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28 © 1999 Directed Electronics, Inc. Vista, CA
These door locks are controlled by an electrically activated vacuum pump. Some Mercedes and Audis use a Type
D system. Test by locking doors from the passenger key cylinder. If all the doors lock, the vehicle's door lock
system can be controlled with just two relays (optional). The control wire can be found in either kick panel and
will show (+)12V when doors are unlocked and (-) ground when doors are locked.
To interface, see the diagram below. The system must be programmed for 3.5 second door lock pulses. (See
Operation Settings Learn Routine section of this guide.)
This system usually requires a negative pulse to unlock, and cutting the wire to lock the door. In some vehicles,
these are reversed. It is found in late-model Nissan Sentras, some Nissan 240SX, and Nissan 300ZX 1992 and later.
This system is also found in some Mazda MPV's and some Mitsubishi's. One relay (optional) is used to interface
to this type of system as follows:
type F: one-wire system
type E: mercedes-benz and audi (1985 and newer)