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FACTORY ANTI-THEFT SYSTEMS
FOR GENERAL MOTORS CARS ONLY
System 1: PASSKEY I and II system (1985 and up). This system has a resistor pill in the key. Measure
resistance of the pill using a test meter. A bypass module is available, part #VATS-WR module.
System 2: PASSLOCK I and II system (1995 and up). Passlock does not have a pill in the key. It has
a light on the dash that states ANTITHEFT OR SECURITY system. A bypass module is available, part
#GMBP-721 module.
System 3: PASSKEY III system (GM 1998 and up). Passkey III is GMs version of a transponder system.
This key will have the letters PK3 on it. A bypass module is available. (Part #781)
FORD ANTI-THEFT SYSTEM: PATS
Ford uses a bypass part #FBP-718 module, 1995-1998. (1999 and up will use part #781.)
CHRYSLER AND MOST IMPORTS ANTI-THEFT SYSTEM: TRANSPONDER
1998 and up will use part #781.
To order these bypass modules call 1-800-878-8007.
TESTING DOOR LOCKS
TESTING: Door Locks
There are three basic types:
"Type A" Door Lock Test (Most GMs and some Chryslers)
Probe both of your door lock wires going to the door lock switch usally located in the driver's kick
panel. Attach the clip end of your test light to a good chassis ground. Using the vehicle's door lock
controls, activate the lock then the unlock, testing both wires one at a time. If one of these wires
tests (+) positive when lock is pressed and the other tests (+) positive when they are unlocked, your
vehicle has a "Type A" door locking system. Make sure to mark which wire is lock and unlock. Proceed
to Connecting Door Locks, Connecting Door Locks. NOTE: "Type A" and "Type C" locks will test the same,
until you test for ground. Make sure you run both tests before making your connections.
"Type B" Door Lock Test (Most Imports, some newer Fords)
Probe both of your door lock wires going to the door lock switch usally located in the driver's kick
panel. Attach the clip end of your test light to +12V. Using the vehicle's door lock controls, activate
the lock then the unlock testing both wires one at a time. If the test light illuminates when you probe
the lock and the unlock wires your vehicle has a "Type B" door locking system. Make sure to mark which
wire is lock and unlock. Proceed to Connecting Door Locks.
"Type C" Door Lock Test (Most Fords, some Chryslers, GM Trucks)
(Optional part #778 required)
Using your test light probe both the lock and the unlock wires usually located in the driver's kick
panel. Attach the clip end of your test light to ground probing both wires one at a time while locking
and unlocking the doors with the driver's side switch (usually the master switch). The test light should
illuminate in both switch positions. Now attach the clip end of your test light to +12V constant, probe
both wires one at a time again. The light should then illuminate again only in reverse order. This
tells you that you have a "Type C" reversing polarity system. Make sure to mark which wire is lock and
unlock. Proceed to Connecting Door Locks.
Testing Switch Wire and Motor Wires
Before connecting, you must now determine which wire is the switch wire and which is the motor
wire. Cut both the lock and unlock wires in half. Start with both of the lock wires by placing
the clip end of your test light to ground, hold the door lock switch in the lock position, make
sure you are using the master switch (usually on the driver's door) and probe both lock wires
looking for voltage. The wire that illuminates the test light, mark as the switch wire, the wire
that shows no voltage, mark as the motor wire. Repeat the procedure for the unlock wire. When
connecting the lock and unlock wires to the #778 relay harness, make sure you connect the switch
wire to the RED wire or pin #87A and the motor wire to the BLUE wire or pin #30. Be sure to connect
the lock wires to the lock relay, and the unlock wires to the unlock relay, you may need to mark
these relays before you start.
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