16 © 1999 Directed Electronics, Inc. Vista, CA
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 diagram below. The system must be programmed for 3.5 second door lock pulses (see Operating
Settings Learn Routine section of this guide).
Type F door locks usually require a negative pulse to unlock, and cutting of the same wire to lock the door. In
some vehicles, these are reversed. Type F door locks are found in some late-model Nissan Sentras, 240SX, and
1992 and later Nissan 300ZX. They are also found in some Mazda MPV's and some Mitsubishi's.
One relay (optional) is used to interface Type F door locks as follows:
type F: one-wire system
type E: mercedes-benz and audi (1985 & newer)
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