Sorry if this is repetitive, but I have zero experience in wiring auto electronics, except my AM JAM from 25 years ago. I have a GMC Yukon 2000 which uses a 3 wire positive pulse system for the door locks. What voltage from the pulse is required to trigger the unlock/lock switch? I am working on a contraption which needs to hookup to the lock/unlock relay, send a pulse trigger to the relay to unlock the doors. Sorry for the rookie question. I have searched through this site and a lot of it is greek to me. Thanks for the help.
Power Lock wire color... ....... lt. blue polarity + location...pin A4, brown plug at BCM
Power Unlock wire color.... white polarity + location... pin A3, brown plug at BCM
The BCM (Body Control Module) is located behind the driver side of the dash. The plugs face towards the rear of the vehicle.
Now as far as your question it makes no sense. What do you mean by "trigger the unlock/lock switch?" And what is this "contraption" you are hooking up? Perhaps if we knew what you were doing we could be of more help.
If you are simply asking what pulse polarity you need to operate the doorlocks the answer is is positive 12volts.
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