single locking, which only secures the exterior and allows internal unlocking.

The feature is market-dependent due to differing regional priorities between security regulations and safety considerations. In the UK and Europe, stricter anti-theft standards (influenced by insurance requirements and EU vehicle security directives) encourage or mandate such systems to reduce vehicle crime rates, which historically have been higher in those regions. Jaguar included it as standard on X150 models sold there to meet these expectations and improve security ratings.

It is not available on US-market X150 models primarily for safety reasons. Disabling the interior handles could trap occupants inside during emergencies, such as crashes, fires, or medical issues, potentially leading to injury or death if quick egress is needed.
US federal safety standards (like FMVSS) emphasize occupant protection and rapid exit, and manufacturers like Jaguar opted against including deadlocks to avoid liability risks and comply with a cultural/regulatory focus on safety over maximum theft deterrence. Instead,
US versions typically arm only the perimetric alarm with a single lock press, without the interior disable or full sensor suite.

So in other words, the UK values things. The US values people.

 

The explanation aside, yes I just tested it.
Tried to record it to post to YouTube, but didn’t work out so well.
This will throw off my locked voltage experiment as during the testing of the locking, I set off the alarm.
so I’m sure that’s worth a few mA of draw.

 

We are missing the point..

"Does pushing the lock button twice really decrease the draw on the battery ".

There..I said it.

Looking for definitive not anecdotal confirmation..

 

Battery in my car was not even a year old when that happened.Matter of fact It was working good before I changed the old one out, cause the old battery no longer cranks from a jump or anything.Put the new battery in and driven it like that for a couple of months and the screen got permanently stuck.But then again i had another problem where I didn't put refrigerant in for the AC when it needed it bad and maybe that had something to do with the screen freezing permanently as well since it also controls the temperature in the car.Long story short,I didn't never get it fixed and i traded it in for the last gen Jag and kept it for a few years and then I traded that one in for this XKR-S that I have now😎that might be my best advice...gotta trade it in🤣

 

in the longer term, no it increases it because the alarm is set and drawing current.
In the shorter <30 min, yes because it turns off convenience mode which draws more current than the alarm that is now set...
do what Guy does if you can, put the jag in a safe place, exit it, smile at how good looking it is, come back the next time and start it up...drive away smiling.

wj

 

YOU are the 1st person to say locking your car will drain the battery more overnight!

The other theory was shutting it down shuts off all auxiliary drain while not locking it may leave some accessories active hence draining the battery.

Other thoughts?


So..with this mindset..never lock the car..

 

Not a theory!
The alarm system draws current when activated.
Locking activates alarm system.
I hope that makes sense.
WJ
I did not say nor imply not locking.

 

I've said it before, but here it is again:
Since MY car does it, I'll assume ALL do it.........
Locking my doors does not affect Alarm State. Closed and off, the alarm is always on, much to my wife's chagrin. She has a habit of opening her side before I get to 'my' side and of course the alarm goes off every time. Not locked. Not "alarmed". Both sides operate the same way, if the door being opened doesn't have the key near it, the alarm will sound.

 

Interesting....

So alarm light flashes without locking?

1st time heard this..

So the battery drain is the sale whether u lock it or not@!

Just opened and fired up car...shut down, no logo on screen, interior lights went off 20 seconds.

NO FLASHING ALARM LIGHTS.

Going to be by new shutting down procedure...turn off stereo, auto lights,auto windshield wipers, climate control, turn off engine,close door and pray..

 

This is a bug, unless it is a MY difference.
On my ‘08, if it is unlocked, no alarm and no flashing red light on the far middle of the dash.
I can open and close anything at will.
If I lock it and put the key far away, then try to open any door, the alarm goes off.

 

One caveat to my Always On Alarm situation, and I'm too lazy to check because I don't remember this part... Is there a motion sensor or something integrated into the interior that may not be on when the car is not locked, conversely, a sensor that only comes on WHEN locked? I remember something from somewhere, but my old brain doesn't work as well as it used to work.

 

For those with the time.

32 pages of anti theft reading.

https://hillcopublishing.com/xk/pdf/anti-theft.pdf





wj

 

10/24 1pm - 12.63v

 

Early results it's draining more?

 

Seems so, but at .3v over less than 48 hrs, I’d say there is more to it than just a flashy light and sensors.

Sadly, The experiment will be coming to an end.
Starting the weekend early by taking all 4 wheels off and cleaning and coating the rims.
The brake dust is getting out of hand and a pain to clean all the time.

 

There is an ultrasonic motion sensor alarm, but I think only on the UK spec vehicles (I think that’s what those two round vent type openings in the roof console are for).

 

@wymjym
Thanks for posting the anti-theft pages.
It did not occur to me that passive arming is different from passive locking. Got me to searching.
Passive arming, our option, turns on the perimeter alarm after 60 second when all doors, hood and trunk are closed.
If an fobless unfortunate happens to open a door, all hell breaks loose.
Alarm without locking seems counter intuitive.

@Cee Jay would life be better turning off the passive arming feature?

XKs, XFs and probably XJs have the ability to select passive arming from the touch screen.
Newer JLR products require diagnostic access to make the selection.