Cobham Sainsburys - jamming central locking - BEWARE

[anonymous-user]

[redacted]

[fathomfive]

anonymous said:

[redacted]

[addey]

This is my local Sainsburys and i'm there a couple of times a week so very useful to know! Thanks for posting

[Simbu]

I've had my remote locking jammed at a sainsurys before. I assumed it was those stupid parking sensors in the middle of the spaces. But since it's only happened once maybe it was something more sinister!

I always check the car is actually locked, but I suspect a large part of the population don't bother!

[iva cosworth]

Romanian.........nuff said

[Carrot]

Thanks for the warning - luckily my car is too old and cheap to have remote central locking so I am immune But I will pass on to those that do.

[FreeLitres]

Thanks for sharing!

Would it be possible for him to have a device that "records" the radio signal emitted from your key fob so that he can use it after you have left the car?

I would imagine that a device that simply scrambles the signal would have limited use as I expect most people watch (or listen to) their car for confirmation of locking. I for one never leave my car unless I have heard the lock and seen the indicators flash.

[Trommel]

This wouldn't happen at Waitrose.

[Blakeatron]

Technology pah - even after 'bleeping' I check one front door, 1 back door and the boot are locked...

Also have to check the house front door at least twice before I am happy that it is locked.

OCD - me?

[rottie102]

FreeLitres said:

I expect most people watch (or listen to) their car for confirmation of locking. I for one never leave my car unless I have heard the lock and seen the indicators flash.

You're seriously expecting that a mum who has just unloaded three bored and noisy children now running to the shop or a teenage girl on her mobile discussing last night's party does the same?? I'm sure there's plenty of people just pressing the button and walking away.

[McSam]

FreeLitres said:

Would it be possible for him to have a device that "records" the radio signal emitted from your key fob so that he can use it after you have left the car?

I would imagine that a device that simply scrambles the signal would have limited use as I expect most people watch (or listen to) their car for confirmation of locking. I for one never leave my car unless I have heard the lock and seen the indicators flash.

As far as I know, yes, that is perfectly possible. There's no reason why a good receiver can't pick up and identify the signal your remote sends, exactly the same as your car's alarm system does. Difference being that it just has to record, and regurgitate the signal after you've gone..

I suppose, though, that if modern cars with two buttons on the fob use a different signal for locking and unlocking, that's more secure.

There only has to be a small percentage of lazy/absent-minded/busy-day people who don't notice the car's not locked to make it worthwhile, I guess..

[dilbert]

FreeLitres said:

Thanks for sharing!

Would it be possible for him to have a device that "records" the radio signal emitted from your key fob so that he can use it after you have left the car?

I would imagine that a device that simply scrambles the signal would have limited use as I expect most people watch (or listen to) their car for confirmation of locking. I for one never leave my car unless I have heard the lock and seen the indicators flash.

You can record, but there is no point. The signal is different each time. Unless they listen to every door locking/unlocking event that you ever do, they can't know what's going to come up next. This is also why your fob won't open your neighbours car.

[McSam]

dilbert said:

FreeLitres said:

Thanks for sharing!

Would it be possible for him to have a device that "records" the radio signal emitted from your key fob so that he can use it after you have left the car?

I would imagine that a device that simply scrambles the signal would have limited use as I expect most people watch (or listen to) their car for confirmation of locking. I for one never leave my car unless I have heard the lock and seen the indicators flash.

You can record, but there is no point. The signal is different each time. Unless they listen to every door locking/unlocking event that you ever do, they can't know what's going to come up next. This is also why your fob won't open your neighbours car.

I thought this was simply that each car (nowadays, anyway!) has an entirely unique signal? I don't have any firm knowledge, though, so..

[okgo]

Trommel said:

This wouldn't happen at Waitrose.

No, because the car park would be full.

[dilbert]

McSam said:

dilbert said:

FreeLitres said:

Thanks for sharing!

Would it be possible for him to have a device that "records" the radio signal emitted from your key fob so that he can use it after you have left the car?

I would imagine that a device that simply scrambles the signal would have limited use as I expect most people watch (or listen to) their car for confirmation of locking. I for one never leave my car unless I have heard the lock and seen the indicators flash.

You can record, but there is no point. The signal is different each time. Unless they listen to every door locking/unlocking event that you ever do, they can't know what's going to come up next. This is also why your fob won't open your neighbours car.

I thought this was simply that each car (nowadays, anyway!) has an entirely unique signal? I don't have any firm knowledge, though, so..

It depends how you came to that conclusion.

If you looked at the fob and realised that it has a unique number, then yes. That's how you replace the fob. Certainly my own 10 year old Valeo system also needs "synchronisation" between the fob and the car. Although when you buy a replacement fob, it must have the same number, you have to tell the car there is a new fob being used, and actually "show" the fob to the car.

I guess you could get into the car by listening to the radio signal, but you'd need to know the number on the key fob too.

Obviously a small hammer is a pretty effective means of getting inside a car too!

Edited by dilbert on Sunday 12th September 13:56

[Frederick]

McSam said:

dilbert said:

FreeLitres said:

Thanks for sharing!

Would it be possible for him to have a device that "records" the radio signal emitted from your key fob so that he can use it after you have left the car?

I would imagine that a device that simply scrambles the signal would have limited use as I expect most people watch (or listen to) their car for confirmation of locking. I for one never leave my car unless I have heard the lock and seen the indicators flash.

You can record, but there is no point. The signal is different each time. Unless they listen to every door locking/unlocking event that you ever do, they can't know what's going to come up next. This is also why your fob won't open your neighbours car.

I thought this was simply that each car (nowadays, anyway!) has an entirely unique signal? I don't have any firm knowledge, though, so..

Most use a rolling code system, which is why you need to have your keyfob resynchronised to the car (most of the time) if you take too long to change the battery. If the fob is giving 1111 and the car is expecting 1234 then it's not going to open. It's designed to stop code grabbers and the like, used to be a big problem in the early days of RCL as they only used a static code, once that is grabbed - the car could be unlocked.

[McSam]

Ah.. I knew that the car had to be "paired", if you like, with a new remote - even if it was ostensibly exactly the same - but not that that was exactly why, to synchronise the rolling code list. Thanks for the info! I guess they're more secure than I give them credit for

[Shmee]

It took my absolutely ages, like 20 tries of opening doors and all sorts to get my car to lock last night in Knightsbridge; it never occurred to me that there might have been someone jamming it up nearby - I wonder.

[troc]

Blakeatron said:

Technology pah - even after 'bleeping' I check one front door, 1 back door and the boot are locked...

Also have to check the house front door at least twice before I am happy that it is locked.

OCD - me?

Yeah, I have the same habit - which is great on most cars but totally and utterly useless on the new one with keyless entry because as soon as you try one of the doors, it unlocks again! I have to check for the one teeny little red LED in the drivers door.

However, my agonised cry of "Doh!" that reverberates around the car park at work when I do this every. single. day. appears to amuse my colleagues somewhat so that's OK.

[Shmee]

troc said:

Blakeatron said:

Technology pah - even after 'bleeping' I check one front door, 1 back door and the boot are locked...

Also have to check the house front door at least twice before I am happy that it is locked.

OCD - me?

Yeah, I have the same habit - which is great on most cars but totally and utterly useless on the new one with keyless entry because as soon as you try one of the doors, it unlocks again! I have to check for the one teeny little red LED in the drivers door.

However, my agonised cry of "Doh!" that reverberates around the car park at work when I do this every. single. day. appears to amuse my colleagues somewhat so that's OK.

You an I have basically the same car, but you can also just watch for the indicators to flash surely? Although I too check for the red light when I lock the drivers door, but that's never a problem because surely you are always standing next to it when you do actually hit the lock button on the handle?