Update

My Daughter and my LR2 have returned.

So I decided to try the other key fob

The conditions were not the same as what I had above

Vehicle unlocked

Engine off

I tried to lock and unlock with the other fob.

It works.

And it started my LR2 no problem

I am shocked and confused.


I did run the engine about 6 minutes to make sure everything had synchronized


Now I don’t understand why it would not respond to the other key fob for my Daughter


The is one important difference between the key fobs; the “problematic” key fob has been rebuilt with a new battery and the one I used today for the first time in about 6 weeks worked fine but it has never been rebuilt and it is 14 years old


I guess I need to reference a different Police Song “The Ghost in the Machine”



Take care

Paul

Just to make sure we are all on the same page, once the car has sat unused for 28 days, it will go into deep sleep mode, when this happens, no key fob will be able to unlock the car. It then has to be done manually with the Key Blade, this will set off the alarm, which can only be silenced by inserting the fob in the docking port.

Once this has been done the car will respond to the key fobs again. If the car is left unused for 28 days again it will it will go back into deep sleep mode again. 
Hung like Einstein, smart as a horse.

IIRC, if a particular key (a spare for example) is not used for an extended period of time, the vehicle will consider that key to be "lost", and it will not open the doors remotely. It will still start the vehicle, at which time it will be restored to normal status.

Obviously if you don't have a "non lost" key handy, you'd have to use the manual key for entry.

Shiggsy and Merlin,

The point that the two of you are making is exactly as I am trying to figure out


Possible options

1. The Vehicle thinks the key is "lost" and it disables the remote opening (My Audi did this)

2. The vehicle enters a protective low quiescent current mode after an extended period of non use (28 days)


It seems unlikely that option #1 happened to the key fob that was used more often and that it didn't affect the other key FOB.

For reference when my Audi had the problem even an unlocked vehicle wouldn't respond to the "Lost" key fob.


This does bring up a few questions

- How can it be determined that the vehicle is in Deep Sleep? Security LED blink rate?

- Will locking and unlocking reset the clock? Or does the engine need to run?


Here is the data for my LR2

04 Nov 2021 6:34 PM (Vehicle locked)

04 Dec 2021 3:28 PM (Emergency key required)

That certainly is more than 28 days.


Shiggsy it does look like you are correct that deep sleep is the root cause.

Thanks

Paul

I don't recall of a fob becoing 'lost' through no use mentioned on here. Plenty of situatons where only one fob is used and the other is left permamently in a draw and then won't work because the battery has discharged too much and can't be revived.

Unlocking and locking doesn't reset the timer, been there done that. 
Hung like Einstein, smart as a horse.

Shiggsy,

It is helpful to understand the failures experienced by others.

The depleted battery is "Use Case" dependent as you correctly pointed out.


The good news

I learned something new about my Land Rover. It gets angry every 28 days. Lunacy???


The bad news

It may take another 14 years for me to get another data point; so this thread may be quiet for a while.



Thanks for your input

Paul

Lightwater wrote:

At least she didn't have to lie on the roof of the car & reach down to manually unlock it & reach back across to the other side with a stick to open the driver's door. Could have been embarrassing!