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BYPASSING FACTORY THEFT
DETERRENT SYSTEMS
Many newer vehicles are now factory-equipped
with anti-theft systems that use either a
resistor coded key or a passive transponder
that disables the fuel system unless a properly
coded key is inserted into the ignition cylinder.
To integrate a remote starter into these
vehicles, you must determine which type of
factory anti-theft system is equipped, then use
the proper bypass module for that system.
General Motors Anti-theft Systems:
Many late-model GM vehicles are equipped
with one of three basic anti-theft systems;
Passkey, Passlock, and Passkey 3. Standard
Passkey systems are easily identified by the
resistor chip visible on the shaft of the key.
Passlock systems do not rely on a resistor
equipped key. Instead they use a resistance
code generated when the key is turned in the
ignition cylinder. Both of these systems have an
anti-theft indicator in the instrument cluster.
To properly interface into these systems and
retain full functionality of the factory anti-theft
system, VATS/PASSLOCK bypass module must
be installed.
The Passkey 3 system, which is found on GM
vehicles 1999 and newer, is a transponder based
system described below.
Passive Transponder Systems:
Passive transponder systems have become the
most popular anti-theft system among vehicle
manufacturers (Ford, Honda, BMW, Toyota,
Nissan and others). This system requires use of
a tiny passive transmitter housed in the base of
the key. This device activates when placed close
to the vehicle’s ignition switch. The starter will
usually crank but the fuel system will be
disabled, not allowing the vehicle to run, if the
transponder is not detected. To properly
interface into transponder systems, a
transponder bypass module must be
installed. These modules allow full
functionality of the factory anti-theft system
and usually require the use of a spare key.
ADDING TRANSMITTERS
To add a new transmitter to the system have
the desired transmitters ready and follow the
Code Learning sequence.
To enter Code Learning Mode:
1. Turn the ignition on, off, on, off and leave on.
• The LED will flash.
2. Press and hold the Valet switch.
• The status LED will turn on, then flash 3
times and turn off.
3. Release the Valet switch.
4. Press the Lock Button on the transmitter.
• The LED will flash.
5. Repeat step 3 for each additional
transmitter, up to four total transmitters.
• The LED will flash to indicate the
transmitter number learned.
6. Turn off the ignition.
• The lights will flash 3 times.
NOTE: If a transmitter is lost or stolen, make sure
to code all 4 transmitter memory locations.
(Example: If only one transmitter is used, repeat
step 3 three more times to remove any
previously programmed transmitters.)
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