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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 lock-

ing 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 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. 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: Directly-wired reversing-polarity switches.The switches are wired directly to the motors. This type of sys-

tem 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 dri-

ver’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: 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 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.

At the switch:

• Three-wire switches will have either a constant ground input or a constant (+)12V input, along with the pulsed

lock and unlock outputs to the factory relays.

• Many BMW’s and VW’s have no external switch.The switches are inside the actuator, and instead of pulsing, the

proper wires will flip-flop from (+)12V to (-) ground as the door locks are operated.

• Direct-wired switches will have a (+) 12V constant input and one or two (-) ground inputs, along with two out-

put leads going directly to the lock motors.

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Directed Electronics 381 Series Guia de Instalação Página 8