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1995 and newer vehicle anti-theft sys-
tems (immobilizers)
1995 and newer vehicle anti-theft systems (immobilizers) require a bypass module. The bypass mod-
ule allows for easy interfacing, while still maintaining the OEM system’s integrity.
passlock I and passlock II (PL-1 and PL-2)
The Passlock I and Passlock II systems can be found in the following General Motors vehicles:
● ‘95 and newer Cavalier and Sunfire
● ‘96 and newer Achieva, Grand Am, and Skylark
● ‘97 and newer Intrigue, Malibu, and Cutlass
● ‘98 and newer trucks, vans, SUVs
● ‘99 and newer Alero
● 2000 and newer Impala and Saturn
Passlock I and II systems are VATS-evolved. Passlock systems still rely on the R-code to start, but the
pellet is no longer placed in the key. The resistor can now be found in the key switch. This allows for
a greater number of possible R-codes. In addition, Passlock systems require “seeing” the correct R-
code at the correct time. To bypass Passlock I and II, p/n 555L is required.
passkey III (PK-3), transponder-based systems
The Passkey III system can be found in the following vehicles:
● ‘97 and newer Park Avenue
● ‘98 and newer Cadillac
● ‘99 and newer U vans, Transport, Montana, and Silhouette
● 2000 and newer Grand Prix, Lesabre, Monte Carlo, Lumina, Bonneville
● 2001 and newer Aurora, Aztek and Rendezvous
Other transponder-based systems include: Acura, BMW, Dodge/Chrysler/Jeep, Ford, Honda,
Infinity, Mazda, Mercedes, Mitsubishi, Nissan, Toyota, Volkswagon, and Volvo.
PK-3 and the transponder-based systems use a transponder system that locks out the ignition and fuel
system. This transponder system is comprised of two parts. The first part, the transceiver, circles the
key switch and is activated when the key is placed in the key switch or turned to the run position.
Upon activation, the transceiver will excite the transponder, which is located (but not visible) in the
head of the ignition key. The key transponder will then send a unique code back to the transceiver
for evaluation. If the code matches a valid code of the system, the vehicle will be allowed to start.
Most of these transponder-based systems can be bypassed using p/n 555U. Some may require addi-
tional parts from the vehicle manufacturer. Consult you dealer for the applications. For most Ford
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