door lock relays just buzz

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=102678
Printed Date: July 14, 2025 at 4:29 PM

Topic: door lock relays just buzz

Posted By: hobolurkin
Subject: door lock relays just buzz
Date Posted: March 01, 2008 at 1:20 AM

Hello,

My first post - let me say I have gotten a lot of great info from this site - thanks to everyone who contributes!

I recently installed a remote start/alarm/keyless entry-combo and got all of the features, except for the door locks, to work on the first try.

I used the 5 Wire Alternating 12 Volts Positive Door Locks diagram to connect it up. On the first try, the (un)lock functions from the alarm and the interior (un)lock buttons were reversed - I obviously messed up somewhere, so I removed all the connections from the relays and put them back as shown above.

I replaced them and verified the connections, only to have the relay make a nasty buzzing noise when the alarm triggers go, like the coil is freaking out. I tested the relay by removing everything except the (+) wires and alarm trigger (-) wires and the relay goes back to normal clicking.

When I reconnect the door lock wires, the interior lock buttons work fine, but I'm back to the freaking out of the relays and my CEL amd random dash lights illuminating when the alarm triggers kick in.

Any ideas? I'm getting kind of bleary-eyed but to my thinking, the fact that it functioned at all, albeit unlocking when it should have locked and vice versa, means that there should be a way this would work properly.

Any ideas? Thanks in advance for any suggestions.
hobolurkin

Replies:

Posted By: hobolurkin
Date Posted: March 01, 2008 at 3:27 AM

I forgot to mention that the vehicle is a 1993 Ford Explorer.

Thanks!

Posted By: prdjr165
Date Posted: March 01, 2008 at 4:34 AM

did you test your door lock wires to be sure that they are reverse polarity and not (-)trigger,I seen that explorers that came with keyless entry have (-)trigger locks.

Posted By: howie ll
Date Posted: March 01, 2008 at 7:48 AM

Just checked with diretechs, the last poster is correct in that if the vehicle originally had factory keyless entry, your door lock colours will be the same but they are neg switching, if not go the extra yard and 5 wire (which is actually relay interrupt) connect to the motor leads coming from the DRIVER'S door motor.

Posted By: KarTuneMan
Date Posted: March 01, 2008 at 10:57 AM

LOCK

Pink / YELLOW

In driver's kickpanel

Rev Pol

If vehicle is equipped with keyless entry, the doorlocks are negative trigger.

UNLOCK

Pink/green

In driver's kickpanel

Rev Pol

If vehicle is equipped with keyless entry, the doorlocks are negative trigger.

Always read the fine print!

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