Question on wiring for Viper 791xv

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=25828
Printed Date: July 18, 2025 at 7:38 PM

Topic: Question on wiring for Viper 791xv

Posted By: dickpeter
Subject: Question on wiring for Viper 791xv
Date Posted: February 04, 2004 at 7:24 AM

Can anyone tell me what this means below?

door lock harness, 3-pin connector

BLUE (+) LOCK (-) UNLOCK OUTPUT
EMPTY NOT USED
GREEN (-) LOCK (+) UNLOCK OUTPUT

I don't underdstand the whole (+) and (-) thing.

I plan on putting this unit in a 2004 Scion Xb.

Thanks in advance.

Replies:

Posted By: mobiletoys2002
Date Posted: February 04, 2004 at 8:35 AM

the unit can do both positive pulse and negative pulse locks without adding relays! Check the lock sytem u have in your car if it is negative u would use green for lock and blue for unlock if it is positive u would wire it the oposite way!

Posted By: sroth140
Date Posted: February 04, 2004 at 3:37 PM

most alarms/remote starts cant do + locks because they take too much power for the brain to supply, so they generally supply a - pulse to drive - door locks or act as a - trigger for a relay.

SO, using blue on + systems will act as a lock trigger, and unlock on - systems. vice versa for green. many newer DEI units can do + door locks. i know the avatal 4000 is labeled + and - but it still cant drive + systems, you have to use the 451m relay, which is basically 2 relays in one.

Posted By: Teamrf
Date Posted: February 04, 2004 at 6:14 PM

It comes with a 451M but if you don't use it you can always store it in your box, and save it for a customer that may need it.

-------------
~The Rookie~
Rookie of the year that is...
Don't let the smoke out of your equiptment..it doesn't go back in.

Posted By: mobiletoys2002
Date Posted: February 04, 2004 at 6:27 PM

huh that's funny as most cars that I have seen that are positive pulse are pulsing factory relays from the switches. And a positive pulse off an alarm will activate factory relays without adding more! Im not saying all positrive pulse sytems will work but most do!
most alarms pulse a 200 ma output that is plenty to pulse relays!!