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the switch wires to be used, you can usually simplify the instal-
lation 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 vehi-
cles use more unusual systems):
■ T T y y p p e e A A : :
Three-wire (+) pulse controlling factory lock relays.
Most GM, some Ford and Chrysler, 1995 Saturn, some new
VW, newer BMW.
■ T T y y p p e e B B : :
Most Asian vehicles, early Saturn, some BMW and Porsche.
■ T T y y p p e e C C : :
Direct-wired reversing-polarity switches. The switch-
es 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.
■ T T y y p p e e D D : :
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 pre-1997
Subarus, most Isuzus, and many Mazdas. Some mid-eighties
Nissans, pre-1985 Mercedes-Benz and Audi.
■ T T y y p p e e E E : :
must have a vacuum actuator in each door. Make sure that lock-
14
Three-wire (-) pulse controlling factory lock relays.
Adding one or more aftermarket actuators. These
Electrically-activated vacuum systems. The vehicle
© 2006 directed electronics.
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