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© 2000 Directed Electronics, Inc. Vista, CA
relay harness (H2) wire connection guide
The system has door lock relays on-board, and can directly interface with most electric power door lock systems
drawing 30 amps or less. It can also drive aftermarket actuators directly. (Some vehicles require that an after-
market actuator be added to the driver’s door to allow system control, see
Type D
wiring section).
The easiest way to determine which type of door lock system you are working with is to remove the master locking
switch itself, which is usually on the driver’s door or on the center console. Once you have determined which type
of factory door lock circuit you are working with, and the color codes of the switch wires to be used, you can
usually simplify the installation by locating the same wires in the vehicle’s kick panel. If no central locking switch
is found, the installation may require a door lock actuator.
NOTE:
Always retest the wires in the kick panel to be sure they function the same way as the wires
on the switch.
There are eight common types of door lock circuits (some vehicles use more unusual systems):
■
Type A:
Three-wire (+) pulse controlling factory lock relays. Most GM, some Ford and Chrysler, 1995 Saturn,
some new VW, newer BMW.
■
Type B:
Three-wire (-) pulse controlling factory lock relays. Most Asian vehicles, early Saturn, some BMW and
Porsche.
■
Type C:
Direct-wired reversing-polarity switches. The switches are wired directly to the motors. This type of
system has no factory relays. Most Fords, many GM two-doors cars and trucks, many Chryslers.
■
Type D:
Adding one or more aftermarket actuators. These include slave systems without an actuator in the
driver’s door, but with factory actuators in all the other doors. Type D also includes cars without power locks,
which will have actuators added. All Saabs before 1994, all Volvo except 850i, all Subaru, most Isuzu, and
many Mazdas. Some mid-eighties Nissans, pre-1985 Mercedes-Benz and Audi.
■
Type E:
Electrically-activated vacuum systems. The vehicle must have a vacuum actuator in each door. Make
sure that locking the doors from the driver's or passenger side using the key activates all the actuators in the
vehicle. This requires a slight modification to the door lock harness. Mercedes-Benz and Audi 1985 and newer.
■
Type F:
One-wire system - cut to lock, ground to unlock. This system is found in late-model Nissan Sentras,
some Nissan 240SX, and Nissan 300ZX 1992 and later. It is also found in older Mitsubishis, and some early
Mazda MPV’s.
■
Type G:
Positive (+) multiplex. This system is most commonly found in Ford, Mazda, Chrysler and GM vehi-
cles. The door lock switch or door key cylinder may contain either one or two resistors.
■
Type H:
Negative (-) multiplex. The system is most commonly found in Ford, Mazda, Chrysler and GM vehi-
cles. The door lock switch or door key cylinder may contain either one or two resistors.
identifying the door lock system
