Avital systems in need of relays or not.
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=138630
Printed Date: July 19, 2025 at 8:12 AM
Topic: Avital systems in need of relays or not.
Posted By: dorin2042
Subject: Avital systems in need of relays or not.
Date Posted: March 09, 2015 at 10:23 PM
Hello all! I would like to ask in my first post a question about Avital systems or DEI in general.
I have installed a few Avitals and I've always used relays for everything, not only for polarity change, but not knowing if the unit has built in relays or not. So I wired in one relay for lock and one for unlock, relay for horn, relay for trunk pop, for AUX and so on. Since DEI does not offer any support if you're not a PRO, I choose to use relays on all the outputs.
So could you please educate me more on these systems?
Thank you.
Replies:
Posted By: howie ll
Date Posted: March 10, 2015 at 3:54 AM
Unless heavy duty starter and POS/NEG light outputs all aux and lock/unlock when 2 wire are low current NEG.
Use of relays is only needed when the particular vehicle install requires it.
Avital is the entry level for Viper etc. Often current models use previous generation Viper etc. wiring.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: dorin2042
Date Posted: March 10, 2015 at 1:12 PM
So you are saying that I don't need relays on the lock/unlock with the Avitals? I know some cars require relays but I wasn't sure if the units have built in relays or not.
Thanks
Posted By: howie ll
Date Posted: March 10, 2015 at 1:34 PM
Assuming you are going to lock "trigger" wires, usually stated by Directechs etc., you're OK Most cars have internal relays, the trigger wires equal 85 (NEG side of relay coil). If on the other hand, you're trying to control motor wires, then a relay- 5 wire method or one wire multiplex or one wire open closed, then a relay is required.
It varies according to the vehicle you're working with.
-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: dorin2042
Date Posted: March 10, 2015 at 2:21 PM
That's what I thought. I usually wire at gem modules instead of directly to the lock motor.
I thank you for your time.
Posted By: howie ll
Date Posted: March 10, 2015 at 2:23 PM
 Only important point is what does that (vehicle) wire do? Does it need a relay to operate it? ------------- Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
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