88 silverado 1500 w/door relay issue

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=121424
Printed Date: May 07, 2025 at 7:05 AM

Topic: 88 silverado 1500 w/door relay issue

Posted By: brainwashed2566
Subject: 88 silverado 1500 w/door relay issue
Date Posted: April 19, 2010 at 8:53 PM

I have an 1988 Chevy K1500 two door pickup with the stock power locks. I hooked up a viper 350 hv and I am now having trouble with getting the relays working. I connected the wires correctly for the 5-wire reversal but every time i give the relays power the unlock gets a full 12v hold and it stays there until I take the power off. This happen to anyone else? I have no Idea what is wrong and I am new to all this alarm stuff, any help would be greatly appreciated, thanks

Replies:

Posted By: i am an idiot
Date Posted: April 19, 2010 at 9:14 PM

Recheck the wiring of your relays. There is something not connected properly.

Posted By: brainwashed2566
Date Posted: April 23, 2010 at 3:15 PM

Ok, been busy so I only got more time to work on this today. I went back and checked all my connections, and they were correct. Checked all the wires with a meter and they are all recieving the right power. The only thing it could possibly be is faulty or incorrect relays. but i need help identifying these relays! What are the relays that are supposed to be used for this job??

Posted By: blanx218
Date Posted: April 23, 2010 at 10:29 PM

you should be using a 30/40 amp 5 pin relay and wired as follows:

1st relay pin 85 (-) unlock from alarm, pins 86, 87 to +12v, 87a to switch side of unlock wire, 30 to motor side of unlock wire.

2nd relay pin 85 (-) lock from alarm, pins 86, 87 to +12v, 87a to switch side of lock wire, 30 to motor side of lock wire

Posted By: kreg357
Date Posted: April 23, 2010 at 10:35 PM

Standard automotive SPDT relays rated at 30 amps should do it.

Wiring should be like the Type C diagram shown on page 8 of this guide: https://www.bulldogsecurity.com/pdf/RS102_112_122.pdf

This site has the wiring diagram also: https://www.the12volt.com/doorlocks/page3.asp#5w

If just plugging the +12 volt supply fuse to the relays gives a constant unlock output, it sure sounds like the unlock relay is mis-wired. The relays should be transparent and should allow normal lock operation ( pin 30 to 87a ) with no lock / unlock signal coming for the Viper unit. Did you check the unlock output from the Viper. Maybe that is the reason the unlock relay goes active when you apply power.

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Soldering is fun!

Posted By: brainwashed2566
Date Posted: April 27, 2010 at 9:04 PM

ok thanks for the help guys! i am an idiot and it did not work for two reasons/ used wrong relay and/ was using the wrong wires from the module...workin' good now. well any experience helps i guess