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type E: mercedes-benz and audi (1985 & newer)
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 up to 1993 and 1 second pulse 1994 or newer.
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