Faraday box steering lock

[wheeler]

If you mean the battery for the remote locking then this has no effect on the ability of the fob to start the car. You need a Faraday shield to stop the probing signal from outside the house activating the fob.

The fob battery is needed to open & start the car handsfree, without a fob battery you would need to hold the key on the sensor at the steering column to start the car.
With the sleeping batteries if the fob is still for a certain amount of time the battery effectively disconnects meaning relay theft wont work. Even if you leave the fob inside the car & the sleeping battery has activated the car will not start.

[Paul-R]

D'ohh. I was thinking it was a regular key fob, sorry.

[Djandree]

Yes battery for a fob. Battery is going into sleep mode after some time, fob behave like there is no battery in it, hence don't emitting any signals. After discovering any movement battery is start working as it should. Even if you are parked and the fob doesn't move (even inside the car) you won't start a car. Little shake up and it's working again

[Sloppysod]

,........
With the sleeping batteries if the fob is still for a certain amount of time the battery effectively disconnects meaning relay theft wont work. Even if you leave the fob inside the car & the sleeping battery has activated the car will not start.

Are you saying that the fob "goes to sleep" if not used for a period of time?

[wheeler]

The battery in the fob goes to sleep so yes the fob effectively does too. Its like removing the battery from the key. Once the key is moved the battery wakes up again

[Sloppysod]

......you've just made me read the owners manual and found this in the locking section.
Not a section I would feel I would need to read.

Just thought I'd check my 'Spare' fob, and guess what, it doesn't work, so tomorrow I have to reinitialise the fob, may even have to replace the battery too.

So from the start of a small post I have found out something, and then had to do something else..........

[Rob112]

Think I'll stick with Faraday box!!!

[Djandree]

If battery is going to sleep mode a fob is not emitting any signal to intercept (it is like you would take the battery out) , hence no need Faraday box

[Paul-R]

Yes but could potential thieves wake the fob up from outside the house if it's not in a Faraday cage?

[mickthemaverick]

As I understand it, it has to be physically moved to wake it up, is that right?

[Sloppysod]

If it's gone yo deep sleep, >21 days it has to be reinitialised by holding it on to a sensor on the steering column and the car started.

And it works, carried out the procedure to day.

[wheeler]

As I understand it, it has to be physically moved to wake it up, is that right?

Correct, with a sleeping battery fitted the remote has to be physically moved to wake it up.

The problem with a faraday pouch/box is that you need to remember to actually put i in the pouch/bag. With a sleeping battery no additional action is required by the user, it goes to sleep & wakes up automatically.

[Paul-R]

So basically this is version 2 of a contactless fob. Version 1 didn't go to sleep, could be hijacked from outside the front door and needed to be put into a Faraday cage to stop remote starting by a thief.

[Djandree]

To be honest. If someone is tailing you he could record your fob anyway. To have it in a faraday pouch in your car is not an option. Well it is possible to drive with your key not detected) but if your engine stall on the cross road.. you have to take it out really quick)

[Sloppysod]

I have both my off key fobs in separate pouches at home and keep them in them unless I'm using my car (NB:- "home is whererver I lay my hat").
I accept there could be a risk while out and about but you have to draw a line under paranoia somewhere.
If my car is stolen/damaged, I don't plan or telling my insurance company that I "..didn't take reasonable precautions ", to stop my car getting stolen.