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The Latest Word on
Transponders
By now just about everyone knows that a
"transponder" is an electronic encoded device installed in the ignition key
that allows the key to communicate with the ignition lock and the vehicle's
electronic control module (ECM). The engine will start only if a proper code
is recognized. What you may not know is that there are three basic types of
transponders, one of which can be "defeated" under the proper conditions.
The three transponder types -- either fixed
code, rolling code, or encrypted code -- differ only in the manner in which
the key code is assigned. In a fixed code system, one unique code is
assigned by the manufacturer to the transponder embedded in the key, and it
never changes. With a rolling code system, the ECM randomly changes the code
with each engine start and reprograms the key to the new code. An encrypted
code system "scrambles" the code as it is transmitted back and forth between
the key and the ECM, and the ECM changes the code with each engine start.
The rolling code and encrypted code
transponder keys cannot be cloned. A duplicate key can only be obtained
through the dealer from the manufacturer. However, a fixed code key can be
duplicated -- by a properly trained expert using sophisticated (and very
expensive) equipment.
There are two ways a thief can make a
duplicate key for a fixed code system. First, using an aftermarket
programming/servicing tool (available to independent locksmiths) he (or she)
can defeat the steering column, gain access to the ignition switch, and
energize the vehicle electronics. This takes some talent and training,
because the transponder ring antenna encircling the ignition lock, must
remain attached and undamaged, and the thief must have a new, non-programmed
key for that specific vehicle present and in very close proximity to the
ring antenna. Under these conditions, the programming tool will read the
code stored in the ECM, will assign it to the new key, and the engine can be
started with the new key.
A second method uses commercially available
cloning equipment, and requires that the original transponder key be
inserted in the device. The fixed code in the transponder is read and stored
in memory. When a new, non-programmed key for that specific vehicle is
inserted, the new transponder key is programmed with the code. The key can
then be used to start the vehicle.
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Although
insured
Remember
kiddo
They don't
pay you
They pay
Your widow!
Proper
distance
To him
Was bunk
They
pulled him out
Of some
guy's trunk!
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(Courtesy
of Burma-Shave) |
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