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door lock harness wire connection guide
identifying the door lock system
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.
N N o o t t e e : : Always retest the kick panel wires to make sure they work the same as the wires on the switch.
There are six different types of common door lock circuits (some vehicles use more unusual systems):
Type A - Three-wire (+) pulse controlling factory lock relays. This system is most commonly found
in GM, some Ford and Chrysler, 1995 Saturn, some newer VW, and newer BMW.
Type B - Three-wire (-) pulse controlling factory lock relays. This system is found in 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 door lock system has no factory relays. This system is most commonly found most Fords,
many GM two-door cars and trucks, and 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 are having actuators added. All Saab before 1994, all Volvo except
850i, all Subaru, most Isuzu, and many Mazda. Some mid-eighties Nissans, pre-1985 Mercedes-
Benz and Audi.
Type E - The vehicle must have an electrically activated vacuum system 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 the late-model
Nissan Sentra, some Nissan 240SX, and Nissan 300ZX 1992-up. It is also found in older
Mitsubishi, and some early Mazda MPV's.
Type G - Positive (+) multiplex. A resistor interface module may be used for this type of door locking
system. This system is found in the 2001 and newer GM Aztek.
Type H - Negative (-) multiplex. A resistor interface module may be used for this type of door
locking system. This system is found in 1999 and newer Grand Am and Alero models, as well as
2000 and new Impala and Monte Carlo models.
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