I lost my only keyfob. It has to be somewhere near my garage.

When I press the lock button on the passive lock door, I get a double beep.

Does this mean that the computer detects my key inside the car?

It doesn't detect it when trying to start the car, and says insert key fob into slot. So I am guessing no.

But I'm just wondering, as it is odd behavior, and maybe it fell somewhere. Neither my XJ nor Range Rover do the same when testing.

 

I thought a double-beep when attempting to lock the car meant that one of the apertures (doors, boot, bonnet) was ajar.

 

That's definitely the case, and also the case when attempting to lock with the button when the keys are in the car.

Can anyone test their XK, unlocked, with the keys nowhere near the car (to where it shouldn't lock)? Double beep?

 

Just checked - and that is correct. Attempting to lock the car with the fob away from the car produces two beeps and the car remains unlocked.

 

Thanks, it was worth a shot

 

'course it could still be that the fob is in the car somewhere - but has a completely flat battery...

 

True. I have a replacement aftermarket key on the way and hopefully I can program it with my SDD laptop. However that still doesn't solve the issue of the physical key, which I've used many times in a dead battery situation.

 

US members who "double lock" their X150 will get a "beep beep" from the sounder,. That double beep is an error message that means your car is not double locked. That's because double locking is not available on US market cars.

Double locking is not available on USA market vehicles because NHTSA deemed it to be unsafe. Double locking is popular in Europe because it makes cars more difficult to steal. However, because the doors cannot be opened from the inside when double-locked, a small child or other passenger can be trapped inside and die from extreme heat.

When you double-lock your car, the beep-beep is an error message to tell you that your car is not double-locked. Visual confirmation that your car is locked is that your side mirrors automatically folded in, unless you disabled that feature or your car is not equipped with that feature.

For more information:
See: NHTSA January 2009 Double Locking

 

Fascinating. I never knew that. All the same, I don't think you can double-lock the doors on a euro car from the door button anyway - which is what we were testing here.

 

I don't have that feature but I think pressing the button twice within 3 seconds will double lock it.

My '10 XKR is a Japanese import and they have low range fobs so if I stand too far away from the car when trying to lock it with the button on the door handle I get a beep so I suspect the beep is the car telling you it can't see a fob.

 

Actually, a Double Beep means a few things... either an access point, hood or bonnet is open. Otherwise, it CAN be a key detected inside the vehicle. This happened to me several years ago when I thought my grandson lost my second key. I found it, battery dead, stuffed under the PAX seat. I had problems locking the car for about a week before it started working fine, which I surmise was due to the fob battery dying. I paid a crapload for a new dealer key when all I had to do is look better.

 

many many other US cars arm their alarm system on the second click of the lock button, and they typically beep twice when doing it, and that's been colloquially called double-locking, which only serves to confuse the situation more.

 

All the Fords/Lincolns I've had recently lock silently on the first press, then verify Locked on the second press. That aligns with the Jags I've owned.

 

Just to confess - in my earlier post I said I didn't think you could double-lock (i.e. deadlock) these using the door button. That was nonsense. I've just checked and you can indeed deadlock a UK car using the door button. Perhaps if I'm brave I will test whether you can lock or deadlock my car with the fob left inside one of these days.

 

Leave a window open.

 

Just to say: in a controlled experiment(!) I have confirmed that the car will NOT lock when there is a fob inside the car, and produces the double beep when you try to lock it from the door handle. Of course this would only be true provided the battery in that fob is not flat...