2021 Hyundai Kona, Door Lock Problems
Printed From: the12volt.comForum 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=148453
Printed Date: January 07, 2026 at 1:34 AM
Topic: 2021 Hyundai Kona, Door Lock Problems
Posted By: c0ryp1
Subject: 2021 Hyundai Kona, Door Lock Problems
Date Posted: December 16, 2025 at 3:04 PM
hi there im trying to get my doors to unlock while remote started. I tapped into my actuator and wired up a 2 relay reversal tapping into the actuator feed. however while i can hear the motor in the door move its still too slow or something and doesnt give enough force to pull the cables that unlock and lock.
i have 10gauge coming from battery directly into cabin (fused at 50a at battery) then from there fused at 20a into here https://www.the12volt.com/relays/relaydiagram49.html and finally into pins 6/7 with 18 gauge(matches oem wiring) of the doors connector.
but still no unlock or lock
i have 10gauge coming from battery directly into cabin (fused at 50a at battery) then from there fused at 20a into here https://www.the12volt.com/relays/relaydiagram49.html and finally into pins 6/7 with 18 gauge(matches oem wiring) of the doors connector.
but still no unlock or lockReplies:
Posted By: lee.lopez
Date Posted: December 17, 2025 at 2:28 PM
If your remote start has lock outputs, why don't you just use the trigger wires? Gray lock/ green unlock
Posted By: c0ryp1
Date Posted: December 17, 2025 at 2:51 PM
the main brain was fused at 15a and it was popping fuses and the relays in the brain were 20a so i didnt want to up the fuses i also think the brain does not put out the correct square wave to trigger a unlock/lock event i think it was I/P-C connector pins 21/22 that had the unlock and lock signal and could not get that going that way, i am thinking now after looking closer at this 
originally read that the konas were one wire lock but i think bcm is stealing current and need to do this. however this will only be the drivers door and i want the passenger door to unlock as well that way i dont have to get in first to let passengers in so i was thinking now not using the internal relays of the brain but adding
2 additional relays in each door to break the bcm connection.
havent got outside yet but i was thinking.
both relays pin 85 to ground.
relay A and relay B pins 30 to respective side of motor wires A/B
then pins 87A to the bcm side of their respective wires A/B
(this maintains oem connections basically the same as the above diagram)
and then pins 87 will be fed by the polarity reversal pair i have already wired up.
here's where my thinking could be flawed.
pins 86 on both the "bcm - brain takeover circut" are fed by the lock and unlock wires paired from the brain protected by a 1n4001 diode to prevet a back feed into the brain. this waay during any lock event from the brain it breaks bcm and hands to brain.
this is where it gets tricky but i still believe a couple of diodes off of the lines where i tap into the lock and unlock lines to feed the polarity reversal circut would fix it but im not 100% sure i would have a back feed issue anyways as long as i tapped the line befor the diode that i alreaady used to prevent backfeeding.
originally read that the konas were one wire lock but i think bcm is stealing current and need to do this. however this will only be the drivers door and i want the passenger door to unlock as well that way i dont have to get in first to let passengers in so i was thinking now not using the internal relays of the brain but adding
2 additional relays in each door to break the bcm connection.
havent got outside yet but i was thinking.
both relays pin 85 to ground.
relay A and relay B pins 30 to respective side of motor wires A/B
then pins 87A to the bcm side of their respective wires A/B
(this maintains oem connections basically the same as the above diagram)
and then pins 87 will be fed by the polarity reversal pair i have already wired up.
here's where my thinking could be flawed.
pins 86 on both the "bcm - brain takeover circut" are fed by the lock and unlock wires paired from the brain protected by a 1n4001 diode to prevet a back feed into the brain. this waay during any lock event from the brain it breaks bcm and hands to brain.
this is where it gets tricky but i still believe a couple of diodes off of the lines where i tap into the lock and unlock lines to feed the polarity reversal circut would fix it but im not 100% sure i would have a back feed issue anyways as long as i tapped the line befor the diode that i alreaady used to prevent backfeeding.