How to test a brain?
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=38298
Printed Date: July 17, 2025 at 12:37 PM
Topic: How to test a brain?
Posted By: fugit
Subject: How to test a brain?
Date Posted: August 29, 2004 at 7:59 PM
I have a viper 560xv that I think may be bad. I posted a while back that I couldn't get my RS to work for crap (Thank you to all who tried to help) but it worked partially once the first time I tried it, but never again. Tried grounding the trigger wire and it would crank, but never start. Now, the siren will work intermittenly. I first thought it was a loose connection but I moved the wires and it makes no difference , sometimes it works and sometimes it doesn't. I soldered all my connections, and made sure they were tight. there are no places that motion could've changed this (and I checked). Today what made me wonder if the brain is crappy is that I went to the movies and when I armed it no chirp. when I disarmed after the show, chirped fine. I've even tried setting it off when it doesn't chirp and get nothing when it's been triggered. Just the lights and starter kill. So I'm wondering if it's not something in the brain. Any input?
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"I'm Rick James bi***, enjoy yo' self Ah Ah Ah"
Dave Chappelle as Rick James
Replies:
Posted By: JWorm
Date Posted: August 29, 2004 at 8:09 PM
I can't remember the last time I saw a defective DEI brain. I would guess its installation related....probably a bad/loose ground wire.
Posted By: fugit
Date Posted: August 29, 2004 at 8:38 PM
I checked the ground and it's solid and in a cherry spot, no paint. Everything else works fine. I have two 530t's to all the windows and they work perfect everytime. ------------- "I'm Rick James bi***, enjoy yo' self Ah Ah Ah"
Dave Chappelle as Rick James
Posted By: auex
Date Posted: August 29, 2004 at 8:46 PM
First thought would be ground. I have seen dei brains go bad, not very often. Could the siren have gotten wet at any time in the last couple days? Also is the siren going through a grommet to get through the firewall?
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Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.
I've been sick lately, sorry I won't be on much.
Posted By: swamprat323
Date Posted: August 29, 2004 at 9:08 PM
Try and put your siren direct to a power supply ( bench test type)if u have one, if not go direct to the battery. that tell ya if the siren is good or bad. but make sure u put the ground to the battey also.
Posted By: flynntech
Date Posted: August 29, 2004 at 9:37 PM
Multimeter
Posted By: kgerry
Date Posted: August 30, 2004 at 1:18 PM
best/only way to test the circuitry in and out of the brain unit would be with a meter (DMM)... as has been said already..in the 5 years or so i've been a DEI dealer, i've never had a bum brain unit....
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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: fugit
Date Posted: August 30, 2004 at 5:54 PM
Sweet I'll try all those, plus I just had my alternator take a dump so that could have something to do with it. I'll test the siren, it has been raining and I never thought of the water. (duh) Thanks for the input, I'll post up any new info.
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"I'm Rick James bi***, enjoy yo' self Ah Ah Ah"
Dave Chappelle as Rick James
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