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© 1999 Directed Electronics, Inc.Vista, CA 13
N430 9/99
Many domestically-made GM vehicles use Type A locks. However, many more GM vehicles are now Type C than in
previous years. The full-size pickups (1989-up), many of the S10 Blazers, the Corvette, '95 Cavalier/Sunfire 1993 -
and newer, Camaro/Firebird all use Type C door locks, and cannot be controlled without a 451M! Almost all domes-
tically-built Fords are Type C.Ford builds almost no Type A systems. Chrysler builds both Type A and Type C, so use
care.
IMPORTANT! Remember that functions of these wires reverse between Type A and Type B!
T
ype B
- (-) Pulses From the Switch to the Factory Relays
This system is common in many Toyota, Nissan, Honda, Saturn, as well as Ford models with a factory keyless-entry
system (some other Fords also use Type B).
The switch will have three wires on it, and one wire will test ground all the time. One wire will pulse (-) when the
switch locks the doors, and the other wire will pulse (-) when the switch unlocks the doors.This type of system is diffi-
cult to mistake for any other type.
IMPORTANT! Remember that functions of these wires reverse between Type A and Type B!