Clubjazz - Honda Jazz & HR-V Forums
Honda Jazz Forums => Honda Jazz Mk4 2020 - => Topic started by: mosessage on May 02, 2021, 01:33:57 PM
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The Mk 4 Owners Manual states that the key fob's signal reception can be switched off by holding down both the buttons at the same time for 3 seconds. This reduces key fob battery consumption, but does this also reduce the potential for so-called "relay crime", and make the use of faraday cages unnecessary?
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I suppose yes! At least it does with the Toyota key fobs, I suppose the Honda fob works the same:
You can disarm the keyless system once. This is called Energy Saving Mode. When the power saving function is enabled, the battery will drain less quickly. The radio waves from the electric key are then stopped and the 'keyless entry' function is then switched off. This will prevent thieves from picking up the signal from the key and using it to open and start your vehicle.
If you hold down the "close button" (In the red box)
And press the "open button" twice (in the green box) then the key switches to the energy-saving mode.
You can recognize this by the red light which will flash 4 times.
Pay attention! the function switches off when you press one button.
Translated from: https://www.vanekris.nl/toyota-nieuws/voorkom-mogelijke-diefstal-bij-keyless-entry/
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When did this become a Toyota forum?
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If I could have found the information for the Honda key fob I would post it here. Then it would remain a "pure" and "clean" Honda forum, wouldn't it?
Unfortunately, I did not find that information. But maybe Jocko can help mosessage better? ;)
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I've been doing this after I've put my Crosstar in the garage and can confirm I can't get back in the car the next day unless I press one of the fob buttons
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So... not Jocko but Bristoll_Crosstar confirmed! ;D
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The handbook could be more explicit but this is mentioned as a margin note on page 169 of the on-line (PDF) version of the owner's handbook. See 2nd para of the attached extract. When I got my Crosstar I demonstrated this to the salesman who was unaware of this feature.
It's best to press and hold down the lock button first then press the unlock button until the little red LED flashes (it seems longer than 3 seconds). Don't forget to also do this to the spare remote.
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Thanks All - Yes I saw page 169, but what confused me somewhat was the statement that the "reception" will be turned off. I would have thought that switching off the transmission would be more important, since that is what the relay thieves are presumably after. But maybe if the reception is negated then the keyfob cannot answer.
It's just that I was looking to buy a faraday pouch, all of which seem a little bulky for pockets, and therefore if the keyfob can be isolated, then the pouches wouldn't be necessary.
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The wording isn't good: Effectively (if not in reality) transmission is turned off because the reception is disabled. I presume the system operates by the vehicle (which has the bigger battery) doing the frequent transmitting of a signal and the remote then pings back a reply to form the connection. If the remote can't receive then it won't transmit.
As already noted, you can test this by approaching the vehicle with a disabled remote. The vehicle won't unlock until you wake up the remote. This also means that a disabled remote can't be used for a relay attack (which was your original question). It's unfortunate that this important security feature isn't mentioned more prominently in the book. Perhaps Honda didn't want to emphasise this as a new and useful feature because people might ask why it wasn't done sooner.
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Controversial, but I always considered the possibility that some manufacturers maybe wanted cars stolen and wrecked. They then get to sell another car via insurance.
Just me over thinking :)
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Controversial, but I always considered the possibility that some manufacturers maybe wanted cars stolen and wrecked. They then get to sell another car via insurance.
Just me over thinking :)
Gosh, and I thought I was an old cynic!!
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Hi All :)
I am quite glad this is possible. This was one of the questions were were asking at the Honda Dealership, and they were not aware that the key-less entry could be switched off.
Once it has been switched off, I presume it would stay that way? At least until you activate it again? (It wont automatically switch back on after you start the car again?)
thanks
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Welcome to the forum. I think you would have to re-activate it to start the car.
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You need to activate it or you won't be able to get in to start the car.
IIRC you press any button to reactivate it.
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So its not as simple as 'de-activating' it and continue using the key fob as normal (one click lock and unlock)?
I guess I will have to wait for the car and start playing around with it :D
Thanks for the replies! You will probably see me about with more silly questions then ;)
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IIRC, when you arrive home, lock the car then press both buttons to deactivate and prevent a 'relay attack' before putting the key away overnight.
Then next time simply press either button to activate the key.
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It all sounds like a bit of a faff. You have to remember to deactivate the key when you put the car away, and remind anyone else who drives it to do it as well. And I suppose there's no way to check that a key’s been deactivated without turning it on and back off again? Much better would be a way to turn the keyless function off within the car (not the fob) so it stays off if you don’t want it, but it doesn’t sound as if there is. You do of course have the option of buying a car that doesn’t have it, but then you’d probably have to forego some other gizmos that you do actually want.
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And remember to de-activate the spare key. Otherwise that one is still vulnerable to a relay attack and will be slowly draining the battery while in storage.
Ideally there would be a little on-off slide switch on the side of the remote to deactivate it.
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Thanks all, yeah it does sound like a faff really, but I guess it is what it is.
Yes, i did think about not getting the key-less option, but it comes standard on the EX. I wanted the EX for the wife because it has the reversing camera, and also the other few extras.
Saves me fitting the rear camera myself, although I'm not not sure I would have been able to anyway, having read the thread about the Dash cam installation/ECU not letting people fiddle with the electrics (that's another question for a different thread!)
Regardless of whether its worth it or not, I wonder if its possible to get a new key cut, and have the remote re-programmed without the key-less entry? Would have thought so if its like that on the other models without key-less entry.
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Are there any reports of thefts of Jazz using the remote relay method? I can understand thefts of £50k plus cars using the relay method but to steal a Jazz!!
The switch off system is good for preserving the battery of rarely used second remotes and can be used for primary key if living in a high crime area - but again how many Jazz have been stolen this way?
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I've not seen any of the new Jazz models on the road yet.
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I've seen one Jazz Mk4, no Crosstar. Lots of MK2 & 3 around.
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Come down my road, there’s two, next door neighbour test drove mine and bought one :-)