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The vehicle must have a vacuum actuator in each door. Make sure that locking the doors from the driver's or pas-
senger 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.
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.
This system is most commonly found in Ford, Mazda, Chrysler and GM vehicles. The door lock switch or door key
cylinder may contain either one or two resistors.
The system is most commonly found in Ford, Mazda, Chrysler and GM vehicles. The door lock switch or door key
cylinder may contain either one or two resistors.
■ 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
output leads going directly to the lock motors.
at the switch
type H: (-) multiplex system
type G: (+) multiplex system
type F: one-wire system - cut to lock, ground to unlock
type E: electrically activated vacuum systems
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