Aftermarket Door Lock

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=145472
Printed Date: May 12, 2025 at 2:54 PM

Topic: Aftermarket Door Lock

Posted By: rivraton
Subject: Aftermarket Door Lock
Date Posted: June 15, 2019 at 11:37 PM

I am installing a AVITAL 3100LX on a 2001 Dodge Ram that has an aftermarket central locking kit installed. It has a master lock motor on the Dr. side, and I need Neg. pulse to lock / unlock It looked to be easy...
(From the installation Guide):
Door Lock, 3-Pin Connector (H2)
1 GREEN (-) Lock, (+) unlock output
2 OPEN except if using 451M
3 BLUE (+) Lock, (-) unlock output
I thought a diode on each of the lock control wires (per attached image) should give neg. pulse to each wire... but I must be missing something because that didn't work.
Any suggestions?
posted_image

Replies:

Posted By: i am an idiot
Date Posted: June 16, 2019 at 6:11 AM

Use a meter to verify it grounds when you press the switch to lock or unlock. If it does, eliminate the diodes.

Posted By: catback
Date Posted: June 16, 2019 at 8:49 AM

Is that the actual layout of the central locking kit? A separated actuator, controller, switch setup? What aftermarket central locking kit is it?

Posted By: rivraton
Date Posted: June 16, 2019 at 11:56 AM

Unbranded but identical to Lanbo. Here is the full layout (I'm tying into the white and brown leads (5 &6)) posted_image

Posted By: catback
Date Posted: June 16, 2019 at 4:10 PM

Do pin 5 and 6 work as you expect? Ground 5 or 6 and the locks lock or unlock? If so and they don't work directly connected to the avital then a 451m or a pair of relays are going to be needed as the Avital output can only handle 500mA of current.

Posted By: rivraton
Date Posted: June 16, 2019 at 4:29 PM

OK, thanks for the help... I'll order a module...

ETA: It looks like I'll have to use a set of relays, a 451m will give me Pos. pulses...

Posted By: catback
Date Posted: June 16, 2019 at 7:03 PM

A 451m can be configured a variety of ways with pos or neg output

Posted By: i am an idiot
Date Posted: June 17, 2019 at 9:13 AM

Pretty sure you do not need a module. It looks like that keyless entry module is designed to use in conjunction with your alarm.

Posted By: rivraton
Date Posted: June 17, 2019 at 2:26 PM

It looks like it should...but it doesn't...

Posted By: i am an idiot
Date Posted: June 17, 2019 at 5:42 PM

Without the diodes?

Posted By: rivraton
Date Posted: June 17, 2019 at 6:14 PM

i am an idiot wrote:

Without the diodes?

Tried it both ways, it does not work... If it is supposed to, as you seem to be certain, then I must have a defective alarm controller... I won't condemn it until I try the 451m

Posted By: rivraton
Date Posted: June 20, 2019 at 4:27 PM

I just dropped back to update on this... I got a 451m and wired it for neg pulses and it works :^: One side note if you need to go this route, insulate or isolate the white/black and brown/black leads at the outset... If they make contact, it will reverse the lock / unlock signals :oops: This was happening intermittently when the harness was moved
Thanks to all for the guidance.