Reversing polarity on k9-Five alarm

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=33976
Printed Date: July 19, 2025 at 2:16 AM

Topic: Reversing polarity on k9-Five alarm

Posted By: Mx3-freak
Subject: Reversing polarity on k9-Five alarm
Date Posted: June 16, 2004 at 12:56 AM

Hey, I have a k9-alarm installed on my car, and just rrcently got the transmittter for it to work (was in valet mode for about 1 year). After programming, the alarm works perfectly except one rather large detail; when disarming, it locks the car instead of unlocking it. Thus, the alarm goes into dis-armed state, but instead of trying to open the locks, you can hear it try to re-lock the already locked doors. I know the internals are working properly as well as the actuator because I reverse the plug connection into the brain and all the alarm does is unlock; even when you press arm.

So are there any suggestions that will make this alarm change polarity correctly? Or am I in a hopeless situation? Once again, its a k9-Five alarm.

Thanks,
Frank

Replies:

Posted By: catch22
Date Posted: June 16, 2004 at 11:20 AM

Let me see if I understand, when you arm the car your doors lock & when you disarm the car the doors also lock?

What kind of car/year is it?

If it is an import, most will be negative trigger door locks, so just verify the correct wires have been hooked up.

Most domestics are either positive trigger or reverse polarity (unless it has a keyless entry/factory alarm), either case would require the use of relay because the K9 provides a negative output on the door locks triggers. Trace the wires back to the relays and verify the correct wires were used and if the relays were wired for the correct application.

Either case, look up your car for wiring info on this site.

Posted By: Mx3-freak
Date Posted: June 16, 2004 at 4:43 PM

The car is a 1995 Mazda Mx-3 RS. However, it did not come with the power package, and does not have "power" door locks. The only thing the actuators (both aftermarket and supplied by Omega) are hooked to is the K-9 alarm.

Ok, now I'm going to sound like the big auto electrical noob I am...

Would this type of set-up have relays outside, inside, or both inside and outside the brain? If only inside, is there a way to check for a faulty relay. Or to replace it??

Sorry for the dumb questions; I'm a mechanical guy, not electrical.

Any info or links will help geatly.

Thanks,
Frank

Posted By: catch22
Date Posted: June 17, 2004 at 1:19 PM

What you have by adding door actuators is a reverse-polarity system. There should be two relays external of the K9 alarm brain. I would trace the door lock/unlock output from the brain to the relays, then test relays and make sure the wires are on correct relay pins.

Forgive me if I am stating the obivious, basically a door actuator (2 wire type) works the same as a power window motor. Two wires, when one wire has positve voltage & the other wire is grounded the actuator moves in one direction. To get the actuator to move in the opposite direction you switch the power and ground on the subsequent wires. For example say the door lock actuator has two wires, green & blue. When I put postive voltage on the green wire & ground the blue wire, the actuator locks the door. Then to unlock, I would put positive voltage on the blue wire & ground the green wire. This is what the relays accomplish. There are pictures of different relay configurations under the basics's section. Here is what your should be:

posted_image

Pin 30, goes to the actuator, using my example from above, I would take the green wire from the driver's door, combine it with the green wire from the passenger's door and connect them both to Pin 30 on the left relay. I would do the same thing with the blue wires from each door and connect them to pin30 of the relay on the right.

Once you have found the relays in your car, verify what the wires connected are. Test the operation of each door actuator, individually, by applying a positive & ground on the actuator wires. Match the wires up for each door, so you know through testing them, that they will either both lock or unlock together. Do not rely on just matching the wire colors, match them up through testing. Also the operation of relay is explained the Basic section, it will give you a better understanding of how one works.

Good luck & post your results..