XK / XKR ( X150 ) 2006 - 2014

Slow battery drain

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Old Sep 1, 2025 | 01:45 AM
  #21  
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Originally Posted by HealeyJag
Don't have one..

can you give me a brief synopsis since there seems to be some debate on this issue?

Never had an issue when my cars were young..

Now that I have one 17 years old........with a built in C-tek...

replaced alternator and battery..

all seems good 2 months later..

but very curious on the reality of the situation...
No problem, send me a pm.
 
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Old Sep 2, 2025 | 08:58 AM
  #22  
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I understand shutting down the car is a two stage process. You must lock the car twice, to obtain the maximum level of shutdown. Much like the European residential door locks of "double turn".
 
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Old Sep 3, 2025 | 10:00 AM
  #23  
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Originally Posted by sony2000
I understand shutting down the car is a two stage process. You must lock the car twice, to obtain the maximum level of shutdown. Much like the European residential door locks of "double turn".
Supposedly mot true in US..

Still waiting for workshop manual verification.
 
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Old Sep 3, 2025 | 07:16 PM
  #24  
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Originally Posted by HealeyJag
Supposedly mot true in US..

Still waiting for workshop manual verification.
No need for any waiting... Double Lock in the UK locks the doors so the inside occupants cannot open any door. Illegal in the USA and most of the world.
Open the windows, do the 'double lock' press, then open the doors using the inside handles. If openable, NOT double locked. The extra beep just means the doors were ALREADY locked.
 
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Old Sep 4, 2025 | 07:21 AM
  #25  
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Originally Posted by Cee Jay
No need for any waiting... Double Lock in the UK locks the doors so the inside occupants cannot open any door. Illegal in the USA and most of the world.
Open the windows, do the 'double lock' press, then open the doors using the inside handles. If openable, NOT double locked. The extra beep just means the doors were ALREADY locked.
So the question still remains, does locking the doors impact battery drain?
 
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Old Sep 4, 2025 | 07:42 AM
  #26  
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Originally Posted by A6Gator
So the question still remains, does locking the doors impact battery drain?
Yes. Locking the doors shuts off Convenience Mode, which would otherwise stay on for around 20 minutes.

Convenience Mode is the state the car goes into when you unlock it or after you've stopped the engine - it's different from the ignition-on state you get by pressing the start button without your foot on the brake. The ignition is off, but a lot of the ancillary systems are powered up so you can do things like move the seats, listen to music, etc. Convenience mode ends when you lock the car; if you don't, it will eventually power everything down, but that takes up to half an hour while draining the battery since the engine is off and the alternator isn't running to charge the battery.


 
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Old Sep 4, 2025 | 08:45 AM
  #27  
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Originally Posted by Stuart S
Yes. Locking the doors shuts off Convenience Mode, which would otherwise stay on for around 20 minutes.

Convenience Mode is the state the car goes into when you unlock it or after you've stopped the engine - it's different from the ignition-on state you get by pressing the start button without your foot on the brake. The ignition is off, but a lot of the ancillary systems are powered up so you can do things like move the seats, listen to music, etc. Convenience mode ends when you lock the car; if you don't, it will eventually power everything down, but that takes up to half an hour while draining the battery since the engine is off and the alternator isn't running to charge the battery.

Great, Stuart. Guess I missed that when I got the car. Thanks for clarifying!
 
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Old Sep 4, 2025 | 09:09 AM
  #28  
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Originally Posted by A6Gator
Great, Stuart. Guess I missed that when I got the car. Thanks for clarifying!
You can express your thanks by pressing the button at the bottom left corner of the page.
 
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Old Sep 4, 2025 | 09:16 AM
  #29  
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if, after the convenience mode ends and the doors are not locked...is the drain higher or lower than with the doors locked?
wj
 
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Old Sep 4, 2025 | 10:42 AM
  #30  
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Originally Posted by wymjym
if, after the convenience mode ends and the doors are not locked...is the drain higher or lower than with the doors locked?
wj
Should be the same.
 
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Old Sep 4, 2025 | 11:31 AM
  #31  
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I’ll throw in my two cents so you guys can tell me I’m doing it wrong.


I leave the car in the garage, unlocked, and lately top down. I get in and out a lot without starting it, usually to open the hood, which fires up the HU Jaguar logo and the little annoyingly loud fan. (I know, that’s much later)

After reading recent replies here, I went and locked it last night. Which turns on a little blinky red light on the dash.
But alas, I’ll probably get in and out of it several times today, so it will stay unlocked.
Throwing caution to the wind!

 
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Old Sep 4, 2025 | 01:07 PM
  #32  
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Originally Posted by kj07xk
Should be the same.
but if locked via fob doesn't that initiate the alarm system which must be using some power?
WJ
 
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Old Sep 4, 2025 | 02:32 PM
  #33  
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Originally Posted by Circumnavigator
I’ll throw in my two cents so you guys can tell me I’m doing it wrong.


I leave the car in the garage, unlocked, and lately top down. ...
Leaving the top down will cause permanent creases in the fabric and leave the interior vulnerable to all sorts of bugs and pests - spiders, moths, chipmunks, and worse.

Just imagine what this little guy (and his mama) could have done if my garage door was open. Taken by my Ring Floodlight Cam mounted under the roof of my garage.

 
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Old Sep 4, 2025 | 03:33 PM
  #34  
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Exactly!!!

ALWAYS put the top up. Mine is 18 years old and still looks new.....

fingers crossed...

 
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Old Sep 4, 2025 | 07:48 PM
  #35  
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Originally Posted by wymjym
but if locked via fob doesn't that initiate the alarm system which must be using some power?
WJ
Good point. The break even point between power taken during a 20-30 minute shutdown vs the power drain of the alarm, would determine which strategy is best for your individual situation.
 
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Old Sep 5, 2025 | 07:02 AM
  #36  
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Old Sep 5, 2025 | 08:42 AM
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Originally Posted by kj07xk
Good point. The break even point between power taken during a 20-30 minute shutdown vs the power drain of the alarm, would determine which strategy is best for your individual situation.
As I have previously stated, my alarm is active even WITHOUT locking the doors.
 
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Old Sep 5, 2025 | 10:05 AM
  #38  
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Originally Posted by Cee Jay
As I have previously stated, my alarm is active even WITHOUT locking the doors.
@Cee Jay I now recall you said that, and scrolled back to reread your post. Does that only happen with the passenger door, or even with the driver door if you don’t have your key? Does it happen both top up and down?
I often go to the garage and open the driver door without the key nearby. Never tried the passenger door, as it’s next to the wall.
 
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Old Sep 5, 2025 | 11:04 AM
  #39  
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Originally Posted by kj07xk
@Cee Jay I now recall you said that, and scrolled back to reread your post. Does that only happen with the passenger door, or even with the driver door if you don’t have your key? Does it happen both top up and down?
I often go to the garage and open the driver door without the key nearby. Never tried the passenger door, as it’s next to the wall.
Yes the damn wall. The bane of every DIYer’s existence.

 
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Old Sep 5, 2025 | 12:20 PM
  #40  
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In the past, I have always locked my doors every time when pulling into my garage. However........Because of the oppressive engine heat the XK is giving off especially in the summer, I open my hood to slow down the cooking of the vulnerable plastics. My choice, the health of the cooling system or the battery. Naturally, I can't lock the car with the hood open, but I do automatically connect to my CTEK regardless if I'm pulling out the next morning. I'm OCD about keeping my battery fully charged at the same time trying to extend the life of the cooling system's plastics.
 
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