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Type E: Electrically-activated vacuum systems
Type E 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 (+)12 volt 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.
Type F: One-wire system - cut to lock, ground to unlock
Type F door locks usually require a negative pulse to unlock and cutting the wire to lock the door. In some
vehicles, these functions are reversed. Type F door locks are found in late-model Hyundai, Nissan Sentras,
some Nissan 240SX, and Nissan 300ZX 1992-up. They are also found in some Mazda MPV's and some
Mitsubishi's.
One relay (not included) is used to interface to this type of system as follows:
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