resistor door locks, 99 alero
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=125529
Printed Date: July 17, 2025 at 4:11 PM
Topic: resistor door locks, 99 alero
Posted By: luvs2div
Subject: resistor door locks, 99 alero
Date Posted: January 07, 2011 at 11:13 PM
99 Alero takes a straight negative to lock. Takes a negative through a 1500 ohm resistor to unlock. Mars 33 Alarm/Remote start combo. Of course I tried to sneak the resistor directly in line but no dice. Since it has a neg. output only. So I used 1 single relay just on the unlock side. Lock works fine. I hit unlock and the relay clicks but no unlock. stuck a test light on the the trigger side of the relay and the relay clicked, locks unlocked... Relay is getting the signal from the brain and clicking the relay... won't unlock. I trigger the same wire with a test light/probe, works every time... ??? Please enlighten me???
Replies:
Posted By: zerepdivad
Date Posted: January 08, 2011 at 1:27 AM
how is your relay wired?
should be something like this
87- ground
86-12volts
85- negative out from unit
30- negative lock wire with resistor inline
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A DMM is a beautiful thing.
MECP Advanced Installer Certified.
Posted By: luvs2div
Date Posted: January 08, 2011 at 8:52 AM
Yes, thats the way its wired. It works fine if i trigger it any other way than the RS neg. output. Even with that, the relay clicks. Darndest thing. Installed thousands of remote starts and this baffles me a bit...
Posted By: zerepdivad
Date Posted: January 08, 2011 at 12:12 PM
the negative out from the remote start might be too weak to trigger the relay then. get maybe a smaller relay? dei 451m works great
-------------
A DMM is a beautiful thing.
MECP Advanced Installer Certified.
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