must have a vacuum actuator in each door. Make sure that lock- ing 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 common- ly found in Ford, Mazda, Chrysler and GM vehicles. The door lock switch or door key cylinder may contain either one or two resistors.
■Type H: Negative (-) multiplex. The system is most common- ly found in Ford, Mazda, Chrysler and GM vehicles. The door lock switch or door key cylinder may contain either one or two resistors.
at the door lock 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 switch- es 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
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