Door lock relays

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=14385
Printed Date: May 29, 2025 at 8:12 PM

Topic: Door lock relays

Posted By: codywatkins
Subject: Door lock relays
Date Posted: June 03, 2003 at 12:33 AM

Hi all,

What kind of relays should I use for adding power door locks to my car (and hook them into my alarm system).

My alarm has a "Lock -" output and "Unlock -" output. But using a multimeter I discovered that:
1) At rest both outputs are at 0.11 volts.
2) When active the outputs will go to 0.61 volts.

Now will this kind of relay work for me ? https://cgi.ebay.com/dll?ViewItem&item=3014631007&category=14934&rd=1 (if these wont work what are the specs of the relays I should be using??).

And will this diagram work for me? https://www.velocitymotorsport.com/images/install_notes/104.jpg

Is 0.6 volts enough to trigger the relay coil. And will the 0.11 volts (at rest) trigger the relays too even though they shouldn't ??

Thanks in advance!
Cody

Replies:

Posted By: auex
Date Posted: June 03, 2003 at 9:18 AM

Pretty much if those voltage outputs are correct then your alarm is toast. More then likely you didn't get an accurate measurement. Here is a relay diagram for adding actuators.
posted_image

-------------
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: codywatkins
Date Posted: June 03, 2003 at 11:10 AM

The 2 "unlock -" and "lock - " outputs are togeather in some kind of male plug. I think i am supposed to buy an optional "door lock module" that plugs in. But i thought I could wire relays up to the two outputs myself.

What voltage is required to trigger relays?

Posted By: mm99
Date Posted: June 16, 2003 at 11:05 PM

i am curious about the digital multimeter you were using....if it is like mine....(not the cheapest you can find that is), it has a zero key....just like you would "tare" a scale, you can tare a multimeter....i know i often have to do that when my batteries are low or right after i replace them.....on to your voltage readings..... my alarm system is the Hornet 544t made by DEI....it's readings were .50 volts when activated .00 when not....and it has both the lock and unlock wires....the similarities on the readings (the .11+/- difference is probably the multimeter, or as auex said, your alarm may be toast)....the diagram shown below should be what you should use....

posted_image