wiring led to door locks?

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=99525
Printed Date: June 09, 2024 at 8:39 AM

Topic: wiring led to door locks?

Posted By: 12vlost
Subject: wiring led to door locks?
Date Posted: November 30, 2007 at 4:26 PM

Hi, all!!

Thanks again for my last project help,much appreciated.

I'm fitting a couple of central locking actuators and found a diagram on here which works great.

What I'd like to do is connect an LED (flashing) to tell me when the locks are activated,I looked at the "momentary to constant" relay setup and that will light the LED when I hook the "lock" (-) wire from the alarm,trouble is,how do I arrange the relays to switch it off when its un-locked?

TIA:)

Replies:

Posted By: 12vlost
Date Posted: November 30, 2007 at 4:49 PM

posted_image

Would this work?

I obviously need to connect the "lock/unlock -" wires to pin 30 on the relay third from the left,would I common these wires?

Posted By: the12volt
Date Posted: November 30, 2007 at 5:19 PM

You could, but you'd need to add diodes to the lock and unlock leads. If you are already using the diagram below, you could add another relay between terminals 30 and 85 of the left relay to break the latch. The main issue with using relays in your application will be the excessive current draw when the vehicle is not running. This could easily cause your vehicle to not start in as little as one day depending on the condition of your vehicle's battery.

posted_image

-------------
posted_image

the12volt • Support the12volt.com

Posted By: the12volt
Date Posted: November 30, 2007 at 5:26 PM

One thought that comes to mind is using a magnetic reed switch on each doorlock rod and you'd only have the draw of the LED's. This would indicate when the door(s) are locked whether you used your remote or you manually locked them. Then you could use one relay to open the circuit to the LED's when the ignition is on so it doesn't look like you're driving a stolen vehicle :)

-------------
posted_image

the12volt • Support the12volt.com

Posted By: 12vlost
Date Posted: November 30, 2007 at 5:39 PM

Stolen vehicle? posted_image

Never considered the power draw off,guess its considerable with all the relays energised?

Probaly the easiest way is to wire the LED to the ignition,so it goes off when the acc comes on?

Posted By: the12volt
Date Posted: November 30, 2007 at 5:47 PM

The ignition should provide power to the coil of the relay to open one lead of your LED's. This would prevent the LED's from coming on while you're driving with the doors locked.

85 - to ignition
86 - to ground
87 - not used
87a - to one side of LED lead
30 - to other side of LED lead

-------------
posted_image

the12volt • Support the12volt.com

Posted By: 12vlost
Date Posted: November 30, 2007 at 5:54 PM

Thanks bud...

This method will have little drain on the battery?

Posted By: the12volt
Date Posted: November 30, 2007 at 6:13 PM

The only draw you'll have when the vehicle is not running will be that of the LED's.

-------------
posted_image

the12volt • Support the12volt.com