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All Forums > Tech Talk > Tech Talk Forum Page 46 > Immobilizers... false sense of security?
AuthorPost
kicker_f1
Member


USA
436 Posts
7/04
Posted - Nov 8 2005 : 2:44PM
The manual says if you have an immobilizer in your automobile there is no way a thief could hot wire and start your engine and take off. How accurate is that information?


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ShiWarrior
Senior Member

1170 Posts
8/01
Posted - Nov 12 2005 : 4:00AM
A professional theif can get around anything.
it just makes it harder and longer for them, so its a good thing to have it

an imobilizer means that if u hot wire the car the engine's imboliser will kick in and trys to stop the engine from running
but of couse there are ways around that.


Regards & Thanks, ShiWarrior - - BIG Breast Fan - -

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licker
Senior Member

Heretic, Iconoclast, Skeptic
1141 Posts
8/03
Posted - Nov 12 2005 : 7:38AM
In some later model cars, I think the coil primaries are fired directly from the computer - there is no Kettering distributor on the engine, i.e. no "points". The immobiliser is also implemented in the computer's firmware. In that case, if the computer refused to play, the car would not go, and there's not a lot the thief could do about it. There would probably be no ignition and no fuel injection either.

Of course you can "get around" anything, but in this case the thief would have to bring along an engine management computer of his own (that was compatible with the car and also willing to obey him.) Once he plugged this in place of the real one, the car would be "hot wired".

Maybe just a hacked ROM chip would do, but I don't know if those things are pluggable in cars.

Or he could use a tow truck

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Kperv
The Cuddler

*struck
(She slipped)
1818 Posts
1/04
Posted - Nov 12 2005 : 8:32AM
kicker_f1
Member

USA
436 Posts
7/04
Posted - Nov 12 2005 : 6:43PM
My car came with a immbolizer and I recently had a Viper 350 HV security alarm system installed. I think my car is safe on a way. I don't leave any valuable on sight for the thief to go to thru all that for just a car, plus they are better and pricier automobiles than mine. So I'm definitely safe now, I will be getting my windows tinted, and then get my audio system package :)
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Drew Black
broken crankshaft

8011 Posts
9/99
Posted - Nov 13 2005 : 9:10AM
This is true in Lexus, BMWs, Audis, Mercedes and VWs. There's a single chip microcontroller built into the plastic end of the ignition key that communicates with the security system controller. There's typically 3 - 15 CPUs in modern cars all talking to each other on the CAN (Controller Area Network). The ignition key authentication scheme used in the German cars is distributed between multiple controllers.

A few of the new factory immobilizers are implemented in their drive-by-wire systems where there's no mechanical link between the gas pedal and the fuel injection system. The computer does everything.

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jamesn
Senior Member

Cambridge, MA
750 Posts
1/04
Posted - Nov 13 2005 : 6:07PM
i've got one in my volvo, it's a pain in the ass to get replacement keys programmed and i needed some because apparently you're not supposed to keep two keys within 6 inches of each other for long or they lobotomize each other. like they did in my bag a while ago, i can vouch that the car won't start.

if someone can get through those things, they're going to steal your car whatever you do to protect it-you're never going to stop those theifs but it's probably a deterrent to someone not planning on putting it alongside another dozen of your model on a freighter to asia.

what i really hate is the keyless mb's, i think they're just a ploy to let the owner laugh at you trying to manipulate it.

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